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2020年
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Record 1 of 333
Title: Ultra-compact on-chip optical filters with narrow bandwidth
Author(s): Li, W (Li, Wei); Zhang, LX (Zhang, Lingxuan); Sun, QB (Sun, Qibing); Zeng, C (Zeng, Chao); Li, XY (Li, Xingyi); Fan, WC (Fan, Weichen); Lei, HP (Lei, Huiping); Wu, W (Wu, Wei); Wang, GX (Wang, Guoxi)
Source: MODERN PHYSICS LETTERS B  Volume: 34  Issue: 22  Article Number: 2050232  DOI: 10.1142/S0217984920502322  Published: AUG 10 2020  
Abstract: A novel scheme for integrated optical filters with narrow bandwidth is proposed to dramatically improve its compactness on the basis of slow-light waveguide, which provides a large optical path in a short geometry length. By introducing the one-dimensional grating waveguide (ODGW), a kind of slow-light waveguide, into a micro-ring resonator (MRR), the area of MRR is reduced by three orders of magnitude compared to the MRR without ODGW. As a proof of concept, an ultra-compact on-chip filter with narrow bandwidth of 2.1 pm (263 MHz) is conceived by cascading six MRRs with ODGW. Additionally, the designed optical filter shows excellent performances of roll-down speed, out-of-band signal suppression, and in-band ripple. Our proposal offers a promising solution to miniaturize the integrated optical filters with narrow bandwidth, and hence improve the integration density of on-chip photonic networks.
Accession Number: WOS:000562050400011
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Wu, Wei    0000-0002-5975-0426 
ISSN: 0217-9849
eISSN: 1793-6640

Record 2 of 333
Title: Experimental Investigation of Power-Scaled Dissipative Soliton Generation
Author(s): Lv, ZG (Lv, Zhiguo); Yang, Z (Yang, Zhi); Li, F (Li, Feng); Li, QL (Li, Qianglong); Yang, XJ (Yang, Xiaojun); Wang, YS (Wang, Yishan); Zhao, W (Zhao, Wei)
Source: FRONTIERS IN PHYSICS  Volume: 8  Article Number: 48  DOI: 10.3389/fphy.2020.00048  Published: MAR 20 2020  
Abstract: We conduct a power scaling study for the femtosecond dissipative soliton generation with a 10-mu m core diameter, fiber-based, compact-sized, and low-cost all-normal-dispersion laser configuration. Laser performance, in terms of spectra distribution, temporal characteristic, average power, and stability in 8 h, for different filtering bandwidths has been, respectively, investigated. In the experiment, the obtainable highest output power and shortest pulse duration are 4.5 W and 85 fs, respectively. To our best knowledge, this is the shortest pulse duration among the reported all-fiber pumped Watt-level mode-locked fiber lasers.
Accession Number: WOS:000525684200001
ISSN: 2296-424X

Record 3 of 333
Title: 3D Imaging Restoration of Spinning-Disk Confocal Microscopy Via Deep Learning
Author(s): Bai, C (Bai, Chen); Yu, XH (Yu, Xianghua); Peng, T (Peng, Tong); Liu, C (Liu, Chao); Min, JW (Min, Junwei); Dan, D (Dan, Dan); Yao, BL (Yao, Baoli)
Source: IEEE PHOTONICS TECHNOLOGY LETTERS  Volume: 32  Issue: 18  Pages: 1131-1134  DOI: 10.1109/LPT.2020.3014317  Published: SEP 15 2020  
Abstract: Due to the multipoint excitation and simultaneous detection strategy applied, spinning-disk confocal microscopy (SDCM) results in an increased imaging speed compared to conventional confocal microscopy. Additionally, the super-resolution radial fluctuations (SRRF) approach can further improve the imaging resolution of SDCM in 3D imaging at the cost of imaging time due to the large amounts of data acquisition and the increased risk of photo-bleaching and photo-toxicity due to the multiple excitations. Here, we propose a deep learning-based method for 3D SDCM, where the neighboring pixels in z-scanning slices are taken into account for 3D reconstruction. Consequently, high-quality imaging slices can be reconstructed directly from the SDCM stacks with a single scan. The image quality achievable with this SRRF-Deep method is comparable with the SRRF method, whereas it achieves image reconstruction about 30 times faster using 100 times fewer images. Thus, practicality of the SDCM system can be significantly improved in 3D imaging.
Accession Number: WOS:000595143900002
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Yao, Baoli  AAB-4606-2021   
Yu, Xianghua    0000-0002-7447-1396 
Peng, Tong    0000-0003-0373-5136 
ISSN: 1041-1135
eISSN: 1941-0174

Record 4 of 333
Title: Dynamic surface parameter analysis for frequency response of tip/tilt mirror
Author(s): Xu, GZ (Xu, Guangzhou)
Source: OPTIK  Volume: 203  Article Number: 163964  DOI: 10.1016/j.ijleo.2019.163964  Published: FEB 2020  
Abstract: The tip/tilt mirror performs controllable high-speed swing to stabilize the imaging beam and compensate for the external micro-vibration for optical telescope. The calculation of surface parameter under dynamic driven frequency is the design foundation of tip/tilt mirror. To resolve the dynamic surface parameter calculation problem, the frequency response analysis of tip/tilt mirror is carried out; the discrete error and elimination method of optical surface for tip/tilt mirror is proposed as well to improve the surface calculation precision of tip/tilt mirror; the optomechanical simulation technology is selected to process the dynamic surface change data of tip/tilt mirror and it has been proved the effectiveness to obtain the dynamic surface parameter of tip/tilt mirror. The calculation results demonstrate the nonlinear change rule between the surface change parameter and the driven frequency; the surface change is not obvious under the lower micro-vibration driven frequency, but is obvious under the higher driven frequency; the microvibration frequency and environmental adaption of tip/tilt mirror are determined based on the dynamic surface parameter simulation results. The research of dynamic surface parameter for frequency response of tip/tilt mirror provides a new technical reference for the dynamic surface simulation and structural design of tip/tilt mirror.
Accession Number: WOS:000545594000056
ISSN: 0030-4026
eISSN: 1618-1336

Record 5 of 333
Title: Polarization-dependent micro-structure fabrication with direct femtosecond laser writing on plastic polarizer films
Author(s): Yu, XH (Yu, Xianghua); Liu, C (Liu, Chao); Lei, M (Lei, Ming); Yan, SH (Yan, Shaohui); Peng, T (Peng, Tong); Dan, D (Dan, Dan); Yao, BL (Yao, Baoli)
Source: OPTICS LETTERS  Volume: 45  Issue: 9  Pages: 2588-2591  DOI: 10.1364/OL.390349  Published: MAY 1 2020  
Abstract: Iodine-doped polyvinyl alcohol (IDPVA) film has been widely used as a plastic polarizer due to its great linear dichroism. We found that the anisotropic character of the plastic polarizer can be permanently damaged upon exposure of high intensity femtosecond laser pulses. This process is a two-photon-induced chemical reaction and denominated as two-photon-induced isotropy (TPII). The TPII effect can form a high polarization contrast on the base of the original IDPVA films. With this property, polarization-sensitive diffractive optical elements are fabricated in IDPVA films. The low cost of the IDPVA film and the high polarization contrast of TPII make it a promising new candidate for femtosecond laser fabrication of polarization-selective optical elements. (C) 2020 Optical Society of America
Accession Number: WOS:000535919200031
PubMed ID: 32356823
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Yao, Baoli  AAB-4606-2021   
Peng, Tong    0000-0003-0373-5136 
Yu, Xianghua    0000-0002-7447-1396 
ISSN: 0146-9592
eISSN: 1539-4794

Record 6 of 333
Title: Lasercom optical-terminal performance testing platform
Author(s): Li, J (Li, Jing); Xue, X (Xue, Xun); Wang, ZF (Wang, Zhengfeng); Liu, K (Liu, Kai); Zhou, Y (Zhou, Yan); Zhao, JK (Zhao, Jianke)
Source: OPTIK  Volume: 224  Article Number: 165521  DOI: 10.1016/j.ijleo.2020.165521  Published: DEC 2020  
Abstract: The lasercom optical-terminal performance testing platform (LCOT-PTP) is a precision optical system providing experimental testing of important characteristic parameters including transmitting power, beam divergence angle, far-field spot energy distribution and coaxialities of different branches in a lasercom optical terminal (LCOT). The LCOT-PTP consisting of a telescope, beam splitters, a receiving branch, a transmitting branch and a tracking test branch is developed. Due to the testing process requirements in coarse tracking, fine tracking and the assembly integration, the working wavelengths of 808nm, 1550nm and 632.8nm are adopted in testing-system design. By using the under-test LCOT parameters and Gaussian beam transmitting theory, the optical-system design is completed. Based on the established LCOT-PTP, the key performance testing work is accomplished.
Accession Number: WOS:000599257500008
ISSN: 0030-4026
eISSN: 1618-1336

Record 7 of 333
Title: Optical design and fabrication of an all-aluminum unobscured two-mirror freeform imaging telescope
Author(s): Xie, YJ (Xie, Yongjun); Mao, XL (Mao, Xianglong); Li, JP (Li, Jinpeng); Wang, FB (Wang, Fengbiao); Wang, P (Wang, Peng); Gao, R (Gao, Rong); Li, X (Li, Xing); Ren, SJ (Ren, Shangjie); Xu, ZC (Xu, Zhichen); Dong, RG (Dong, Rongguang)
Source: APPLIED OPTICS  Volume: 59  Issue: 3  Pages: 833-840  DOI: 10.1364/AO.379324  Published: JAN 20 2020  
Abstract: Freeform optics offers more degrees of freedom to optical design that can benefit from a compact package size and a large field of view for imaging systems. Motivated by the advances in modern optical fabrication and metrology, freeform optics has been found in many applications. In this paper, we will describe the challenging optical design, fabrication, metrology, and assembly of an all-aluminum unobscured two-mirror freeform imaging telescope. The telescope has a large field of view of 20 degrees x 15 degrees. The freeform aluminum mirrors are manufactured by diamond turning based on a feedback modification strategy. The freeform mirrors are measured by a computer-generated hologram-based interferometric null test method. All-aluminum configuration has the advantages of being athermal and cost-effective. (C) 2020 Optical Society of America
Accession Number: WOS:000517833200037
PubMed ID: 32225215
ISSN: 1559-128X
eISSN: 2155-3165

Record 8 of 333
Title: High-energy femtosecond laser system based on a fiber laser seeder, Yb:YAG single crystal fiber and chirped volume Bragg grating
Author(s): Li, F (Li, Feng); Wang, NN (Wang, Nana); Yang, Z (Yang, Zhi); Lv, ZG (Lv, Zhiguo); Yang, Y (Yang, Yang); Li, QL (Li, Qianglong); Yang, XJ (Yang, Xiaojun); Wang, YS (Wang, Yishan); Zhao, W (Zhao, Wei)
Source: LASER PHYSICS LETTERS  Volume: 17  Issue: 6  Article Number: 065103  DOI: 10.1088/1612-202X/ab86b2  Published: JUN 2020  
Abstract: A high-energy chirped pulse amplification system based on a Yb doped fiber seeder, two-stage single crystal fiber (SCF) amplifier with a simple single-pass structure is demonstrated in this work. An amplified power of 52.2 W with a beam quality of less than 1.3 at 200 kHz is obtained, to our best knowledge, this is the highest power obtained with a single-pass amplification structure of the SCF with the energy of hundreds of microjoules. An excellent power stability of 0.32% is obtained. Dispersion between the chirped fiber Bragg grating (CFBG) stretcher and the chirped volume Bragg grating compressor is matched via the use of a self-made temperature tuning device of CFBG. As a result, a pulse duration of 740 fs and a compressed power of 31.4 W are obtained at a repetition rate of 200 kHz. In order to assess the influence of pulse duration induced by the nonlinearity during the amplification and increase the output pulse energy,the repetition rate of the self-made fiber seeder is changed to 100 kHz. A compressed power of 28.4 W and a pulse width of 858 fs are obtained, corresponding to a pulse energy of 284 mu J and a peak power of 331 MW. This compact and high-energy femtosecond laser system will find various applications in both scientific research and industrial implementation.
Accession Number: WOS:000534271600001
ISSN: 1612-2011
eISSN: 1612-202X

Record 9 of 333
Title: Perfect soliton crystal in a microcavity via sub-harmonic phase-modulation scheme
Author(s): Lu, ZZ (Lu, Zhizhou); Wang, Y (Wang, Yang); Zhao, BL (Zhao, Bailing); Liu, ML (Liu, Mulong); Wang, WQ (Wang, Weiqiang)
Source: JAPANESE JOURNAL OF APPLIED PHYSICS  Volume: 59  Issue: 6  Article Number: 060903  DOI: 10.35848/1347-4065/ab91ce  Published: JUN 1 2020  
Abstract: We numerically investigate perfect soliton crystal (PSC) generation in a sub-harmonic phase-modulated light pumped microcavity. Parts of the modulated pump frequency components are coupled into the microcavity through the Vernier effect between the modulated pump and cavity modes, which forms a chirped and periodic background wave for soliton formation. With improved pump efficiency, PSCs with 5-20 solitons are demonstrated in a microcavity featuring similar to 10 GHz free spectral range. It is further found that the modulator can be removed to decrease the pump power while maintaining PSC state. Our work enriches the dynamics and applications of cavity solitons.
Accession Number: WOS:000538497200001
ISSN: 0021-4922
eISSN: 1347-4065

Record 10 of 333
Title: Development of an ultra-thin active mirror based on carbon fiber composite
Author(s): Xu, L (Xu, Liang); Wang, YJ (Wang, Yongjie); Wu, XG (Wu, Xiaoge); Ding, JT (Ding, Jiaoteng); Ma, Z (Ma, Zhen); Shen, L (Shen, Le)
Source: OPTIK  Volume: 207  Article Number: 164463  DOI: 10.1016/j.ijleo.2020.164463  Published: APR 2020  
Abstract: Aiming at the application requirements of large synthetic aperture for light-weighted mirrors, a kind of ultra-thin active mirrors based on carbon fiber composites proposed. The structure of the mirror is a four-layer laminated structure, and the total thickness is only about 3mm.Using parallel actuation scheme, it has the advantages of low weight, rapid manufacturing, low cost, and smart surface adjustment ability. The design, numeral calculation, manufacture and surface correction test of this kind active mirror discussed in this article. A Phi 85mm aperture, 19-channel active mirror prototype developed, and surface correction test shows that the surface accuracy RMS can be corrected from 1.4 lambda to 0.15 lambda, about 10 times improved.
Accession Number: WOS:000523186200034
ISSN: 0030-4026
eISSN: 1618-1336

Record 11 of 333
Title: One-dimensional localized modes of spin -orbit -coupled Bose-Einstein condensates with spatially periodic modulated atom -atom interactions: Nonlinear lattices
Author(s): Chen, JB (Chen, Junbo); Zeng, JH (Zeng, Jianhua)
Source: COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION  Volume: 85  Article Number: 105217  DOI: 10.1016/j.cnsns.2020.105217  Published: JUN 2020  
Accession Number: WOS:000540278900004
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Zeng, Jianhua  AAL-5533-2021  0000-0003-0189-1856 
Chen, Junbo  AAM-5372-2021  0000-0001-6857-1481 
ISSN: 1007-5704
eISSN: 1878-7274

Record 12 of 333
Title: Full-polarization wavefront shaping for imaging through scattering media
Author(s): Li, RZ (Li, Runze); Peng, T (Peng, Tong); Zhou, ML (Zhou, Meiling); Yu, XH (Yu, Xianghua); Min, JW (Min, Junwei); Yang, YL (Yang, Yanlong); Yao, BL (Yao, Baoli)
Source: APPLIED OPTICS  Volume: 59  Issue: 17  Pages: 5131-5135  DOI: 10.1364/AO.391909  Published: JUN 10 2020  
Abstract: The scattering effect occurring when light passes through inhomogeneous-refractive-index media such as atmosphere or biological tissues will scramble the light wavefront into speckles and impede optical imaging. Wavefront shaping is an emerging technique for imaging through scattering media that works by addressing correction of the disturbed wavefront. In addition to the phase and amplitude, the polarization of the output scattered light will also become spatially randomized in some cases. The recovered image quality and fidelity benefit from correcting as much distortion of the scattered light as possible. Liquid-crystal spatial light modulators (LC-SLMs) are widely used in the wavefront shaping technique, since they can provide a great number of controlled modes and thereby high-precision wavefront correction. However, due to the working principle of LC-SLMs, the wavefront correction is restricted to only one certain linear polarization state, resulting in retrieved image information in only the right polarization, while the information in the orthogonal polarization is lost. In this paper, we describe a full-polarization wavefront correction system for shaping the scattered light wavefront in two orthogonal polarizations with a single LC-SLM. The light speckles in both polarizations are corrected for retrieval of the full polarization information and faithful images of objects. As demonstrated in the experiments, the focusing intensity can be increased by full-polarization wavefront correction, images of objects in arbitrary polarization states can be retrieved, and the polarization state of the object's light can also be recognized. (C) 2020 Optical Society of America
Accession Number: WOS:000540285800028
PubMed ID: 32543531
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Li, Runze  ABF-1320-2020  0000-0002-0154-2202 
Yao, Baoli  AAB-4606-2021   
Peng, Tong    0000-0003-0373-5136 
Yu, Xianghua    0000-0002-7447-1396 
ISSN: 1559-128X
eISSN: 2155-3165

Record 13 of 333
Title: Retrieval of non-sparse objects through scattering media beyond the memory effect
Author(s): Zhou, ML (Zhou, Meiling); Li, RZ (Li, Runze); Peng, T (Peng, Tong); Pan, A (Pan, An); Min, JW (Min, Junwei); Bai, C (Bai, Chen); Dan, D (Dan, Dan); Yao, BL (Yao, Baoli)
Source: JOURNAL OF OPTICS  Volume: 22  Issue: 8  Article Number: 085606  DOI: 10.1088/2040-8986/aba0fc  Published: AUG 2020  
Abstract: Optical imaging through scattering media is commonly constrained to sparse objects and the optical memory effect. To solve the problems, a method based on the combination of ptychography and the shower-curtain effect is presented here to achieve the retrieval of non-sparse samples through scattering media beyond the memory effect. The phase disturbance introduced by scattering media can be neglected based on the shower-curtain effect, and also the field-of-view can be extended via the ptychography. Results of the retrieval of hair-follicle cell from human skin demonstrate the effectiveness and feasibility of the proposed method for static and dynamic scattering media with the extended field-of-view to be 3.2 mm x 3.2 mm. The present work may be an approach for imaging through deep biological tissues.
Accession Number: WOS:000556710500001
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Yao, Baoli  AAB-4606-2021   
Zhou, Meiling  ABI-5952-2020  0000-0002-1160-7903 
ISSN: 2040-8978
eISSN: 2040-8986

Record 14 of 333
Title: Resonant Degenerate Four-Wave Mixing in SO2
Author(s): Wei, W (Wei, W.); Lu, ZZ (Lu, Z. Z.); Dong, Q (Dong, Q.); Sun, YL (Sun, Y. L.); Ma, L (Ma, L.); Liao, JL (Liao, J. L.); Liu, JF (Liu, J. F.); Xie, XP (Xie, X. P.); Zhao, W (Zhao, W.)
Source: ACTA PHYSICA POLONICA A  Volume: 137  Issue: 6  Pages: 1022-1026  DOI: 10.12693/APhysPolA.137.1022  Published: JUN 2020  
Abstract: We report an experimental investigation of degenerate four-wave mixing spectrum of SO2. A novel beam-split technique is used to compensate the beam drift caused by the laser itself and disturbance from the environment. Degenerate four-wave mixing spectra of the transition (BB1)-B-1 <- X(1)A(11) for SO2 are obtained. The degenerate four-wave mixing signal intensity as a function of the total input laser energy is measured. The effects of the laser field intensity on the degenerate four-wave mixing spectrum are analyzed. Our results show that the degenerate four-wave mixing signal intensity rises with laser intensity and tends to saturate. Then, a dip begins to appear at resonance in the profile with increase in laser field. The existence of saturation for degenerate four-wave mixing signal intensity and spectrum profile confirms the prediction of previous theoretical work.
Accession Number: WOS:000558676600002
ISSN: 0587-4246
eISSN: 1898-794X

Record 15 of 333
Title: Modulated solitons, soliton and vortex clusters in purely nonlinear defocusing media
Author(s): Zeng, LW (Zeng, Liangwei); Zeng, JH (Zeng, Jianhua)
Source: ANNALS OF PHYSICS  Volume: 421  Article Number: 168284  DOI: 10.1016/j.aop.2020.168284  Published: OCT 2020  
Abstract: By means of standard Thomas-Fermi approximation, we present stable solutions of one- and two-dimensional (1D and 2D) multi-hump soliton structures, including 1D and 2D modulated solitons as well as 2D soliton clusters, supported by inhomogeneous defocusing nonlinear Kerr media. Such nonlinear settings may apply to nonlinear optics and Bose-Einstein condensates. All the 1D and 2D fundamental modes with different numbers of humps (for both modulated solitons and soliton clusters) are demonstrated to be robustly stable. Besides, the considered 2D nonlinear setting also supports a vast varieties of vortex modes- vortex soliton clusters. Such novel type of vortex soliton clusters is qualitatively different from the ordinary vortex clusters, on the account of the fact that the latter type is a single large soliton with several-vortex configurations inside it, while our predicted vortex clusters structures are composed of the arrays of unitary vortex solitons. Stability regions for all the soliton structures are identified via linear stability analysis and direct simulations. (C) 2020 Elsevier Inc. All rights reserved.
Accession Number: WOS:000591353900021
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Zeng, Jianhua  AAL-5533-2021  0000-0003-0189-1856 
Zeng, Liangwei    0000-0001-9603-1845 
ISSN: 0003-4916
eISSN: 1096-035X

Record 16 of 333
Title: Tunable doublet lens based on dielectric metasurface using phase-change material
Author(s): Li, XY (Li, Xingyi); Li, SQ (Li, Siqi); Wang, GX (Wang, Guoxi); Lei, YF (Lei, Yufang); Hong, YF (Hong, Yunfan); Zhang, LX (Zhang, Lingxuan); Zeng, C (Zeng, Chao); Wang, LR (Wang, Leiran); Sun, QB (Sun, Qibing); Zhang, WF (Zhang, Wenfu)
Source: MODERN PHYSICS LETTERS B  Volume: 34  Issue: 28  Article Number: 2050313  DOI: 10.1142/S0217984920503133  Published: OCT 10 2020  
Abstract: Metasurfaces have recently emerged to realize flat optical components with various functions and providing potential capabilities in manufacturing active devices. In this paper, a doublet lens for mid-infrared wavelength with tunable focal length has been proposed. The designed metalens consists of two dielectric metalenses with different focal lengths patterned on a phase-change materials Ge2Sb1Te4. The doublet lens is proved to have above 13% change in the focal length with the crystalline states shifting of the Ge2Sb1Te4. And the designed doublet lens can be operated in mid-infrared region from 2.41 mu m to 2.60 mu m. In addition, chromatic calibration can be achieved by adjusting the crystalline phases of the Ge2Sb1Te4. This compatible metalens promises potential for a wide range of applications in MIR region such as multi-spectrum imaging, optical coupling system and micrography.
Accession Number: WOS:000580598200011
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Li, Xingyi    0000-0001-6339-0729 
ISSN: 0217-9849
eISSN: 1793-6640

Record 17 of 333
Title: 41.8 W output power, 200 kHz repetition rate ultra-fast laser based on Yb:YAG single crystal fiber(SCF)amplifier
Author(s): Wang, NN (Wang, Na Na); Wang, XL (Wang, Xiang Lin); Hu, XH (Hu, Xiao Hong); Zhang, T (Zhang, Ting); Yuan, H (Yuan, Hao); Zhang, W (Zhang, Wei); Li, F (Li, Feng); Wang, YS (Wang, Yi Shan); Zhao, W (Zhao, Wei)
Source: OPTICS AND LASER TECHNOLOGY  Volume: 127  Article Number: 106202  DOI: 10.1016/j.optlastec.2020.106202  Published: JUL 2020  
Abstract: We demonstrate a high repetition rate, high energy chirped pulse amplification (CPA) system based on single crystal fiber (SCF) amplifier. With home-made all-fiber laser as the seed laser and Yb:YAG rod, SCF as the amplification gain medium, an output power of 61.8 W at 200 kHz repetition rate has been obtained. To the best of our knowledge, this is the highest power based on SCF at hundreds of kHz repetition rate. The measured M-2 values are approximately 1.241 in the horizontal and 1.186 in the vertical direction. The spectrum width is 3.8 nm, which support Fourier transform-limited pulse duration of 411 fs. An average power of 41.8 W with pulse duration of 1.5 ps has been obtained after the chirped volume Bragg grating (CVBG) compressor, which will be compressed to hundreds of fs with accurate chirp compensation.
Accession Number: WOS:000523646800001
ISSN: 0030-3992
eISSN: 1879-2545

Record 18 of 333
Title: Development of a 67.8 W, 2.5 ps ultrafast chirped-pulse amplification system based on single-crystal fiber amplifiers
Author(s): Wang, NN (Wang, Na Na); Li, F (Li, Feng); Wang, XL (Wang, Xiang Lin); Hu, XH (Hu, Xiao Hong); Wang, YS (Wang, Yi Shan); Zhao, W (Zhao, Wei)
Source: APPLIED OPTICS  Volume: 59  Issue: 27  Pages: 8106-8110  DOI: 10.1364/AO.399680  Published: SEP 20 2020  
Abstract: We demonstrate a high-power, high-energy chirped-pulse amplification (CPA) system based on three Yb:YAG amplifiers and a chirped-volume Bragg grating (CVBG). With an all-fiber laser as the seed light, a Yb:YAG rod amplifier and two Yb:YAGsingle-crystal fiber (SCF) amplifiers as the amplification stages, a laser power of 96W at 200 kHz repetition rate corresponding to a pulse energy of 0.48 mJ has been generated. The stability of different output power has been measured and compared. To the best of our knowledge, this is the first report on a stable 100W-level laser with sub-mJ pulse energy based on SCF. The beam quality M-2 of different output lasers has also been measured, which is below 1.55 when the output power is 92W. The amplified laser is seeded into the CVBG to be compressed, and a compression efficiency of 0.724 has been obtained with an output power of 67.8W and pulse duration of 2.5 ps. The ultrafast CPA system delivering high pulse energy (sub-mJ) with hundreds of kHz repetition rate is expected to be used as the driving source of high-flux high-harmonic generation after further compression. (C) 2020 Optical Society of America
Accession Number: WOS:000571489300007
PubMed ID: 32976388
ISSN: 1559-128X
eISSN: 2155-3165

Record 19 of 333
Title: Binary amplitude-only image reconstruction through a MMF based on an AE-SNN combined deep learning model
Author(s): Chen, H (Chen, Hui); He, ZQ (He, Zhengquan); Zhang, ZK (Zhang, Zaikun); Geng, Y (Geng, Yi); Yu, WX (Yu, Weixing)
Source: OPTICS EXPRESS  Volume: 28  Issue: 20  Pages: 30048-30062  DOI: 10.1364/OE.403316  Published: SEP 28 2020  
Abstract: The obstacle of imaging through multimode fibers (IVLMFs) is encountered due to the fact that the inherent mode dispersion and mode coupling lead the output of the MMF to be scattered and bring about image distortions. As a result, only noise-like speckle patterns can be formed on the distal end of the MMF. We propose a deep learning model exploited for computational imaging through an MMF, which contains an autoencoder (AE) for feature extraction and image reconstruction and self-normalizing neural networks (SNNs) sandwiched and employed for high-order feature representation. It was demonstrated both in simulations and in experiments that the proposed AE-SNN combined deep learning model could reconstruct image information from various binary amplitude-only targets going through a 5-meter-long MMF. Simulations indicate that our model works effectively even in the presence of system noise, and the experimental results prove that the method is valid for image reconstruction through the MMF. Enabled by the spatial variability and the self-normalizing properties, our model can be generalized to solve varieties of other computational imaging problems. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Accession Number: WOS:000581074800106
PubMed ID: 33114890
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Yu, Weixing  G-3658-2012  0000-0002-3216-526X 
Zhang, Zaikun    0000-0003-4660-5307 
ISSN: 1094-4087

Record 20 of 333
Title: In-plane micro-displacement measurement based on secondary diffraction
Author(s): Liu, SR (Liu, Shengrun); Xue, B (Xue, Bin); Yu, JR (Yu, Jirui); Xu, GZ (Xu, Guangzhou); Lv, J (Lv, Juan); Cheng, Y (Cheng, Ying); Yang, JF (Yang, Jianfeng)
Source: AIP ADVANCES  Volume: 10  Issue: 4  Article Number: 045203  DOI: 10.1063/1.5143339  Published: APR 1 2020  
Abstract: For precision machinery, the measurement of the relative in-plane displacement of two parallel planes that are separated by several meters is important. In this paper, a theoretical model for measuring the relative in-plane microdisplacement between two parallel planes was developed on the basis of secondary diffraction. Based on this method, we employed a pinhole and a circular-ring as the diffraction screens. The influence of the structural parameters of diffraction screens on the secondary diffraction pattern was analyzed in detail, and the obtained parameters were then used in the experimental measurements. For experimental investigation, a laser beam at 532 nm was used to irradiate a pinhole; the diffracted light was then further diffracted using a circular-ring, and the final diffraction pattern was recorded using a CCD camera. The circular-ring was mounted on the plane to be measured, while the pinhole and the CCD camera remained stationary; the space between the pinhole and the circular-ring was set at 1200 mm. The displacement of the circular-ring can be calculated by comparing the central position of the two diffraction patterns before and after shifting the circular-ring. Over a measurement range of 0-90 mu m, the absolute error in the displacement measurement was less than 1.97 mu m.
Accession Number: WOS:000525096100003
eISSN: 2158-3226

Record 21 of 333
Title: Method for black ice detection on roads using tri-wavelength backscattering measurements
Author(s): Ma, XX (Ma, Xinxu); Ruan, C (Ruan, Chi)
Source: APPLIED OPTICS  Volume: 59  Issue: 24  Pages: 7242-7246  DOI: 10.1364/AO.398772  Published: AUG 20 2020  
Abstract: This paper provides a method of detecting black ice on a road surface by multiwavelength noncontact optical technology. The laser sources, wavelengths of 1310, 1430, and 1550 nm, were irradiated on the road surface. Then, we define the ratio of the backscattering power under a certain condition to the backscattering power under dry conditions as the normalized reflectance. It is found that the normalized reflectance under dry, water, black ice, icy, and snowy conditions is different. Therefore, the normalized reflectance can be used to identify black ice on a road surface. (C) 2020 Optical Society of America
Accession Number: WOS:000571481100011
PubMed ID: 32902498
ISSN: 1559-128X
eISSN: 2155-3165

Record 22 of 333
Title: Hybrid CPA system comprised by fiber-silicate glass fiber-single crystal fiber with femtosecond laser power more than 90 W at 1 MHz
Author(s): Li, F (Li, Feng); Yang, Z (Yang, Zhi); Lv, ZG (Lv, Zhiguo); Duan, YF (Duan, Yufei); Wang, NN (Wang, Nana); Yang, Y (Yang, Yang); Li, QL (Li, Qianglong); Yang, XJ (Yang, Xiaojun); Wang, YS (Wang, Yishan); Zhao, W (Zhao, Wei)
Source: OPTICS AND LASER TECHNOLOGY  Volume: 129  Article Number: 106291  DOI: 10.1016/j.optlastec.2020.106291  Published: SEP 2020  
Abstract: A high power and hybrid chirped pulse amplification (CPA) system comprised by fiber-silicate glass fiber-single crystal fiber amplifier is demonstrated in this work. In this hybrid system, the high gain compact silicate glass fiber amplifier is used to boost the power, amplified power more than 92 W is obtained with the injected power of 400 mW at 1 MHz, corresponded amplification gain as high as 23.6 dB. To our best knowledge, this is the highest power obtained in CPA amplification with silicate glass fiber. The single crystal fiber amplifier is used to boost the energy with low nonlinearity in high pulse energy amplification. Amplified power of 122 Wat 1 MHz is obtained, corresponding to a pulse energy of 122 mu J. After amplification, the laser pulses are compressed by chirped volume Bragg grating (CVBG), the total compression efficiency greater than 73% is obtained by control the spectrum width with a fiber filter with pass band of 5 nm in the fiber pre-amplifier to match the reflected bandwidth of the CVBG compressor. To match the dispersion between the chirped fiber Bragg grating (CFBG) stretcher and the CVBG compressor, the self-made temperature tuning device of CFBG is employed to make precision dispersion match. The optimized pulse width of 660 fs at compressed power of 90 W is obtained. This compact and high power ultrafast laser will find various applications in scientific research and industrial applications.
Accession Number: WOS:000537415900030
ISSN: 0030-3992
eISSN: 1879-2545

Record 23 of 333
Title: Influence of amplified spontaneous emission on laser linewidth in a fiber amplifier
Author(s): Xue, MY (Xue, Mingyuan); Gao, CX (Gao, Cunxiao); Niu, LQ (Niu, Linquan); Zhu, SL (Zhu, Shaolan); Sun, CD (Sun, Chuandong)
Source: APPLIED OPTICS  Volume: 59  Issue: 8  Pages: 2610-2614  DOI: 10.1364/AO.383507  Published: MAR 10 2020  
Abstract: Spectral broadening due to amplified spontaneous emission (ASE) in a fiber amplifier is experimentally and theoretically investigated in this paper. By measuring and analyzing the variation in linewidth and noise of the fiber amplifier, the influence of ASE on laser linewidth is studied. The analysis shows that the ASE will cause broadening of the laser linewidth as noise, and the noise is introduced as an additive term rather than a multiplicative one. (C) 2020 Optical Society of America
Accession Number: WOS:000526528200056
PubMed ID: 32225805
ISSN: 1559-128X
eISSN: 2155-3165

Record 24 of 333
Title: A novel color calibration method of multi-spectral camera based on normalized RGB color model
Author(s): Wang, H (Wang, Hong); Yang, JF (Yang, Jianfeng); Xue, B (Xue, Bin); Yan, XT (Yan, Xingtao); Tao, JY (Tao, Jinyou)
Source: RESULTS IN PHYSICS  Volume: 19  Article Number: 103498  DOI: 10.1016/j.rinp.2020.103498  Published: DEC 2020  
Abstract: True-color image of Mars is important for mineral analysis. The working light source of the Mars exploration multi-spectral camera is different from the laboratory calibration light source, so that the commonly used RGB calibration method has a large color difference in correcting the on-orbit images. After analyzing the influence of light source lightness and relative spectral distribution on the camera output values, their influences are considered separately in the calibration. A new color calibration method in the luminance-independent chromaticity space is proposed. The RGB color components of multi-spectral camera are normalized and converted to chromaticity values, and the polynomial calibration model in chromaticity space is compared with the RGB method. The experimental results showed that the average value of CIE DE2000 color differences after color calibration was 4.32, which was 0.96 less than that of RGB method. When the calibration matrix was used to correct the outdoor scene images, the corrected color difference gain because of the change of imaging light source was reduced by 0.54 compared to the RGB method. The color calibration method and the calibration data in this paper provide theoretical support for the color correction of the Mars multi-spectral camera on-orbit images.
Accession Number: WOS:000604225100006
ISSN: 2211-3797

Record 25 of 333
Title: Full-color optically-sectioned imaging by wide-field microscopy via deep-learning
Author(s): Bai, C (Bai, Chen); Qian, J (Qian, Jia); Dang, SP (Dang, Shipei); Peng, T (Peng, Tong); Min, JW (Min, Junwei); Lei, M (Lei, Ming); Dan, D (Dan, Dan); Yao, BL (Yao, Baoli)
Source: BIOMEDICAL OPTICS EXPRESS  Volume: 11  Issue: 5  Pages: 2619-2632  DOI: 10.1364/BOE.389852  Published: MAY 1 2020  
Abstract: Wide-field microscopy (WFM) is broadly used in experimental studies of biological specimens. However, combining the out-of-focus signals with the in-focus plane reduces the signal-to-noise ratio (SNR) and axial resolution of the image. Therefore, structured illumination microscopy (SIM) with white light illumination has been used to obtain full-color 3D images, which can capture high SNR optically-sectioned images with improved axial resolution and natural specimen colors. Nevertheless, this full-color SIM (FC-SIM) has a data acquisition burden for 3D-image reconstruction with a shortened depth-of-field, especially for thick samples such as insects and large-scale 3D imaging using stitching techniques. In this paper, we propose a deep-learning-based method for full-color WFM, i.e., FC-WFM-Deep, which can reconstruct high-quality full-color 3D images with an extended optical sectioning capability directly from the FC-WFM z-stack data. Case studies of different specimens with a specific imaging system are used to illustrate this method. Consequently, the image quality achievable with this FC-WFM-Deep method is comparable to the FC-SIM method in terms of 3D information and spatial resolution, while the reconstruction data size is 21-fold smaller and the in-focus depth is doubled. This technique significantly reduces the 3D data acquisition requirements without losing detail and improves the 3D imaging speed by extracting the optical sectioning in the depth-of-field. This cost-effective and convenient method offers a promising tool to observe high-precision color 3D spatial distributions of biological samples. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Accession Number: WOS:000532568000024
PubMed ID: 32499948
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Yao, Baoli  AAB-4606-2021   
Peng, Tong    0000-0003-0373-5136 
ISSN: 2156-7085

Record 1 of 333
Title: Screen printing of upconversion NaYF4:Yb3+/Eu3+ with Li+ doped for anti-counterfeiting application
Author(s): Li, DD (Li, Dongdong); Mo, JY (Mo, Jianye); Wang, C (Wang, Chong); Liu, W (Liu, Wei); Ge, HB (Ge, Haibo); Han, DD (Han, Dongdong); Hao, AH (Hao, Aihua); Chai, BY (Chai, Baoyu); She, JB (She, Jiangbo)
Source: CHINESE OPTICS LETTERS  Volume: 18  Issue: 11  Article Number: 110501  DOI: 10.3788/COL202018.110501  Published: NOV 10 2020  
Abstract: Li ions affect the upconversion efficiency by changing the local crystal field of the luminescent center. Herein, in order to improve the upconversion efficiency of NaYF4:Yb3+/Eu3+, a series of NaYF4:Yb3+/Eu3+ micro-particles with different Li+ doping concentrations were synthesized by the hydrothermal synthesis method, respectively. Firstly, the structure and morphology of NaYF4:Yb3+/Eu3+ upconversion micro-particles (UCMPs) with differ-ent doping concentrations were analyzed by X-ray diffraction and a scanning electron microscope (SEM). SEM results show that the UCMPs are not only highly crystallized, but also have hexagons with different Li+ concentrations of NaYF4:Yb3+/Eu3+. X-ray diffraction shows that the crystal field around Eu3+ changes with the increase of Li+ concentration. Then, the fluorescence spectrum of NaYF4:Yb3+/Eu3+ was studied under the irradiation of a 980 nm laser. The results show that the fluorescence intensity of NaYF4:Yb3+/Eu3+ with 2% Li+ is the strongest, which is twice the intensity of NaYF4:Yb3+/Eu3+ without Li+. Finally, the fluorescence imaging analysis of NaYF4:Yb3+/Eu3+ with 2% Li+ concentration was carried out. The UCMPs are used to screen printing to evaluate the imaging effect on different sample surfaces. The results show NaYF4:Yb3+/Eu3+ (with 2% Li+) has great application prospects in anti-counterfeiting recognition.
Accession Number: WOS:000591933400006
ISSN: 1671-7694

Record 2 of 333
Title: Simulation Study on Spectral Characteristics of Skin Tissue and Volume Pulse Wave in 400 similar to 1 000 nm Wavelength
Author(s): Zhou, L (Zhou Liang); Yu, JJ (Yu Jiang-jun); Liu, ZH (Liu Zhao-hui); Li, ZG (Li Zhi-guo); Shan, QS (Shan Qiu-sha)
Source: SPECTROSCOPY AND SPECTRAL ANALYSIS  Volume: 40  Issue: 4  Pages: 1071-1075  DOI: 10.3964/j.issn.1000-0593(2020)04-1071-05  Published: APR 2020  
Abstract: According to the anatomical structure of the skin tissue, we established a six-layer model, and the characteristic parameters of each layer of skin tissue were given. We considered the absorption characteristics of oxidized hemoglobin and reduced hemoglobin, and gave the spectral absorption coefficients of each layer of skin tissue according to the contents of water, blood, fat and oxygen saturation in each layer of skin tissue, as well as the size of blood vessels. The scattering coefficients at different wavelengths were simplified properly, and then the scattering coefficient spectra of each layer of skin tissue were obtained. In this paper, we used Monte Carlo method to simulate the transmission process of 400 similar to 1 000 nm wavelength light in the multi-layer model of skin tissue under the conditions of contraction and relaxation. The spectral reflectance of the skin tissue was obtained by counting the distribution characteristics of a large number of photons. The amplitude spectrum of volume pulse wave was obtained by calculating the reflection coefficient of the two states obtained from the simulation. The simulation results showed that the volume pulse wave amplitude of green light is better than that of red light and blue light when the incident light intensity is constant. The penetration depth spectrum of skin tissue was obtained by calculating the corresponding skin tissue depth when the light flux of different wavelengths decreased to 1/e along the direction of skin tissue depth. The results showed that the penetration depth of blue light and green light is small, the blue light can only reach the surface layer, the green light can reach the micro-circulation layer, and the penetration depth of red light is the largest, which can reach the dermis directly. Considering when the light travels through the skin, it involves a dynamic process from contraction to relaxation, so we define the depth of pulse signal generation based on penetration depth, and the spectral generation depth is calculated by using the penetration depth of vasodilation and contraction in two different states. The results showed that the depth of light generation at different wavelengths is greater than the penetration depth, the depth of blue light is shallowand the blood absorption modulation is small, so the pulse signal obtained is more easily interfered by noise. The volume pulse wave of red light is deeper than that of green light, but compared with green light, its absorption and modulation by blood is smaller, and the depth of green light generation is enough to reach the dermis vascular layer, so the amplitude of red light volume pulse wave is smaller than that of green light. Our simulation results confirm some spectral characteristics of skin tissue, which provides a theoretical basis for the accurate acquisition of multispectral volume pulse waves and other related studies.
Accession Number: WOS:000534352300014
ISSN: 1000-0593

Record 3 of 333
Title: Tracing and implementation of IMM Kalman filtering feed-forward compensation technology based on neural network
Author(s): Lin, D (Lin Di); Wu, YM (Wu Yi-ming)
Source: OPTIK  Volume: 202  Article Number: 163574  DOI: 10.1016/j.ijleo.2019.163574  Published: FEB 2020  
Abstract: UAV has great varieties, large controllable velocity and angular velocity, which makes high requirements on automatically identifying capability and tracking accuracy of ground search and tracking system. It happens frequently that servo feed-forward compensation technology is added in the search and tracking system to improve the tracking accuracy. However, accurate estimations of target velocity and acceleration becomes the difficult point of controlling feed-forward compensation technology. This paper proposes to adopt IMM Kalman filter technology based on neural network to estimate velocity and acceleration of the moving targets, which served as input variable of the servo feed-forward compensation system to eliminate the error of the missing distance caused by velocity and acceleration. Neural network can identify target types and makes self-adaptive adjustment on IMM Kalman filter parameters, which is helpful to improve estimation accuracy. Experimental results show that IMM Kalman filter feed-forward compensation technology based on neural network in the search and tracking system can improve the tracking accuracy of the system by more than 3 times than the conventional Kalman filter compensation, and the model verification is effective.
Accession Number: WOS:000506348800172
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Lin, Di    0000-0003-4535-4059 
ISSN: 0030-4026
eISSN: 1618-1336

Record 4 of 333
Title: A 51.3 W, sub-kHz-linewidth linearly polarized all-fiber laser at 1560 nm
Author(s): Xue, MY (Xue, Mingyuan); Gao, CX (Gao, Cunxiao); Niu, LQ (Niu, Linquan); Zhu, SL (Zhu, Shaolan); Sun, CD (Sun, Chuandong)
Source: LASER PHYSICS  Volume: 30  Issue: 3  Article Number: 035104  DOI: 10.1088/1555-6611/ab67ce  Published: MAR 2020  
Abstract: We demonstrate a continuous-wave high output power and narrow linewidth all-fiber master oscillator power amplifier laser at 1560 nm. The laser output power is 51.3 W with 36.38% optical-to-optical conversion efficiency and a linewidth of 0.865 kHz. The measured signal-to-noise ratio is 49 dB, and the polarization extinction ratio is greater than 20 dB. The laser can be used for high-efficiency nonlinear frequency conversion.
Accession Number: WOS:000537550300002
ISSN: 1054-660X
eISSN: 1555-6611

Record 5 of 333
Title: Cascaded few-mode fiber down-taper modal interferometers and their application in curvature sensing
Author(s): Chen, EQ (Chen, Enqing); Dong, B (Dong, Bo); Li, Y (Li, Yang); Wang, XL (Wang, Xiaoli); Zhao, YD (Zhao, Yudi); Xu, W (Xu, Wei); Zhao, W (Zhao, Wei); Wang, YS (Wang, Yishan)
Source: OPTICS COMMUNICATIONS  Volume: 475  Article Number: 126274  DOI: 10.1016/j.optcom.2020.126274  Published: NOV 15 2020  
Abstract: Few-mode fiber modal interferometers (MIs) based on cascaded fiber down-tapers and their application in curvature sensing are presented. Cascaded fiber down-taper structure can help excite more higher-order cladding modes to construct the inter-modal interference with the core mode. However, with the increase of the cascaded number of the fiber down-tapers, the curvature sensitivity of the MI is decreased accordingly. This provides a new way to control the curvature sensitivity of such device by cascading fiber down-tapers. Experimental results show that compared with the two down-tapers based MI, the curvature sensitivity of the three down-tapers one reduced by 1.64 times while the four down-tapers one reduced by 5.82 times.
Accession Number: WOS:000563999700017
ISSN: 0030-4018
eISSN: 1873-0310

Record 6 of 333
Title: Improving performance of semipolar (20(2)over-bar1) light emitting diodes through reduction of threading dislocations by AlGaN/GaN superlattice interlayer
Author(s): Song, J (Song, Jie); Choi, J (Choi, Joowon); Han, J (Han, Jung)
Source: JOURNAL OF CRYSTAL GROWTH  Volume: 536  Article Number: 125575  DOI: 10.1016/j.jcrysgro.2020.125575  Published: APR 15 2020  
Abstract: We report reducing the density of threading dislocations (TDs) in stacking-fault-free semipolar (20 (2) over bar1) GaN grown on sapphire by inserting an AlGaN/GaN superlattice (SL). We have studied the influence of AlGaN/GaN SL on the reduction of TDs and found that the density of TDs decreases by more than a factor of three with increasing the number of AlGaN/GaN SL pairs up to 10. Furthermore, blue light emitting diodes (LEDs) have been grown on semipolar (20 (2) over bar1) GaN/sapphire templates with inserted 10 pairs of AlGaN/GaN SL showing doubled light output power in comparison with the LEDs grown without AlGaN/GaN SL.
Accession Number: WOS:000520838100010
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Song, Jie    0000-0001-6245-2879 
ISSN: 0022-0248
eISSN: 1873-5002

Record 7 of 333
Title: Observation of various bound states based on a graded index multimode fiber saturable absorber
Author(s): Zhao, FY (Zhao, Fengyan); Wang, HS (Wang, Hushan); Wang, YS (Wang, Yishan); Hu, XH (Hu, Xiaohong); Zhang, T (Zhang, Ting); Pan, R (Pan, Ran)
Source: LASER PHYSICS LETTERS  Volume: 17  Issue: 2  Article Number: 025105  DOI: 10.1088/1612-202X/ab63da  Published: FEB 2020  
Abstract: The formation of stable single solitons and various bound states based on a graded index multimode fiber (GIMF) is investigated experimentally for the first time. Taking advantage of the principle of nonlinear multimode interference, a 143.5 cm length of GIMF is bent and two polarization controllers are used to achieve stable passive mode-locking. The spectrum of single solitons centers on 1590.5 nm with a spectral bandwidth of 3.2 nm. 976 fs of pulse duration is obtained at the repetition rate of 14.31 MHz. The maximum output power of 14.572 mW with a corresponding single-pulse energy of 1 nJ is achieved. Meanwhile, all kinds of bound states, including soliton pairs, soliton triplets, soliton quartets, and multiple-pulse bound states with different pulse separations are realized. The bound soliton with two pulses obtained has a fixed pulse interval as the incident pump power is increased. Our results suggest that a GIMF might be employed as an effective saturable absorber for ultrafast photonics applications.
Accession Number: WOS:000519695300004
ISSN: 1612-2011
eISSN: 1612-202X

Record 8 of 333
Title: Point-ahead analysis and pre-pointing link stability study of intersatellite laser communication
Author(s): Zhang, FR (Zhang, Fu-Rui); Han, JF (Han, Jun-Feng); Ruan, P (Ruan, Ping)
Source: OPTICA APPLICATA  Volume: 50  Issue: 1  Pages: 111-126  DOI: 10.37190/oa200109  Published: 2020  
Abstract: The static bias error angle obviously affects pre-pointing links' stability in the presence of vibration in intersatellite laser communication. The 2nd order point-ahead angle is a source of misalignment which was ignored in most solutions, and this is the concern of our paper. In this study, we present a further analytical investigation into the point-ahead angle in complex satellite maneuvering environment. Static bias error angle induced by the 2nd order point-ahead angle has been studied under different intersatellite links. The probability density function of the pre-pointing links' outage has been derived in the presence of pointing jitter taking consideration of the static bias angle, and the link budget has also been analyzed. Simulation model of link stability has been established to verify the numerical results by the Monte Carlo method in Matlab-Simulink environment. The results have shown that the 2nd order point-ahead angle has a significant detrimental impact on link stability in long distance links. It is a neglectable factor. This work is dedicated to intersatellite laser communication system design.
Accession Number: WOS:000535550000009
ISSN: 0078-5466
eISSN: 1899-7015

Record 9 of 333
Title: High-precision resin layer polishing of carbon fiber mirror based on optimized ion beam figuring process
Author(s): Ding, JT (Ding, Jiao Teng); Fan, XW (Fan, Xue Wu); Xu, L (Xu, Liang); Ma, Z (Ma, Zhen); Wang, YJ (Wang, Yong Jie); Wu, XG (Wu, Xiao Ge)
Source: OPTIK  Volume: 206  Article Number: 163575  DOI: 10.1016/j.ijleo.2019.163575  Published: MAR 2020  
Abstract: Based on the advantages of stress-free and non-liquid environment, ion beam polishing is the ideal processing technology for the Resin modified layer polishing of the carbon fiber mirror. Since the glass transition temperature of the resin is low, the energy absorbed by the surface of the mirror during ion beam processing can cause localized high temperatures, which can lead to the risk of resin softening. The finite element analysis software was used to simulate the heat transfer process of Ion beam acting on the resin modified layer. The optimum process parameters of the ion beam polishing were determined. At the same time, the resin layer surface polishing test was completed. The experimental results show that the surface polishing of the resin modified layer can be achieved by ion beam processing, and it has the convergence property and the correctness of the theoretical model is Verified.In addition, according to the process instability phenomenon in the ion beam figuring of carbon fiber-based resin modified layer, analytical research on factors affecting the accuracy of ion beam processing were carried out. The effects of various factors on the processing precision of carbon fiber resin layer were analyzed by combing and theoretical analysis,combined with experimental research to determine the amount of influence, and finally put forward corresponding solutions.
Accession Number: WOS:000522772400022
ISSN: 0030-4026
eISSN: 1618-1336

Record 10 of 333
Title: A novel method for the definition of central wavelength and spectral bandwidth
Author(s): Wang, H (Wang, Hong); Yang, JF (Yang, Jianfeng); Xue, B (Xue, Bin)
Source: RESULTS IN PHYSICS  Volume: 18  Article Number: 103327  DOI: 10.1016/j.rinp.2020.103327  Published: SEP 2020  
Abstract: Spectral calibration is an essential step in the calibration process of multispectral camera for Mars exploration. The precision of spectral calibration has a direct impact on the accuracy of Mars multispectral data inversion. The most common method for determining the central wavelength and spectral bandwidth of a multispectral camera is to fit the spectral response using a Gaussian function. The peak value fitted by Gauss is defined as the central wavelength of the camera, and the full width of the spectral band at half maximum is defined as the spectral bandwidth. But the spectral response of the Mars exploration multispectral camera in the near-infrared waveband deviates from the Gaussian distribution. In this case, the relative output deviation and the relative radiation error are large when data inversion is performed using the central wavelength and the spectral bandwidth determined by Gaussian fitting. In this paper, the spectral response of a multispectral camera is taken as a weight function, and a generalized weighted method is proposed to redefine the central wavelength and spectral bandwidth of the multispectral camera. The central wavelength is defined as the weighted average of wavelengths against the spectral response weighted factor, while the spectral bandwidth is defined as the generalized w bandwidth when the area within the bandwidth is w% of the total area. The simulation results showed that the relative output deviation was reduced by an average of 0.1% and a maximum of 1.3%, while the relative radiation error by an average of 0.14% and by a maximum of 1.83%, when compared with the Gaussian definition. The experiment results of the Mars exploration multispectral camera showed that there was an average reduction of 0.06% in relative output deviation and 0.05% in relative radiation error. The generalized weighted method provides another way for the definition of central wavelength and spectral bandwidth, and improvs the precision of Mars multispectral data inversion.
Accession Number: WOS:000577349600006
ISSN: 2211-3797

Record 11 of 333
Title: Proposal-Based Visual Tracking Using Spatial Cascaded Transformed Region Proposal Network
Author(s): Zhang, XM (Zhang, Ximing); Luo, SJ (Luo, Shujuan); Fan, XW (Fan, Xuewu)
Source: SENSORS  Volume: 20  Issue: 17  Article Number: 4810  DOI: 10.3390/s20174810  Published: SEP 2020  
Abstract: Region proposal network (RPN) based trackers employ the classification and regression block to generate the proposals, the proposal that contains the highest similarity score is formulated to be the groundtruth candidate of next frame. However, region proposal network based trackers cannot make the best of the features from different convolutional layers, and the original loss function cannot alleviate the data imbalance issue of the training procedure. We propose the Spatial Cascaded Transformed RPN to combine the RPN and STN (spatial transformer network) together, in order to successfully obtain the proposals of high quality, which can simultaneously improves the robustness. The STN can transfer the spatial transformed features though different stages, which extends the spatial representation capability of such networks handling complex scenarios such as scale variation and affine transformation. We break the restriction though an easy samples penalization loss (shrinkage loss) instead of smooth L1 function. Moreover, we perform the multi-cue proposals re-ranking to guarantee the accuracy of the proposed tracker. We extensively prove the effectiveness of our proposed method on the ablation studies of the tracking datasets, which include OTB-2015 (Object Tracking Benchmark 2015), VOT-2018 (Visual Object Tracking 2018), LaSOT (Large Scale Single Object Tracking), TrackingNet (A Large-Scale Dataset and Benchmark for Object Tracking in the Wild) and UAV123 (UAV Tracking Dataset).
Accession Number: WOS:000569711300001
PubMed ID: 32858907
eISSN: 1424-8220

Record 12 of 333
Title: Spin momentum-dependent orbital motion
Author(s): Yan, SH (Yan, Shaohui); Li, MM (Li, Manman); Liang, YS (Liang, Yansheng); Cai, YA (Cai, Yanan); Yao, BL (Yao, Baoli)
Source: NEW JOURNAL OF PHYSICS  Volume: 22  Issue: 5  Article Number: 053009  DOI: 10.1088/1367-2630/ab7edd  Published: MAY 2020  
Abstract: We present a theoretic analysis on (azimuthal) spin momentum-dependent orbital motion experienced by particles in a circularly-polarized annular focused field. Unlike vortex phase-relevant (azimuthal) orbital momentum flow whose direction is specified by the sign of topological charge, the direction of (azimuthal) spin momentum flow is determined by the product of the field's polarization ellipticity and radial derivative of field intensity. For an annular focused field with a definite polarization ellipticity, the intensity's radial derivative has opposite signs on two sides of the central ring (intensity maximum), causing the spin momentum flow to reverse its direction when crossing the central ring. When placed in such a spin momentum flow, a probe particle is expected to response to this flow configuration by changing the direction of orbital motion as it traversing from one side to the other. The reversal of the particle's orbital motion is a clear sign that spin momentum flow can affect particles' orbital motion alone even without orbital momentum flow. More interestingly, for dielectric particles the spin momentum-dependent orbital motion tends to be 'negative', i.e., in the opposite direction of the spin momentum flow. This arises mainly because of spin-orbit interaction during the scattering process. For the purpose of experimental observation, we suggest the introduction of an auxiliary radially-polarized illumination to adjust the particle's radial equilibrium position, for the radial gradient force of the circularly-polarized annular focused field tends to constrain the particle at the ring of intensity maximum.
Accession Number: WOS:000531629900001
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Yao, Baoli  AAB-4606-2021   
Yan, Shaohui    0000-0003-3983-7206 
Liang, Yansheng    0000-0002-3561-1317 
ISSN: 1367-2630

Record 13 of 333
Title: Spontaneous symmetry breaking in purely nonlinear fractional systems
Author(s): Chen, JB (Chen, Junbo); Zeng, JH (Zeng, Jianhua)
Source: CHAOS  Volume: 30  Issue: 6  DOI: 10.1063/5.0006050  Published: JUN 2020  
Abstract: Spontaneous symmetry breaking, a spontaneous course of breaking the spatial symmetry (parity) of the system, is known to exist in many branches of physics, including condensed-matter physics, high-energy physics, nonlinear optics, and Bose-Einstein condensates. In recent years, the spontaneous symmetry breaking of solitons in nonlinear wave systems is broadly studied; understanding such a phenomenon in nonlinear fractional quantum mechanics with space fractional derivatives (the purely nonlinear fractional systems whose fundamental properties are governed by a nonlinear fractional Schrodinger equation), however, remains pending. Here, we survey symmetry breaking of solitons in fractional systems (with the fractional diffraction order being formulated by the Levy index
alpha) of a nonlinear double-well structure and find several kinds of soliton families in the forms of symmetric and anti-symmetric soliton states as well as asymmetric states. Linear stability and dynamical properties of these soliton states are explored relying on linear-stability analysis and direct perturbed simulations, with which the existence and stability regions of all the soliton families in the respective physical parameter space are identified.
Accession Number: WOS:000541903700003
PubMed ID: 32611086
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Zeng, Jianhua  AAL-5533-2021  0000-0003-0189-1856 
Chen, Junbo  AAM-5372-2021  0000-0001-6857-1481 
ISSN: 1054-1500
eISSN: 1089-7682

Record 14 of 333
Title: Dependence of interferogram phase on incident wavenumber and phase stability of Doppler asymmetric spatial heterodyne spectroscopy*
Author(s): Zhang, YF (Zhang, Ya-Fei); Feng, YT (Feng, Yu-Tao); Fu, D (Fu, Di); Wang, PC (Wang, Peng-Chong); Sun, J (Sun, Jian); Bai, QL (Bai, Qing-Lan)
Source: CHINESE PHYSICS B  Volume: 29  Issue: 10  Article Number: 104204  DOI: 10.1088/1674-1056/ab9de8  Published: OCT 2020  
Abstract: Instrument drifts introduce additional phase errors into atmospheric wind measurement of Doppler asymmetric spatial heterodyne spectroscopy (DASH). Aiming at the phase sensitivity of DASH to instrument drifts, in this paper we calculate the optical path difference (OPD) and present an accurate formula of DASH interferogram. By controlling variables in computational ray-tracing simulations and laboratory experiments, it is indicated that initial phase is directly determined by incident wavenumber, OPD offset and field of view (FOV). Accordingly, it is indicated that retrieved phase of DASH is sensitive to slight structural change caused by instrument drift, which provides the proof of necessary-to-track and -correct phase errors from instrument drifts.
Accession Number: WOS:000578316600001
ISSN: 1674-1056
eISSN: 1741-4199

Record 15 of 333
Title: Point ahead angle prediction based on Kalman filtering of optical axis pointing angle in satellite laser communication
Author(s): Zhang, FR (Zhang, Furui); Ruan, P (Ruan, Ping); Han, JF (Han, Junfeng)
Source: OPTICAL REVIEW  Volume: 27  Issue: 6  Pages: 447-454  DOI: 10.1007/s10043-020-00608-6  Early Access Date: JUL 2020   Published: DEC 2020  
Abstract: Point ahead angle (PAA) prediction is important in space laser communication, but the existing methods have low accuracy and complicated calculation processes. In this paper, a new PAA prediction method is proposed based on Kalman filtering of the optical axis pointing trajectory. The proposed method uses the high precision of fine tracking to improve the accuracy of predictive filtering. Taking ground-satellite laser communication as the research background, the beam transmission process in a typical acquisition, pointing, and tracking (APT) system is derived, then the Kalman filter model is established, and a simulation of the model is performed. The results show that the PAA can be predicted accurately and the error of the PAA can be reduced effectively the maximum prediction error is 3.8 mu rad only, and the method does not need to take the complex satellite perturbations into consideration. The proposed approach improves the accuracy of PAA prediction and contributes to the design of space laser communication systems.
Accession Number: WOS:000553265500001
ISSN: 1340-6000
eISSN: 1349-9432

Record 16 of 333
Title: A contour self-compensated network for salient object detection
Author(s): Wang, YN (Wang, Yanan); Wang, HW (Wang, Huawei); Cao, JZ (Cao, Jianzhong)
Source: VISUAL COMPUTER  Volume: 37  Issue: 6  Pages: 1467-1479  DOI: 10.1007/s00371-020-01882-w  Early Access Date: JUN 2020   Published: JUN 2021  
Abstract: Given that existing salient object detection methods cannot effectively predict the fine contours of salient objects when extracting local or global contexts and features, we propose a novel contour self-compensated network (CSCNet) to generate a more accurate saliency map with complete contour. Unlike the common binary saliency detection, we reconstruct the salient object detection problem into a multi-classification problem of the background, the salient object, and the salient contour, where the salient contour is used as the third label for ground truth. Meanwhile, the image and its superpixel map are concatenated as the input of our network to add more edge information. Also, a penalty loss is proposed to restrict the spatial relationship between the background, objects, and their contours. Experimentally, we evaluate the proposed CSCNet on six benchmark datasets in both accuracy and efficiency and evaluate the attribute-based performance on the SOC dataset. Compared with 13 state-of-the-art algorithms, our CSCNet can detect salient objects more accurately and completely without adding too many convolutional layers and parameters.
Accession Number: WOS:000543677800001
ISSN: 0178-2789
eISSN: 1432-2315

Record 17 of 333
Title: Compact optics module to generate arbitrary vector vortex beams
Author(s): Zhou, Y (Zhou, Yuan); Li, X (Li, Xing); Cai, YA (Cai, Yanan); Zhang, YA (Zhang, Yanan); Yan, SH (Yan, Shaohui); Zhou, ML (Zhou, Meiling); Li, MM (Li, Manman); Yao, BL (Yao, Baoli)
Source: APPLIED OPTICS  Volume: 59  Issue: 28  Pages: 8932-8938  DOI: 10.1364/AO.401184  Published: OCT 1 2020  
Abstract: We demonstrated a compact optical module that is capable of efficiently generating vector vortex beams With this device, a linearly polarized input beam can be converted into a vector beam with arbitrary spatial polarization and phase distributions, accompanied by an energy utilization up to 61%. Equally important, the area utilization of the spatial light modulator, a key component in the device, is as high as 65.5%. With the designed vector-vortex-beam-generation module, several types of VVBs with different vortex topological charges and spatial polarization distributions were created experimentally. This device may find applications in optical tweezers, laser machining, and soon. (C) 2020 Optical Society of America
Accession Number: WOS:000577161400051
PubMed ID: 33104580
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Yao, Baoli  AAB-4606-2021   
Zhou, Yuan    0000-0001-8983-6063 
ISSN: 1559-128X
eISSN: 2155-3165

Record 18 of 333
Title: Advances in soliton microcomb generation
Author(s): Wang, WQ (Wang, Weiqiang); Wang, LR (Wang, Leiran); Zhang, WF (Zhang, Wenfu)
Source: ADVANCED PHOTONICS  Volume: 2  Issue: 3  Article Number: 034001  DOI: 10.1117/1.AP.2.3.034001  Published: MAY 2020  
Abstract: Optical frequency combs, a revolutionary light source characterized by discrete and equally spaced frequencies, are usually regarded as a cornerstone for advanced frequency metrology, precision spectroscopy, high-speed communication, distance ranging, molecule detection, and many others. Due to the rapid development of micro/nanofabrication technology, breakthroughs in the quality factor of microresonators enable ultrahigh energy buildup inside cavities, which gives birth to microcavity-based frequency combs. In particular, the full coherent spectrum of the soliton microcomb (SMC) provides a route to low-noise ultrashort pulses with a repetition rate over two orders of magnitude higher than that of traditional mode-locking approaches. This enables lower power consumption and cost for a wide range of applications. This review summarizes recent achievements in SMCs, including the basic theory and physical model, as well as experimental techniques for single-soliton generation and various extraordinary soliton states (soliton crystals, Stokes solitons, breathers, molecules, cavity solitons, and dark solitons), with a perspective on their potential applications and remaining challenges.
Accession Number: WOS:000648540200002
eISSN: 2577-5421

Record 19 of 333
Title: Photoluminescence of Yb3+/Ce3+ co-doped aluminosilicate glasses under ultraviolet irradiation
Author(s): Feng, W (Feng, Wei); She, SF (She, Shengfei); Wang, PF (Wang, Pengfei); Liu, YS (Liu, Yongsheng); Chang, C (Chang, Chang); Hou, CQ (Hou, Chaoqi); Li, WN (Li, Weinan)
Source: JOURNAL OF NON-CRYSTALLINE SOLIDS  Volume: 528  Article Number: 119540  DOI: 10.1016/j.jnoncrysol.2019.119540  Published: JAN 15 2020  
Abstract: The photoluminescence and decay properties of Yb3+ /Ce3+ co-doped aluminosilicate glasses were investigated under ultraviolet irradiation. A strong excitation band was ascribed to 4f -> 5d transitions of Ce3+ ions. A broad ultraviolet-visible emission band belonged to 5d -> 4f transitions of Ce3+ ions and oxygen-deficient centers (ODCs) in the host matrix, and the visible-near infrared emission band was attributed to non-bridging oxygen hole centers. Comparative tests of the core composition were performed. The results showed Yb2O3 and the ODCs played a crucial role on ultraviolet-visible emission band. ODCs rather than Ce3+ ions were responsible for the 1-35 mu s lifetime decay of the ultraviolet-visible emission, but had no contribution to the longer decay lifetimes (77.58 Ns) for Ce-free Yb3+-doped glasses. A complex schematic energy-level diagram including the electron transfer mechanism such as Ce3+-Yb3+ -> Ce4+-Yb2+, the cooperative up- and down-conversion processes was proposed to describe different luminescence mechanisms UV-expose.
Accession Number: WOS:000504782500012
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Wang, Pengfei  D-7632-2012  0000-0002-5285-9832 
ISSN: 0022-3093
eISSN: 1873-4812

Record 20 of 333
Title: All-dielectric high saturation structural colors with Si3N4 metasurface
Author(s): Hong, YF (Hong, Yunfan); Lei, YF (Lei, Yufang); Fang, XM (Fang, Xiaoming); Li, XY (Li, Xingyi); Wen, WL (Wen, Wenlong); Zhang, LX (Zhang, Lingxuan); Ge, SY (Ge, Suyang); Li, SQ (Li, Siqi)
Source: MODERN PHYSICS LETTERS B  Volume: 34  Issue: 14  Article Number: 2050142  DOI: 10.1142/S0217984920501420  Published: MAY 20 2020  
Abstract: Structural colors engineering as a promising research area provides a high-resolution and environmental-friendly sustainable colors implementation. Here, metasurface-based concept was used to design waveguides and gratings of Si3N4 material on silicon dioxide substrates. The shift of reflection peaks can be controlled by structural parameters and efficiencies exceeded 90% with half height and width less than 10 nm. This induced structural color with superior saturation. Moreover, such nanostructures showed good sensitivity to polarization angle and incident angle of incident light. The proposed coloring devices look promising for applications in active color displays, imaging devices, and anti-counterfeiting and so on.
Accession Number: WOS:000537139300001
ISSN: 0217-9849
eISSN: 1793-6640

Record 21 of 333
Title: Sol-gel derived SiO2-B2O3-Na2O-ZnO-Al2O3 glass powder for glass-based composite
Author(s): Wen, CX (Wen, Changxiu); Cui, XX (Cui, Xiaoxia); Xu, YT (Xu, Yantao); Yang, PX (Yang, Pengxiang); Wang, XZ (Wang, Xiaozhang); Zhang, H (Zhang, Hui); Zhang, Y (Zhang, Yang); Lu, M (Lu, Min); Guo, HT (Guo, Haitao)
Source: MODERN PHYSICS LETTERS B  Volume: 34  Issue: 4  Article Number: 2050052  DOI: 10.1142/S0217984920500529  Published: FEB 10 2020  
Abstract: The glass powder with a relatively complicated composition of 64.02SiO(2)-10.05B(2)O(3)-7.84Na(2)O-14.07ZnO-4.02Al(2)O(3) (in wt.%) was first synthesized via sol-gel route. The optimal synthesis conditions for the amorphous gel are obtained. The glass transition temperature (T-g) of xerogel was detected as 552 degrees C and the glass network structure formed by the [SiO4], [BO4] and [AlO4] units were confirmed by the Fourier Transform-Infrared Spectroscopy (FT-IR). The phase structure and morphologies of glass powder were characterized by X-ray diffractometer (XRD) and Field Emission-Scanning Electron Microscope (FE-SEM), the xerogels and sol-gel glasses exhibit amorphous phase when the heat-treatment temperature increases from 300 degrees C to 700 degrees C. The prepared glass powder with high specific surface areas and a large amount of pores contribute to the synthesis of a composite of glass-mullite-beta-eucryptite at a relatively low sintering temperature of 800 degrees C, which present a relatively low coefficient of thermal expansion (CTE) and high mechanical strength.
Accession Number: WOS:000514154000004
ISSN: 0217-9849
eISSN: 1793-6640

Record 22 of 333
Title: Azimuthally phase-shifted Fibonacci zone plate
Author(s): Rafighdoost, J (Rafighdoost, Jila); Zhou, Y (Zhou, Yuan); Li, X (Li, Xing); Yan, SH (Yan, Shaohui); Zhou, ML (Zhou, Meiling); Yao, BL (Yao, Baoli)
Source: JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS  Volume: 37  Issue: 12  Pages: 3557-3563  DOI: 10.1364/JOSAB.402866  Published: DEC 1 2020  
Abstract: We present a novel and straightforward Fibonacci lens, which is created by binarizing and adding a spiral phase to its radial phase function. It is shown that this new element yields a pair of petal-like modes due to several segments of the Fibonacci lens, where each segment is phase shifted by pi compared to its adjacent segment. Also, the generated petals have highly controllable rotation, and their locations are adjustable, in which their focal distance ratio is equal to a mathematical parameter of the so-called golden ratio. Also, by changing the topological charge, an arbitrary even number of petals is obtained. (C) 2020 Optical Society of America
Accession Number: WOS:000595619400002
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Yao, Baoli  AAB-4606-2021   
Zhou, Yuan    0000-0001-8983-6063 
ISSN: 0740-3224
eISSN: 1520-8540

Record 23 of 333
Title: Numerical investigation of the periodical complementary dielectric-barrier discharge equipped with double-ring electrodes in atmospheric helium
Author(s): Wang, J (Wang, Jing); Li, J (Li, Jing); Lei, BY (Lei, Bingying); Xing, YF (Xing, Yufei); Xu, BP (Xu, Boping); Liu, YH (Liu, Yinghua); Li, XZ (Li, Xinzhong); Wang, YS (Wang, Yishan); Tang, J (Tang, Jie); Zhao, W (Zhao, Wei); Duan, YX (Duan, Yixiang)
Source: PHYSICS OF PLASMAS  Volume: 27  Issue: 7  DOI: 10.1063/5.0009695  Published: JUL 2020  
Abstract: A two-dimensional fluid model was used to investigate the characteristics of helium dielectric-barrier discharge (DBD) equipped with double-ring electrodes at atmospheric pressure. Simulation results show that although the temporal evolutions of discharge current and current density at different radial positions exhibit the same or similar characteristics to those in traditional DBD, a distinctive spatial discharge structure is observed during the discharge process. The spatial distribution of electron density at current peak moments exhibits a periodical complementary feature between the center-advantage and the periphery-advantage with the inner ring electrode covering the radial axis from 0.5 to 1.0mm. When the inner ring electrode covers the radial axis from 1.0 to 1.5mm, the spatial distribution of electron density satisfies another periodical complementary behavior between the electrode-center-advantage and the coexistence of periphery-advantage and center-advantage. These complementary discharge features mainly result from non-uniform electric field and surface charge distribution at the end of the previous discharge. The difference of the discharge structure between the two cases is attributed to the fact that Laplacian field distributions are largely dependent on the arrangement of double-ring electrodes. Our observations show that electrode geometry plays an important role in the formation of the discharge structure.
Accession Number: WOS:000547501600003
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Li, Xinzhong  P-7966-2018  0000-0002-6426-4043 
Tang, Jie    0000-0003-2162-6830 
Lei, Bingying    0000-0002-3843-3907 
ISSN: 1070-664X
eISSN: 1089-7674

Record 24 of 333
Title: Efficient learning-based blur removal method based on sparse optimization for image restoration
Author(s): Yang, HY (Yang, Haoyuan); Su, XQ (Su, Xiuqin); Chen, SM (Chen, Songmao); Zhu, WH (Zhu, Wenhua); Ju, CW (Ju, Chunwu)
Source: PLOS ONE  Volume: 15  Issue: 3  Article Number: e0230619  DOI: 10.1371/journal.pone.0230619  Published: MAR 27 2020  
Abstract: In imaging systems, image blurs are a major source of degradation. This paper proposes a parameter estimation technique for linear motion blur, defocus blur, and atmospheric turbulence blur, and a nonlinear deconvolution algorithm based on sparse representation. Most blur removal techniques use image priors to estimate the point spread function (PSF); however, many common forms of image priors are unable to exploit local image information fully. In this paper, the proposed method does not require models of image priors. Further, it is capable of estimating the PSF accurately from a single input image. First, a blur feature in the image gradient domain is introduced, which has a positive correlation with the degree of blur. Next, the parameters for each blur type are estimated by a learning-based method using a general regression neural network. Finally, image restoration is performed using a half-quadratic optimization algorithm. Evaluation tests confirmed that the proposed method outperforms other similar methods and is suitable for dealing with motion blur in real-life applications.
Accession Number: WOS:000535935400016
PubMed ID: 32218591
ISSN: 1932-6203

Record 25 of 333
Title: Breathing process monitoring with a biaxially oriented polypropylene film based fiber Fabry-Perot sensor
Author(s): Li, Y (Li, Yang); Dong, B (Dong, Bo); Chen, EQ (Chen, Enqing); Wang, XL (Wang, Xiaoli); Zhao, YD (Zhao, Yudi); Zhao, W (Zhao, Wei); Wang, YS (Wang, Yishan)
Source: OPTICS COMMUNICATIONS  Volume: 475  Article Number: 126292  DOI: 10.1016/j.optcom.2020.126292  Published: NOV 15 2020  
Abstract: The breathing process monitoring with a biaxially oriented polypropylene (BOPP) film based fiber Fabry-Perot (F-P) sensor is presented. The fiber F-P sensor is fabricated with 3-D printing technology and fixed on a medical respirator for breathing process monitoring. Due to the low Young's modulus of the BOPP film and its thinner thickness, the breathing sensor shows the high pressure sensitivity of-0.581 nm/Pa. By monitoring its intensity response to the pressure induced by breathing, the breathing process can be monitored accurately, including respiratory waveform, respiratory rate, inspiratory duration and amplitude, expiratory duration and amplitude, and inspiratory and expiratory rhythm. Since the sensor is all fiber design with the inherent advantages of small size, anti-electromagnetic interference, green environmental protection, pollution-free and no harm to body, it is expected to be widely used in respiratory disease monitoring.
Accession Number: WOS:000563999900009
ISSN: 0030-4018
eISSN: 1873-0310

Record 1 of 333
Title: Accelerating triangle-like singular beam
Author(s): Yan, SH (Yan, Shaohui); Li, MM (Li, Manman); Zhou, Y (Zhou, Yuan); Zhang, YA (Zhang, Yanan); Yao, BL (Yao, Baoli)
Source: JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION  Volume: 37  Issue: 12  Pages: 1965-1970  DOI: 10.1364/JOSAA.408431  Published: DEC 1 2020  
Abstract: We demonstrate a type of singular beam that accelerates along a parabolic trajectory and has a cross-section intensity pattern exhibiting a dark central region surrounded by multiple rings with the innermost (main) ring resembling an equilateral triangle. The key to creating such beams is to replace the standard triangle with a rounded one, made up of six circular arcs connected end to end. The individual input phase mask for each arc can be analytically computed, and the whole input phase mask for the beam is thus obtained by piecing together these individual phases. Furthermore, the continuity of field forces of these triangle-like modes is discrete; that is, an index similar to the topological charge of vortex beams arises. Numerical results show that the energy flow in the beam's cross section circulates around the dark center along the triangle-like main ring, suggesting a possible application in orbiting particles along an irregular path. (C) 2020 Optical Society of America.
Accession Number: WOS:000596504300005
PubMed ID: 33362140
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Zhou, Yuan    0000-0001-8983-6063 
ISSN: 1084-7529
eISSN: 1520-8532

Record 2 of 333
Title: Fractional quantum couplers
Author(s): Zeng, LW (Zeng, Liangwei); Zeng, JH (Zeng, Jianhua)
Source: CHAOS SOLITONS & FRACTALS  Volume: 140  Article Number: 110271  DOI: 10.1016/j.chaos.2020.110271  Published: NOV 2020  
Abstract: Fractional quantum coupler, a new type of quantum couplers that is composed of arrays of two coupled waveguides or a dual-core waveguide with intermodal coupling, within which the light waves diffraction is of the fractional-order differentiation, is put forward in the territory of fractional quantum mechanics. The modelling equations of such fractional couplers are derived in the framework of coupled nonlinear fractional Schrodinger equations with the space derivative of fractional order denoted by Levy index alpha, and localized wave solutions as spatial optical solitons of these equations are constructed and their nonlinear propagation properties are discussed. Linear perturbation method based on linear stability analysis, and direct simulations are conducted to identify the stability and instability regions of the predicted soli tons. (c) 2020 Elsevier Ltd. All rights reserved.
Accession Number: WOS:000596299500009
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Zeng, Jianhua  AAL-5533-2021  0000-0003-0189-1856 
Zeng, Liangwei    0000-0001-9603-1845 
ISSN: 0960-0779
eISSN: 1873-2887

Record 3 of 333
Title: Rapid tilted-plane Gerchberg-Saxton algorithm for holographic optical tweezers
Author(s): Cai, YN (Cai, Yanan); Yan, SH (Yan, Shaohui); Wang, ZJ (Wang, Zhaojun); Li, RZ (Li, Runze); Liang, YS (Liang, Yansheng); Zhou, Y (Zhou, Yuan); Li, X (Li, Xing); Yu, XH (Yu, Xianghua); Lei, M (Lei, Ming); Yao, BL (Yao, Baoli)
Source: OPTICS EXPRESS  Volume: 28  Issue: 9  Pages: 12729-12739  DOI: 10.1364/OE.389897  Published: APR 27 2020  
Abstract: Benefitting from the development of commercial spatial light modulator (SLM), holographic optical tweezers (HOT) have emerged as a powerful tool for life science, material science and particle physics. The calculation of computer-generated holograms (CGH) for generating multi-focus arrays plays a key role in HOT for trapping of a bunch of particles in parallel. To realize dynamic 3D manipulation, we propose a new tilted-plane GS algorithm for fast generation of multiple foci. The multi-focal spots with a uniformity of 99% can be generated in a tilted plane. The computation time for a CGH with 512x512 pixels is less than 0.1 second. We demonstrated the power of the algorithm by simultaneously trapping and rotating silica beads with a 7x7 spots array in three dimensions. The presented algorithm is expected as a powerful kernel of HOT. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Accession Number: WOS:000530854700019
PubMed ID: 32403764
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Yao, Baoli  AAB-4606-2021   
Liang, Yansheng    0000-0002-3561-1317 
Zhou, Yuan    0000-0001-8983-6063 
Yu, Xianghua    0000-0002-7447-1396 
ISSN: 1094-4087

Record 4 of 333
Title: Constraint analysis of measurement accuracy in high-precision X-ray pulsar positioning
Author(s): Yao, L (Yao, Li); Tong, S (Tong, Su); Mei, L (Mei, Luan); Zhang, FR (Zhang, Furui); Zhu, YC (Zhu, Yechuan); Yun, D (Yun, Du); Zhao, BS (Zhao, Baosheng)
Source: INTERNATIONAL JOURNAL OF MODERN PHYSICS B  Volume: 34  Issue: 30  Article Number: 2050296  DOI: 10.1142/S0217979220502963  Published: DEC 10 2020  
Abstract: In this paper, the relationship between direct measurement of X-ray pulsar angular position and second-order correlation is analyzed by classical statistical optics. On this basis, a scheme for measuring pulsar angle position is put forward on account of X-ray band intensity correlation, which is expected to achieve a positioning accuracy of 10 Mas. Finally, the connection between positioning accuracy and complex correlation in the intensity correlation measurement is studied. Also, main factors that affected the measurement are analyzed.
Accession Number: WOS:000599879800008
ISSN: 0217-9792
eISSN: 1793-6578

Record 5 of 333
Title: Graphene oxide functionalized micro-tapered long-period fiber grating for sensitive heavy metal sensing
Author(s): Wang, RD (Wang, Ruiduo); Ren, ZY (Ren, Zhaoyu); Kong, DP (Kong, Depeng); Wu, H (Wu, Hao); Hu, BW (Hu, Baowen); He, ZQ (He, Zhengquan)
Source: APPLIED PHYSICS EXPRESS  Volume: 13  Issue: 6  Article Number: 067001  DOI: 10.35848/1882-0786/ab8b53  Published: JUN 1 2020  
Abstract: We report a Ni2+ heavy metal sensor based on a graphene oxide (GO) functionalized micro-tapered long-period fiber grating (MTLPG) where light-matter interaction is enhanced. With high-quality GO coating on fiber with strong adhesion and controllable thickness, the GO-coated MTLPG demonstrated a resonant wavelength shift and intensity change, corresponding to a sensitivity of up to 5.12 x 10(-4) nm ppb(-1) and 3.07 x 10(-4) dB ppb(-1), respectively. Moreover, the limits of detection were 2.5 ppb and 0.27 ppb, respectively, operating in a wider concentration range of 1 ppb to 1 x 10(7) ppb. The proposed optical platform can be developed for superior chemical sensing applications.
Accession Number: WOS:000531246700001
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
kong, de peng    0000-0003-3359-5517 
Wang, Ruiduo    0000-0003-4420-4737 
ISSN: 1882-0778
eISSN: 1882-0786

Record 6 of 333
Title: Repetition-rate multiplicable soliton microcomb generation and stabilization via phase-modulated pumping scheme
Author(s): Zhao, BL (Zhao, Bailing); Wang, LR (Wang, Leiran); Sun, QB (Sun, Qibing); Lu, ZZ (Lu, Zhizhou); Liu, ML (Liu, Mulong); Wang, WQ (Wang, Weiqiang); Wang, GX (Wang, Guoxi); Gao, CX (Gao, Cunxiao); Zhang, WF (Zhang, Wenfu); Zhao, W (Zhao, Wei)
Source: APPLIED PHYSICS EXPRESS  Volume: 13  Issue: 3  Article Number: 032009  DOI: 10.35848/1882-0786/ab7481  Published: MAR 1 2020  
Abstract: We numerically demonstrate repetition rate multiplicable soliton microcomb generation using the phase-modulation pump scheme (PMS). Dissipative Kerr solitons are directly obtained avoiding the primary comb and chaotic modulation-instability stage and the repetition rate can be multiplied by changing the modulation frequency with fixed intensity. The PMS can not only help to stabilize emitted solitons with inhibited temporal drift against the Raman self-frequency shift effect, but also achieve soliton spacing equalization recovered from certain position fluctuations. Such approach can enable delicate manipulation on soliton behaviors, and provide a feasible route to soliton microcombs with even higher repetition rates and improved stabilities. (C) 2020 The Japan Society of Applied Physics.
Accession Number: WOS:000524725900009
ISSN: 1882-0778
eISSN: 1882-0786

Record 7 of 333
Title: Phase-locked two-color visible frequency comb system based on 1.5-mu m all-polarization-maintaining fiber laser
Author(s): Cai, YJ (Cai, Yajun); Pan, R (Pan, Ran); Hu, XH (Hu, Xiaohong); Feng, Y (Feng, Ye); Zhang, W (Zhang, Wei); Zhao, W (Zhao, Wei); Wang, YS (Wang, Yishan)
Source: OPTICAL ENGINEERING  Volume: 59  Issue: 2  Article Number: 026107  DOI: 10.1117/1.OE.59.2.026107  Published: FEB 2020  
Abstract: A two-color visible frequency comb system based on a 1.5-mu m all-polarization-maintaining (PM) fiber femtosecond laser was developed. This configuration relies on the implementation of three amplifiers, seeded by a single master oscillator. With the repetition rate (f(r)) of the oscillator locked to a reference frequency of 200 MHz, the output of the first amplifier was used to generate the feedback signal and achieve simultaneous phase lock of the carrier envelop offset frequency (f(ceo)). The remaining two independently configurable amplifiers followed by highly nonlinear fibers and MgO-doped periodically poled lithium niobite crystals were used to produce visible comb lights at 543 and 633 nm (in air), respectively. By referencing to a hydrogen maser, the Allan deviations of f(r) and f(ceo) at a gate time of 1 s are 438 mu Hz and 63 mHz, respectively. The spectral bandwidths of the 543- and 633-nm comb lights are 0.157 and 0.174 nm, respectively, and the single-mode powers of these comb lights are higher than 1 mu W. The multiple-branch all-PM fiber-based visible frequency comb system exhibiting a narrow spectrum and a high single-mode power will facilitate the development of optical clocks and wavelength standard calibrations. (C) 2020 Society of Photo-Optical Instrumentation Engineers (SPIE)
Accession Number: WOS:000523346700027
ISSN: 0091-3286
eISSN: 1560-2303

Record 8 of 333
Title: Blind Image Deconvolution Algorithm Based on Sparse Optimization with an Adaptive Blur Kernel Estimation
Author(s): Yang, HY (Yang, Haoyuan); Su, XQ (Su, Xiuqin); Chen, SM (Chen, Songmao)
Source: APPLIED SCIENCES-BASEL  Volume: 10  Issue: 7  Article Number: 2437  DOI: 10.3390/app10072437  Published: APR 2020  
Abstract: Image blurs are a major source of degradation in an imaging system. There are various blur types, such as motion blur and defocus blur, which reduce image quality significantly. Therefore, it is essential to develop methods for recovering approximated latent images from blurry ones to increase the performance of the imaging system. In this paper, an image blur removal technique based on sparse optimization is proposed. Most existing methods use different image priors to estimate the blur kernel but are unable to fully exploit local image information. The proposed method adopts an image prior based on nonzero measurement in the image gradient domain and introduces an analytical solution, which converges quickly without additional searching iterations during the optimization. First, a blur kernel is accurately estimated from a single input image with an alternating scheme and a half-quadratic optimization algorithm. Subsequently, the latent sharp image is revealed by a non-blind deconvolution algorithm with the hyper-Laplacian distribution-based priors. Additionally, we analyze and discuss its solutions for different prior parameters. According to the tests we conducted, our method outperforms similar methods and could be suitable for dealing with image blurs in real-life applications.
Accession Number: WOS:000533356200236
eISSN: 2076-3417

Record 9 of 333
Title: Reduction of beam divergence angle in laser-diode arrays with large smiles using a dual-beam transformation system
Author(s): Liu, B (Liu, Bin); Liu, H (Liu, Hui); Chen, FN (Chen, Fenning); Li, HY (Li, Haiyan); Gao, L (Gao, Lei); Zhu, PF (Zhu, Pengfei); Liu, XS (Liu, Xingsheng)
Source: OPTICS COMMUNICATIONS  Volume: 462  Article Number: 125279  DOI: 10.1016/j.optcom.2020.125279  Published: MAY 1 2020  
Abstract: Two new angled half-beam transformation systems (BTSs) for the reduction of the beam-divergence problem in laser-diode arrays with large smiles are investigated. Both simulations and experiments show that the angle of divergence of laser-diode arrays with the parabola-shaped smile and the S-shaped smile can be reduced by more than 37% and 23% respectively, when two angled half-BTSs are used in front of the laser-diode array. Furthermore, a fiber-coupling module, with a 400 mu m core-fiber and two angled half-BTSs, is fabricated. The optical/optical coupling efficiency increases to more than 85%, which is an improvement by more than 4% over laser diodes that use a full-BTS.
Accession Number: WOS:000519848700012
ISSN: 0030-4018
eISSN: 1873-0310

Record 10 of 333
Title: Impact of third-order dispersion and three-photon absorption on mid-infrared time magnification via four-wave mixing in Si0.8Ge0.2 waveguides
Author(s): Zheng, AH (Zheng, Aihu); Sun, QB (Sun, Qibing); Wang, LR (Wang, Leiran); Liu, ML (Liu, Mulong); Zeng, C (Zeng, Chao); Wang, GX (Wang, Guoxi); Zhang, LX (Zhang, Lingxuan); Fan, WC (Fan, Weichen); Zhao, W (Zhao, Wei); Zhang, WF (Zhang, Wenfu)
Source: APPLIED OPTICS  Volume: 59  Issue: 4  Pages: 1187-1192  DOI: 10.1364/AO.379232  Published: FEB 1 2020  
Abstract: We investigate the influence of third-order dispersion of dispersive elements, three-photon absorption and free-carrier effects on mid-infrared time magnification via four-wave mixing (FWM) in Si0.8Ge0.2 waveguides. It is found that the magnified waveform is seriously distorted by these factors, and conversion efficiency is decreased, mainly because of nonlinear absorption. A time lens based on FWM in Si0.8Ge0.2 waveguides is proposed for time magnification of mid-infrared ultrashort pulses, in which the low-distortion, high-magnification in the time domain could be obtained by optimizing system parameters. These results make it possible to analyze the transient dynamic process through oscilloscopes and detectors with gigahertz bandwidth and have important applications in ultrafast process analysis, optical pulse sampling, and optical communications. (C) 2020 Optical Society of America.
Accession Number: WOS:000526522000037
PubMed ID: 32225259
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Fan, Weichen    0000-0003-0041-955X 
Zeng, Chao    0000-0003-0097-6399 
ISSN: 1559-128X
eISSN: 2155-3165

Record 11 of 333
Title: Exploiting Embedding Manifold of Autoencoders for Hyperspectral Anomaly Detection
Author(s): Lu, XQ (Lu, Xiaoqiang); Zhang, WX (Zhang, Wuxia); Huang, J (Huang, Ju)
Source: IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING  Volume: 58  Issue: 3  Pages: 1527-1537  DOI: 10.1109/TGRS.2019.2944419  Published: MAR 2020  
Abstract: Hyperspectral anomaly detection is an important task in the remote sensing domain. Recently, researchers have shown great interest in deep learning-based methods because they can learn hierarchical, abstract, and high-level representations. However, the latent features learned from the autoencoder (AE) are not always able to reflect the intrinsic structure of hyperspectral data because the locality property is not considered during the learning process. In order to address this problem, a novel manifold constrained AE network (MC-AEN)-based hyperspectral anomaly detection method is proposed in this article. First, the manifold learning method is employed to learn the embedding manifold. Then, the latent representations are learned by an AE network with the learned embedding manifold constraints to preserve the intrinsic structure of hyperspectral data. Finally, the reconstruction errors are calculated to detect anomalies. The global reconstruction error from MC-AEN and the local reconstruction error from the learned latent representations are combined to fully utilize the learned knowledge for better detection performance. We test our proposed algorithm on three different real data sets. Experimental results on these three data sets show the superiority of our proposed method.
Accession Number: WOS:000519598700003
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Huang, Ju  AAI-8674-2021   
Lu, Xiaoqiang    0000-0002-7037-5188 
Zhang, Wuxia    0000-0002-0759-2489 
ISSN: 0196-2892
eISSN: 1558-0644

Record 12 of 333
Title: Application of Deep Neural Network in Quantitative Analysis of VOCs by Infrared Spectroscopy
Author(s): Zhang, Q (Zhang Qiang); Wei, RY (Wei Ru-yi); Yan, QQ (Yan Qiang-qiang); Zhao, YD (Zhao Yu-di); Zhang, XM (Zhang Xue-min); Yu, T (Yu Tao)
Source: SPECTROSCOPY AND SPECTRAL ANALYSIS  Volume: 40  Issue: 4  Pages: 1099-1106  DOI: 10.3964/j.issn.1000-0593(2020)04-1099-08  Published: APR 2020  
Abstract: In view of the fact that shallow artificial neural networks (ANNs) rely on prior knowledge for artificial extraction of features, while shallower network structures limit the ability of neural networks to learn complex nonlinear relationships, this paper applies deep neural networks (DNN) to the study of inversion of multi-component volatile organic compounds (VOCs) by leaf-transformed infrared spectroscopy (FTIR) , and the effectiveness of the algorithm was verified by simulation experiments. Eight VOCs including benzene, toluene, 1,3-butadiene, ethylbenzene, styrene, o-xylene, m-xylene, and p-xylene were selected from the US Environmental Protection Agency (EPA) database. In the wavelength range of 8 similar to 12 mu m, each gas has four different concentration lines, and the absorbance spectrum at one concentration is selected from each VOCs gas according to BeerLambert's law to obtain 65 536 different kinds. Samples of VOCs mixed gas absorbance spectra. The absorbance spectra of 5 000 groups of mixed gases were randomly selected, of which 4 000 were used as training samples and 1000 were used as prediction samples. The dimensional reduction of the spectral matrix was performed by integral extraction and principal component extraction, and the spectral dimension was reduced from 3457 to 30 dimensions. The new matrix obtained by preprocessing the spectral matrix was used as the network input, and the concentration matrix of the eight VOCs was used as the output. A deep neural network regression prediction model of 30-25-15-10-8 was established, and multiple groups were realized by using spectral data. Inversion of VOCs concentration, the root mean square error of the sample obtained by inversion was 0. 002 7X 10(-6), which was obvious compared with the accuracy of previous methods using nonlinear partial least squares fitting and artificial neural network, improve. The root mean square error of each VOCs gas does not exceed 0. 005 X 10(-6), and the root mean square error of each sample does not exceed 0. 006 X 10(-)(6) , which proves that the deep neural network prediction model has good nonlinear fitting ability. And good stability. When the training sample is insufficient (typical value: less than 500) , the deep neural network cannot fully learn, the network error is larger, and the accuracy is lower than that of the single hidden layer artificial neural network, but as the number of training samples increases, the deep neural network accuracy is continuously improved. When the number of training samples is sufficient, the deep neural network has stronger nonlinear relation learning ability than the shallow artificial neural network, and the prediction accuracy is higher and the model is more stable. At the same time, due to the dimensionality reduction of the spectral matrix before training, the complexity of the algorithm is greatly reduced, and the inversion efficiency is effectively improved. The analysis shows that the deep neural network prediction model has good nonlinear fitting ability and good stability. It can fully learn the data features without manual extraction of features, and at the same time, the concentration inversion of multi-component VOCs can achieve higher precision.
Accession Number: WOS:000534352300019
ISSN: 1000-0593

Record 13 of 333
Title: Compact, High-Performance All-Polarization-Maintaining Er: Fiber Frequency Comb With Single Fiber Actuator
Author(s): Cai, YJ (Cai, Yajun); Zhang, T (Zhang, Ting); Pan, R (Pan, Ran); Hu, XH (Hu, Xiaohong); Ye, F (Ye, Feng); Zhang, W (Zhang, Wei); Zhao, W (Zhao, Wei); Wang, YS (Wang, Yishan)
Source: IEEE PHOTONICS JOURNAL  Volume: 12  Issue: 4  DOI: 10.1109/JPHOT.2020.3010558  Published: AUG 2020  
Abstract: The large volume and weak environmental adaptability of fiber optical frequency combs (OFCs) have become the main obstacles for their applications in various fields. To address these issues, in this study, we present a compact, low-cost f-to-2f interferometer and fiber actuator with a large tuning range and a high control bandwidth for a 200-MHz OFC that is based on a 1.5-mu m all-polarization-maintaining fiber mode-locked laser. By employing customized fiber-coupled gradient index lenses, our f-to-2f interferometer is encapsulated in a miniature tube with a diameter of only 4 mm and a length of 40 mm, which substantially reduces the optical section size of the frequency comb as compared to conventional devices. The carrier envelope offset beat with a signal-to-noise ratio of 40 dB is detected in a resolution bandwidth of 360 kHz. In addition, a laboratory-made piezoelectric transducer-driven mechanical actuator for repetition rate regulation exhibited a large tuning range of 106 kHz (corresponding to an effective temperature drift of 53 degrees C) and a high control bandwidth of approximately 1 kHz. This resulted in a robust repetition rate locking with an Allan deviation of 330 mu Hz at a gate time of 1 s and a residual integrated timing jitter of 418 fs [3 Hz to 1 MHz] when referenced to a hydrogen maser. Along with reducing the size and improving the environmental adaptability of the OFC, our design can also decrease the power consumption of the system significantly. Our findings provide a new direction to the development of OFCs for various applications.
Accession Number: WOS:000559481100008
ISSN: 1943-0655
eISSN: 1943-0647

Record 14 of 333
Title: Improved two-step optimization procedure used for designing an apodizer and Lyot stop in the Lyot coronagraph
Author(s): Ge, R (Ge, Rui); Zhao, H (Zhao, Hui); Wei, JX (Wei, Jing-Xuan); Duan, YQ (Duan, Yong-Qiang); Bai, Z (Bai, Zhe); Li, C (Li, Chuang); Wang, YB (Wang, Yuan-Bo); Fan, XW (Fan, Xue-Wu)
Source: APPLIED OPTICS  Volume: 59  Issue: 16  Pages: 4939-4952  DOI: 10.1364/AO.391959  Published: JUN 1 2020  
Abstract: The Lyot coronagraph is a widely known astronomical instrument used to realize direct imaging of exoplanets, and designing transmittance of an apodizer and Lyot stop is the key to obtaining high-contrast imaging. In this paper a new (to the best of our knowledge) optimization procedure used to design the apodizer and Lyot stop in the Lyot coronagraph is proposed. A two-step optimization program is established to obtain the optimum transmittance of an apodizer and Lyot stop in a sequential way. By using the optimized apodizer and Lyot stop obtained through the proposed optimization procedure, both the stellar light and its diffraction light could be strongly suppressed. Numerical results indicate that such an optimized Lyot coronagraph can produce a 1e-10 extinction of the stellar light near the diffraction limit (1.59 lambda/D), and a high contrast imaging of 1e-07 could still be obtained even with the influence of light intensity of planets themselves. In addition, the two-step optimization procedure brings in two benefits. First, the two-step optimization is approximately 1000 times faster than the joint optimization method [J. Astron. Telesc. Instrum. Syst. 2, 011012 (2016)]. Second, the optimum transmittance of the Lyot stop is binary, and therefore, the requirements of the production process are reduced, resulting in a greatly reduced cost. At the same time, the performance of the optimized Lyot coronagraph is also analyzed in the case of a monochromatic light incident and bandwidth light incident, and the effect of the diameter of the Lyot stop on the results is also discussed in this paper, which makes sense when designing a coronagraph. (C) 2020 Optical Society of America
Accession Number: WOS:000537892700026
PubMed ID: 32543491
ISSN: 1559-128X
eISSN: 2155-3165

Record 15 of 333
Title: Anomalous ring-connected optical vortex array
Author(s): Li, XZ (Li, Xinzhong); Zhang, H (Zhang, Hao)
Source: OPTICS EXPRESS  Volume: 28  Issue: 9  Pages: 13775-13785  DOI: 10.1364/OE.390985  Published: APR 27 2020  
Abstract: In this study, an anomalous ring-connected optical vortex array (ARC-OVA) via the superposition of two grafted optical vortices (GOVs) with different topological charges (TCs) has been proposed. Compared with conventional OVAs, the signs and distribution of the OVs can be individually modulated, while the number of OVs remains unchanged. In particular, the positive and negative OVs simultaneously appear in the same intensity ring. Additionally, the size of the dark core occupied by the OV can be modulated, and the specific dark core is shared by a pair of plus-minus OVs. This work deepens our knowledge about connected OVAs and facilitates new potential applications, especially in particle manipulation and optical measurement. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Accession Number: WOS:000530854700100
PubMed ID: 32403845
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Li, Xinzhong  P-7966-2018  0000-0002-6426-4043 
Zhang, Hao    0000-0001-6514-9090 
ISSN: 1094-4087

Record 16 of 333
Title: Broadband and dispersion-free reflective silver metasurfaces as half-wave plate and vortex-beam generator
Author(s): Zhang, XD (Zhang, Xiaodong); Kong, DP (Kong, Depeng); Yuan, Y (Yuan, Yuan); Mei, S (Mei, Sen); Wang, LL (Wang, Lili); Wang, GX (Wang, Guoxi)
Source: OPTICS COMMUNICATIONS  Volume: 465  Article Number: 125561  DOI: 10.1016/j.optcom.2020.125561  Published: JUN 15 2020  
Abstract: Metasurfaces have attracted increasing interest in manipulation of polarization state due to optical response in sub-wavelength size. This paper presents an approach to design reflective silver metasurfaces and demonstrates that they can act as half-wave plate and vortex-beam generator with high performance in simulation, namely, polarization conversion efficiency is about 85% as half-wave plate and mode purity of vortex beam is greater than 80% as vortex-beam generator. The designed reflective metasurfaces comprise three layers. The top layer is composed of two elliptic silver sub-wavelength pillars assembled into L pattern and arranged into array distribution. The middle layer is a thin dielectric spacer (SiO2) and the bottom layer is silver ultrathin film. The metasurfaces have advantages of broadband (70 similar to 110 THz) and dispersion-free. The simulated results are also in good agreement with theoretical derivation. In addition, the separation between the reflective components makes the design more suitable for spatial mode multiplexing and may become a potential candidate in integrated optical communication system in future.
Accession Number: WOS:000521025300005
ISSN: 0030-4018
eISSN: 1873-0310

Record 17 of 333
Title: High current density photocathode for CW terahertz photoconductive vacuum devices
Author(s): Dai, J (Dai, Jun); Ruan, CJ (Ruan, Cunjun); Xu, XY (Xu, Xiangyan); Liu, HL (Liu, Hulin); Ding, YK (Ding, Yikun)
Source: VACUUM  Volume: 180  Article Number: 109587  DOI: 10.1016/j.vacuum.2020.109587  Published: OCT 2020  
Abstract: For vacuum electronics-related terahertz (THz) sources, robust, quick-response, and tunable continuous emission electron emitters are still challenging. In this paper, a continuous emission high current density Na2KSb(Cs) photocathode is developed and verified experimentally. The photocathode emission enhancement is achieved through optimization of film thickness, adjustment of the cesium activation, and dynamic optimization of the quantum efficiency during the synthesis process. The detailed evaporation procedures to perform the photo-cathode growth is investigated and reported. To maintain a higher current density, performances of photo-cathode evaporated on borosilicate glass and sapphire are tested respectively and analyzed comparatively. The results show that remarkable continuous current density can be achieved at 30 mA/cm(2 )on glass substrates, and 3A/cm(2) on sapphire substrates respectively. We found that the thermal conductivity of the substrates has a significant impact on high current density operations. The optimal emission current density has reached a promising value for future excitation of continuous wave (CW) THz wave radiation based on the photoconductive vacuum devices. These results also offer an opportunity to approach the generation and temporal shaping of planar array electron beams for THz vacuum tubes.
Accession Number: WOS:000566798900006
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Ruan, Cunjun    0000-0002-5248-9333 
ISSN: 0042-207X

Record 18 of 333
Title: Generation of controllable chiral optical fields by vector beams
Author(s): Li, MM (Li, Manman); Yan, SH (Yan, Shaohui); Zhang, YA (Zhang, Yanan); Yao, BL (Yao, Baoli)
Source: NANOSCALE  Volume: 12  Issue: 28  Pages: 15453-15459  DOI: 10.1039/d0nr02693j  Published: JUL 28 2020  
Abstract: Chirality is common in nature, describing not only the geometrical property of a three-dimensional object, but also an intrinsic feature of an optical field. Chiral optical fields are attracting increasing attention due to their potential applications in chiral light-matter interaction. Here we demonstrate a strategy to realize a controllable chiral optical field by tightly focusing two tailored vector beams in a 4 pi optical microscopic system. By modulating the wavefronts of the incident vector beams with appropriately designed phase masks, a chiral optical field with multiple spots carrying switchable handedness or controllable chirality can be generated. The location, the number and the handedness of such chiral spots can be arbitrarily adjusted depending on the actual application requirements. In addition to trapping and manipulating multiple particles, this controllable chiral optical field may find applications in enantioselective separation, chiral detection and chiral sensing at the nanoscale.
Accession Number: WOS:000552498200044
PubMed ID: 32666994
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Yao, Baoli  AAB-4606-2021   
ISSN: 2040-3364
eISSN: 2040-3372

Record 19 of 333
Title: Multiple Reliable Structured Patches for Object Tracking
Author(s): Wu, SY (Wu, Siyuan); Huang, J (Huang, Ju); Feng, YC (Feng, Yachuang); Sun, BY (Sun, Bangyong)
Source: COGNITIVE COMPUTATION  DOI: 10.1007/s12559-020-09741-5  Early Access Date: JUL 2020   
Abstract: It is essential to build the effective appearance model for object tracking in computer vision. Most object trackers can be roughly divided into two categories according to the appearance model: the bounding box model and the patch model. The bounding box model cannot handle shape deformation and occlusion of the non-rigid moving object effectively. The patch model is prone to be disturbed by complex backgrounds. In this paper, we propose a robust multi-structured-patch appearance model to represent the target for object tracking. The proposed appearance model is aimed to exploit and identify reliable patches that can be tracked effectively through the whole tracking process. According to attention mechanism in biological vision system, a coarse-to-fine strategy is usually used to search the target. Therefore, the proposed appearance model is represented by robust patches in different sizes, in which the bigger patches search the rough region of the target and the smaller patches estimate the accurate location. Experimental results on OTB100 dataset show that the proposed method outperforms state-of-the-art trackers.
Accession Number: WOS:000554346600002
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
wu, siyuan    0000-0002-9041-8587 
ISSN: 1866-9956
eISSN: 1866-9964

Record 20 of 333
Title: Non-blind image blur removal method based on a Bayesian hierarchical model with hyperparameter priors
Author(s): Yang, HY (Yang, Haoyuan); Su, XQ (Su, Xiuqin); Wu, J (Wu, Jing); Chen, SM (Chen, Songmao)
Source: OPTIK  Volume: 204  Article Number: 164178  DOI: 10.1016/j.ijleo.2020.164178  Published: FEB 2020  
Abstract: In many image blur removal schemes, a proper point spread function is usually estimated in advance from the blurry image, then the latent image comes out by using existing non-blind techniques. However, some of the techniques suffer from strong artifacts. Therefore, an efficient non-blind method plays an important role in image restoration issues. In most models, image priors act as the regularization terms that hold image details and suppress noises. This paper introduces a new image prior based on a parameterized scaled Gaussian model and a gamma distribution, with hyperparameters based on the statistical properties of tens of thousands of images. Our regularized cost function is then formed via a Bayesian hierarchical approach. It consists of a data fidelity term and a series of constraints on image gradients in multiple orientations. The former is used to assure the best approximation of the original image, and the latter is for preserving sharp edges. The optimization problem is solved by an effective tail-recursive algorithm based on the conjugate descent technique. Experimental results show that our model can both deal with simulated data and real scenes. The comparisons show our method outperforms others and achieves promising results.
Accession Number: WOS:000520025500065
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Su, Xiuqin    0000-0002-6554-2762 
ISSN: 0030-4026
eISSN: 1618-1336

Record 21 of 333
Title: Mid-infrared dual-comb generation via the cross-phase modulation effect in a normal-dispersion microcavity
Author(s): Guo, LJ (Guo, Liujun); Wang, LR (Wang, Leiran); Sun, QB (Sun, Qibing); Liu, ML (Liu, Mulong); Wang, GX (Wang, Guoxi); Wang, WQ (Wang, Weiqiang); Xie, P (Xie, Peng); Fan, WC (Fan, Weichen); Zhao, W (Zhao, Wei)
Source: APPLIED OPTICS  Volume: 59  Issue: 7  Pages: 2101-2107  DOI: 10.1364/AO.385401  Published: MAR 1 2020  
Abstract: We numerically demonstrate orthogonally polarized dual-comb generation in a single microcavity with normal dispersion assisted by the cross-phase modulation (XPM) effect. It is found that the XPM effect facilitates the emission of a secondary polarized comb with different temporal properties in a wide existence range covering the blue- to red-detuned regime and thus releases the requirements for delicate control on the detuned region of pump frequency. Also, the energy transfer between two polarization components together with the normal-dispersion property contributes to a more balanced intensity difference and significantly increased conversion efficiency from the pump light into the comb operation. This work could provide a route to a low-cost and compact mid-infrared dual-comb system with a lower power requirement as well as an effective approach to higher comb teeth power with improved efficiency for practical applications. (C) 2020 Optical Society of America
Accession Number: WOS:000526525000046
PubMed ID: 32225734
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Fan, Weichen    0000-0003-0041-955X 
ISSN: 1559-128X
eISSN: 2155-3165

Record 22 of 333
Title: Generation of a noise-like pulse from an erbium-doped fiber laser based on nonlinear multimode interference
Author(s): Zhao, FY (Zhao, Fengyan); Li, N (Li, Ning); Wang, HS (Wang, Hushan)
Source: LASER PHYSICS  Volume: 30  Issue: 12  Article Number: 125102  DOI: 10.1088/1555-6611/abc06d  Published: DEC 2020  
Abstract: A noise-like pulse (NLP) is generated in an anomalous-dispersion passively mode-locked erbium-doped fiber laser using graded-index multimode fiber (GIMF) as the all-fiber saturable absorber (SA) for the first time. By splicing two sections of bending GIMF at both ends of a single mode fiber and optimizing the birefringence and nonlinear parameters, stable NLP mode-locking operation can be achieved within a wide pump power range. Meanwhile, the performances of NLP mode-locking have been analyzed experimentally by changing the length of the GIMF.
Accession Number: WOS:000590131900001
ISSN: 1054-660X
eISSN: 1555-6611

Record 23 of 333
Title: Highly accurate 3D reconstruction based on a precise and robust binocular camera calibration method
Author(s): Hu, GL (Hu, Guoliang); Zhou, ZF (Zhou, Zuofeng); Cao, JZ (Cao, Jianzhong); Huang, HM (Huang, Huimin)
Source: IET IMAGE PROCESSING  Volume: 14  Issue: 14  Pages: 3588-3595  DOI: 10.1049/iet-ipr.2019.1525  Published: DEC 2020  
Abstract: The precision of the camera calibration is one of the key factors that affect attitude measurement accuracy in many computer vision tasks. This study proposes a new calibration approach for binocular cameras. Firstly, based on singular value decomposition, the best transformation matrix to the essential matrix is approximated as the initial guess, which is solved in using the Frobenius norm. Secondly, the initial guess is refined through maximum likelihood estimation. A new calculating expression is derived for computing the relative position matrix of the binocular cameras. The Levenberg-Marquardt algorithm is then implemented to refine the initial guess. Large sets of synthesised and real point correspondences were tested to demonstrate the validity of the proposed method. Extensive experiments demonstrated that the proposed method outperforms the state-of-the-art methods. The error rate of the proposed method was 0.5% for the length test and about 1% for the angle test at a range of 1 m. This method can advance three-dimensional (3D) computer vision one additional step from laboratory environments to real-world use.
Accession Number: WOS:000605364800031
ISSN: 1751-9659
eISSN: 1751-9667

Record 24 of 333
Title: Preparation and properties of Co0.85Se/RGO composite counter electrodes for quantum-dot-sensitized solar cells
Author(s): Zhang, ML (Zhang, Maolin); Li, J (Li, Jing); Nie, ZQ (Nie, Zhiqiang); Zhang, DY (Zhang, Dongyan); Yan, YX (Yan, Yangxi); Li, ZM (Li, Zhimin)
Source: JOURNAL OF OPTOELECTRONICS AND ADVANCED MATERIALS  Volume: 22  Issue: 1-2  Pages: 23-28  Published: JAN-FEB 2020  
Abstract: Counter electrodes (CEs) are fundamentally important components of quantum-dot-sensitized solar cells (QDSSCs), helping to transfer electrons from external circuit to electrolyte and acting as catalysts. In this work, Co0.85Se/RGO composite films were synthesized via one-step solvothermal process. X-ray diffraction (XRD), scanning electron microscope (SEM) and energy-dispersive spectrometer (EDS) were utilized to characterize the structure, morphology and elemental distribution of the composite CEs. The photovoltaic studies revealed that the composite CEs could yield PCE reaching 2.6% when assembled with CdS/CdSe/TiO2 photoanodes for QDSSCs. EIS and Tafel polarization indicated that the enhanced performances were due to combined high catalytic properties of Co0.85Se with better electron conductivity of RGO.
Accession Number: WOS:000530089000005
ISSN: 1454-4164
eISSN: 1841-7132

Record 25 of 333
Title: Effect of Sintering Conditions on Electrochemical Properties of LiNi0.8Co0.1Mn0.1O2 as Cathode Material
Author(s): Li, J (Li, Jing); Zhang, ML (Zhang, Maolin); Zhang, DY (Zhang, Dongyan); Yan, YX (Yan, Yangxi); Li, ZM (Li, Zhimin); Nie, ZQ (Nie, Zhiqiang)
Source: INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE  Volume: 15  Issue: 3  Pages: 1881-1892  DOI: 10.20964/2020.03.63  Published: MAR 2020  
Abstract: Many works of literature have reported the drastic effects of synthesis methods on the electrochemical performances of Ni-rich cathode materials LiNi0.8Co0.1Mn0.1O2 (NCM811). In this research, a two-step sol-gel method was successfully employed to synthesize pure NCM811 and the process of preparation is discussed in detail. The electrochemical properties depending on the structures and morphologies were verified by the multichannel galvanostatic system, EIS, XRD, and SEM. The results clarified that when the precursor was sintered at 750 degrees C for 15 h, the sample exhibited dominant electrochemical properties with initial discharge capacities of 230.8 and 176.3 mAh/g at 0.1 and 1 C, respectively. Moreover, the capacity retention rate is as high as 79% after 100 cycles at 1 C. These excellent electrochemical properties were considered to be arriving from the well-developed layered structure and low charge transfer resistance.
Accession Number: WOS:000519545900001
ISSN: 1452-3981

Record 1 of 333
Title: Investigation of high-precision algorithm for the spot position detection for four-quadrant detector
Author(s): Wang, X (Wang, Xuan); Su, XQ (Su, Xiuqin); Liu, GZ (Liu, Guizhong); Han, JF (Han, Junfeng); Wang, R (Wang, Rui)
Source: OPTIK  Volume: 203  Article Number: 163941  DOI: 10.1016/j.ijleo.2019.163941  Published: FEB 2020  
Abstract: In this paper, we propose a new polynomial fitting algorithm to improve the spot position detection accuracy based on four-Quadrant Detector (4QD) when the circular spot with Gaussian energy is used as the incident light model. The traditional polynomial fitting method is difficult to ensure high spot position detection accuracy in a wide detection range. To solve this problem, we analyze and compare the characteristics of different algorithms for spot position detection, and consider the influence of the 4QD gap size in the model. Based on the initial solution of the geometric approximation method, we introduce the error compensation factor function, a new spot position detection model is designed. The results of simulation and experiment show that the new algorithm can greatly reduce the position detection error of 4QD for Gaussian spot. When the radius of incident spot is 0.5 mm and within the detection range of [-0.5 mm similar to 0.5 mm], the maximum error is 0.001353 mm and the root-mean-square error is 0.0004596 mm with the new five-order polynomial fitting algorithm which are reduced 56.7% and 69.7% than traditional nine-order polynomial fitting algorithm. Moreover, the computational complexity of the new algorithm is much less than traditional algorithm and the new algorithm also has good prospects in laser communication, high energy laser weapons or others.
Accession Number: WOS:000545594000039
ISSN: 0030-4026
eISSN: 1618-1336

Record 2 of 333
Title: Yb/Ce Codoped Aluminosilicate Fiber With High Laser Stability for Multi-kW Level Laser
Author(s): She, SF (She, Shengfei); Liu, B (Liu, Bo); Chang, C (Chang, Chang); Xu, YT (Xu, Yantao); Xiao, XS (Xiao, Xusheng); Cui, XX (Cui, Xiaoxia); Li, Z (Li, Zhe); Zheng, JK (Zheng, Jinkun); Gao, S (Gao, Song); Zhang, Y (Zhang, Yan); Li, YZ (Li, Yizhao); Zhou, ZY (Zhou, Zhenyu); Mei, L (Mei, Lin); Hou, CQ (Hou, Chaoqi); Guo, HT (Guo, Haitao)
Source: JOURNAL OF LIGHTWAVE TECHNOLOGY  Volume: 38  Issue: 24  Pages: 6924-6931  DOI: 10.1109/JLT.2020.3019740  Published: DEC 15 2020  
Abstract: Further power scaling and stable laser performance were demonstrated in the Yb/Ce codoped aluminosilicate fiber fabricated through low-temperature chelate gas phase deposition technique. The molar ratio of Ce/Yb was designed and optimized to be 0.58 for low background loss, effective photodarkening suppression, and no additional thermal load. The background loss of this active fiber was 4.7 dB/km and its photodarkening loss at equilibrium was as low as 3.9 dB/m at 633 nm. Benefiting from low-temperature deposition technique, the fiber showed uniform core composition devoid of clustering and central 'dip' of refractive index profile and 0.19 mol% Yb2O3 was homogeneously dissolved into the fiber core plus with 0.41 mol% Al2O3, 0.11 mol% Ce2O3, and 0.32 mol% SiF4. Based on a master oscillator power amplifier laser setup, 5.04 kW laser output at 1079.80 nm was achieved with a slope efficiency of 81.1%. Stabilized at 5kW-level laser for over 60 minutes, the output power presented almost no power degradation, directly confirming a noticeable photodarkening mitigation.
Accession Number: WOS:000594923000024
ISSN: 0733-8724
eISSN: 1558-2213

Record 3 of 333
Title: Corrections to spectral restoration of Hadamard coding spectral imager
Author(s): Hu, BL (Hu, Bingliang); Tang, XJ (Tang, Xingjia); Li, LB (Li, Libo); Zhang, G (Zhang, Geng); Wang, S (Wang, Shuang); Yang, Y (Yang, Ying)
Source: SPECTROSCOPY LETTERS  Volume: 53  Issue: 10  Pages: 763-777  DOI: 10.1080/00387010.2020.1834409  Early Access Date: OCT 2020   Published: NOV 25 2020  
Abstract: Hadamard coding spectral imaging technology is a computational spectral imaging technology that modulates the target's spectral information and recovers the original spectrum by the inverse transformation. Compared with the dispersive spectrometer, this system has the advantage of better signal-to-noise ratio coming from multi-channel detection under low illumination. However, the coding process of this system is inevitability affected by several errors, including the misalignment of the coding template and the detector, scanning error, bad pixels, and so on. These errors would have an impact on the accuracy of the calculated spectrum. In this paper, we propose a unitive spectral reconstruction model under different errors and design an integrated approach to correct the above-mentioned errors simultaneously, including the bad pixel's correction method with window function smoothing, the coding matrix's correction method by using corrected template matrix to reconstruct coding matrix, and the push-scanning offset's correction method including the inversion of line offset correction and column offset compensation, which could achieve better performance with the increase of spatial dimension. Experimental results on synthesized data and prototype tests show that the proposed correction method is effective in both single noise case and multiple noises condition, it is more accurate than traditional corrections in which only data preprocessing is finished.
Accession Number: WOS:000583462800001
ISSN: 0038-7010
eISSN: 1532-2289

Record 4 of 333
Title: Kilowatt-level tunable all-fiber narrowband superfluorescent fiber source with 40 nm tuning range
Author(s): Li, Z (Li, Zhe); Li, G (Li, Gang); Gao, Q (Gao, Qi); Wu, P (Wu, Peng); She, SF (She, Shengfei); Wang, ZL (Wang, Zhaolu); Huang, N (Huang, Nan); Sun, CD (Sun, Chuandong); Gao, W (Gao, Wei); Ju, P (Ju, Pei); Liu, HJ (Liu, Hongjun)
Source: OPTICS EXPRESS  Volume: 28  Issue: 7  Pages: 10378-10385  DOI: 10.1364/OE.387405  Published: MAR 30 2020  
Abstract: In this study, we presented a high-power widely tunable all-fiber narrowband superfluorescent fiber source (SFS) by employing two tunable bandpass filters and three amplifier stages. More than 935 W output power is achieved, with a slope efficiency of > 75% and a beam quality factor of M-2 = 1.40. The tuning of the narrowband SFS ranges from similar to 1045 nm to similar to 1085 nm with a full width at half maximum linewidth of less than 0.71 nm. The tunable narrowband SFS stably operates without the influence of parasitic oscillation and self-pulsing effects under maximum power. To the best of our knowledge, this study is the first to demonstrate a widely tunable all-fiber narrowband SFS around 1 mu m wavelength region with output power reaching kilowatt-level. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Accession Number: WOS:000523766500109
PubMed ID: 32225624
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Li, Zhe    0000-0002-8796-4421 
ISSN: 1094-4087

Record 5 of 333
Title: Numerical simulation of multiple-current-pulse dielectric barrier discharge with ring electrodes in helium at atmospheric pressure
Author(s): Wang, J (Wang, Jing); Lei, BY (Lei, Bingying); Li, J (Li, Jing); Xu, YG (Xu, Yonggang); Wang, YS (Wang, Yishan); Tang, J (Tang, Jie); Zhao, W (Zhao, Wei); Duan, YX (Duan, Yixiang)
Source: PHYSICS OF PLASMAS  Volume: 27  Issue: 4  Article Number: 043501  DOI: 10.1063/1.5135973  Published: APR 2020  
Abstract: A two-dimensional fluid model was used to investigate the characteristics of a multiple-current-pulse dielectric barrier discharge (DBD) equipped with ring electrodes in helium at atmospheric pressure. The simulation results show that the discharge at peak moment follows the Townsend mode in the DBD with two current pulses in each half cycle. However, when there are three or four current pulses in each half cycle, the discharge mode at the first current peak transforms to the glow mode. Additionally, for the first and third current pulse, the breakdown first occurs in the radial center of the ring electrodes. But for the discharge in the second and fourth current pulse, it ignites from the periphery of the ring electrodes. Moreover, the discharge structure, i.e., the radial spatial distributions of current density, electron density, and electric field at peak moments, shows a feature of alternation between (1) higher current density, electron density, and electric field locating in the radial center of ring electrodes (center-advantage) and (2) higher current density, electron density, and electric field locating in the periphery of ring electrodes (periphery-advantage). This behavior is attributed to the fact that non-uniform surface charge accumulation during the previous discharge has different effects on the electric field in the gas gap in the subsequent discharge. Published under license by AIP Publishing.
Accession Number: WOS:000524405800004
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Tang, Jie    0000-0003-2162-6830 
ISSN: 1070-664X
eISSN: 1089-7674

Record 6 of 333
Title: Transparent and hydrophobic hexylene-bridged polymethylsiloxane/sio(2) composite coating with tunable refractive index and its application for broadband antireflection
Author(s): Zhang, C (Zhang, Ce); Xu, Y (Xu, Yao)
Source: THIN SOLID FILMS  Volume: 701  Article Number: 137944  DOI: 10.1016/j.tsf.2020.137944  Published: MAY 1 2020  
Abstract: Regulating refractive index over a wide range plays a key role in the design and fabrication of broadband antireflective coating in many optical energy-related fields. In this paper, hydrophobic refractive-tunable coating was fabricated from an effective solution mixing method starting from a synthesis solution of silica (SiO2) nanoparticles which was developed for dispersing nanoparticles into dense hexylene-bridged polymethylsiloxane polymer. In the mixing process, the microstructure and chemical structure of hexylene-bridged polymethylsiloxane/SiO2 were analyzed by fourier transform-infrared spectrometer and transmission electron microscope. Specially, the relationship between the microstructure and optical properties was also well investigated. Silica nanoparticles were dispersed homogeneously in polymer matrix modulating the refractive index of composite coating ranging from 1.16 to 1.47. When the composite coating with refractive index of 1.36 was used as the bottom layer and hexamethyldisilazane modified SiO2 coating with refractive index of 1.16 was used as the top layer. Thus-obtained double-layer broadband antireflective coating was fabricated with excellent broadband antireflective performance. In addition, the double-layer broadband silica antireflective coating showed good environmental stability. This work provides an alternative way to prepare a broadband antireflective coating for some applications in energy harvesting and optical devices.
Accession Number: WOS:000525745900022
Conference Title: 46th International Conference on Metallurgical Coatings and Thin Films (ICMCTF)
Conference Date: MAY 19-24, 2019
Conference Location: San Diego, CA
ISSN: 0040-6090

Record 7 of 333
Title: Relativistic near-single-cycle optical vortex pulses from noble gas-filled multipass cells
Author(s): Cao, HB (Cao, Huabao); Nagymihaly, RS (Nagymihaly, Roland S.); Kalashnikov, M (Kalashnikov, Mikhail)
Source: OPTICS LETTERS  Volume: 45  Issue: 12  DOI: 10.1364/OL.392394  Published: JUN 15 2020  
Abstract: We propose to obtain relativistic near-single-cycle optical vortices carrying orbital angular momentum through the post-compression of Laguerre-Gaussian pulses in gas-filled multipass cells. Our simulations revealed that 30 fs optical vortex pulses centered around 800 nm with a pulse energy of millijoule level can be compressed to near-single-cycle duration with topological charges from 1 to 20 within an argon-filled cell with five passes. The spectral broadening preserves the topological charge of the input beam; the spatio-spectral couplings are also discussed. The energy of the vortex pulses could be scaled up by increasing the dimensions of the cell. The relativistic near-single-cycle vortices are of great interest for the generation of ultrashort helical electron bunches based on hybrid electron acceleration in underdense plasmas and on isolated relativistic extreme ultraviolet optical vortices from high-order harmonic generation in solid foils. (C) 2020 Optical Society of America
Accession Number: WOS:000541729300016
PubMed ID: 32538952
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Kalashnikov, Mikhail  AAU-6956-2021   
ISSN: 0146-9592
eISSN: 1539-4794

Record 8 of 333
Title: Speed-up coherent Ising machine with a squeezed feedback system
Author(s): Luo, LHN (Luo, Lihaonan); Liu, HJ (Liu, Hongjun); Huang, N (Huang, Nan); Wang, ZL (Wang, Zhaolu)
Source: OPTICS EXPRESS  Volume: 28  Issue: 2  Pages: 1914-1926  DOI: 10.1364/OE.381850  Published: JAN 20 2020  
Abstract: As a solver for non-deterministic polynomial time (NP)-hard combinatorial optimization problems, the coherent Ising machine (CIM) is in the early stages of research, and the potential of this innovative physical system will be developed. Here, we propose a speed-up coherent Ising machine with a squeezed feedback system, which we call S-CIM. We couple squeezed feedback pulses generated by the squeezed feedback system into the degenerate optical parametric oscillator (DOPO) network. Simulations indicate that quantum inseparability of the coupled DOPO network is further enhanced during the whole optimization process, and quantum fluctuations are significantly smaller around the oscillation threshold. Computation experiments are performed on MAX-CUT problems of order between 4 and 20000. Numerical results demonstrate that S-CIM increases the optimal normalized output by 2.27% and significantly reduces the optimal computation time by 75.12%. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Accession Number: WOS:000513232200090
PubMed ID: 32121893
ISSN: 1094-4087

Record 9 of 333
Title: Hyperspectral imaging and analysis for sketch painting
Author(s): Wu, YH (Wu, Yinhua); Wang, PC (Wang, Pengchong); Wang, S (Wang, Shuang); Liu, J (Liu, Jun); Gao, M (Gao, Ming); Wei, RY (Wei, Ruyi); Gao, XH (Gao, Xiaohui)
Source: OPTIK  Volume: 212  Article Number: 164686  DOI: 10.1016/j.ijleo.2020.164686  Published: JUN 2020  
Accession Number: WOS:000542052800011
ISSN: 0030-4026
eISSN: 1618-1336

Record 10 of 333
Title: Phase-sensitive amplification of a QPSK signal using a dispersion engineered silicon-graphene oxide hybrid waveguide
Author(s): Chen, ZH (Chen, Zhihua); Liu, HJ (Liu, Hongjun); Wang, ZL (Wang, Zhaolu); Huang, N (Huang, Nan)
Source: APPLIED OPTICS  Volume: 59  Issue: 7  Pages: 1801-1807  DOI: 10.1364/AO.382778  Published: MAR 1 2020  
Abstract: We numerically investigate phase-sensitive amplification of a quadrature phase shift keying (QPSK) signal in a 35 mu m dispersion engineered silicon-graphene oxide hybrid waveguide. The four-wave mixing efficiency is effectively enhanced by exploiting the ultrahigh Kerr nonlinearity and low loss of graphene oxide in the ultrawide wavelength range. A new structure of dispersion flat silicon-graphene oxide hybrid waveguide is proposed and used to achieve the phase regeneration of a QPSK signal using a dual-conjugated-pump degenerate scheme. The phase-dependent gain and phase-to-phase transfer functions are calculated to analyze the properties of a phase-sensitive amplifier (PSA). The constellation diagrams of the QPSK signal and the error vector magnitude are used to assess the regeneration capacity. The simulation results show that the proposed PSA with a good phase noise squeezing capability has potential applications in all-optical signal processing. (C) 2020 Optical Society of America
Accession Number: WOS:000526525000006
PubMed ID: 32225694
ISSN: 1559-128X
eISSN: 2155-3165

Record 11 of 333
Title: Development of low-loss lead-germanate glass for mid-infrared fiber optics: I. glass preparation optimization
Author(s): Wang, PF (Wang, Pengfei); Bei, JF (Bei, Jiafang); Ahmed, N (Ahmed, Naveed); Ng, AKL (Ng, Alson Kwun Leung); Ebendorff-Heidepriem, H (Ebendorff-Heidepriem, Heike)
Source: JOURNAL OF THE AMERICAN CERAMIC SOCIETY  Volume: 104  Issue: 2  Pages: 860-876  DOI: 10.1111/jace.17503  Early Access Date: OCT 2020   Published: FEB 2021  
Abstract: Reducing the mid-infrared attenuation loss due to absorption of hydroxyl (OH) groups and scattering of metallic Pb species for lead-germanate glass is essential to pave the way for their applications as low-loss mid-infrared fiber optics. In the first part of this study, we report the understanding of the factors that determine dehydration efficiency and metallic Pb formation during the lead-germanate glassmelting process. Combining a dry O-2-rich atmosphere containing ultra-dry N(2)together with the use of chloride dehydration agent and nitrate oxidation agent compound was found to enable efficient dehydration effect and absence of metallic Pb scattering sources in the dehydrated glasses. This glassmelting procedure overcomes previous limitations on the preparation of similar kinds of heavy-metal oxide glasses, where only pure O(2)atmosphere was used and/or use of fluoride dehydration agent deteriorated the glass thermal stability. This work provides guidance for developing other low-loss mid-infrared glasses/fibers containing multivalent heavy-metal ions such as Pb, Bi, Te, Sb, etc
Accession Number: WOS:000575978300001
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Wang, Pengfei  D-7632-2012  0000-0002-5285-9832 
Ng, Alson    0000-0001-6644-629X 
ISSN: 0002-7820
eISSN: 1551-2916

Record 12 of 333
Title: Giant optical activity in plasmonic chiral structure via double-layer graphene moire stacking in mid-infrared region
Author(s): Chi, J (Chi, Jiao); Liu, HJ (Liu, Hongjun); Wang, ZL (Wang, Zhaolu); Huang, N (Huang, Nan)
Source: OPTICS EXPRESS  Volume: 28  Issue: 4  Pages: 4529-4540  DOI: 10.1364/OE.385450  Published: FEB 17 2020  
Abstract: The plasmonic metamaterials and metasurfaces play a critical role in manipulating lights in the mid-infrared spectral region. Here, we first propose a novel plasmonic chiral structure with the giant optical activity in the mid-infrared spectral region. The chiral structure consists of the moire patterns, which are formed by stacking double-layer graphene nanoribbons with a relative in-plane rotation angle. It is demonstrated that the graphene-based plasmonic structure with moire patterns exhibits the strong circular dichroism. The giant chiroptical response can be precisely controlled by changing the rotation angle and Fermi level of graphene. Furthermore, a dielectric interlayer is inserted between two layers of graphene to obtain the stronger circular dichroism. Impressively, the strongest circular dichroism can reach 5.94 deg at 13.6 mu m when the thickness of dielectric interlayer is 20 nm. The proposed structure with graphene-based moire patterns can be superior to conventional graphene chiral metamaterials due to some advantage of rotation-dependent chirality, flexible tunability and cost-effective fabrication. It will advance many essential mid-infrared applications, such as chiral sensors, thermal imaging and chiroptical detectors. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Accession Number: WOS:000514575500014
PubMed ID: 32121687
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
, Chi    0000-0002-0612-1431 
ISSN: 1094-4087

Record 13 of 333
Title: DM-SLAM: Monocular SLAM in Dynamic Environments
Author(s): Lu, XY (Lu, Xiaoyun); Wang, H (Wang, Hu); Tang, SM (Tang, Shuming); Huang, HM (Huang, Huimin); Li, C (Li, Chuang)
Source: APPLIED SCIENCES-BASEL  Volume: 10  Issue: 12  Article Number: 4252  DOI: 10.3390/app10124252  Published: JUN 2020  
Abstract: Many classic visual monocular SLAM (simultaneous localization and mapping) systems have been developed over the past decades, yet most of them fail when dynamic scenarios dominate. DM-SLAM is proposed for handling dynamic objects in environments based on ORB-SLAM2. This article mainly concentrates on two aspects. Firstly, we proposed a distribution and local-based RANSAC (Random Sample Consensus) algorithm (DLRSAC) to extract static features from the dynamic scene based on awareness of the nature difference between motion and static, which is integrated into initialization of DM-SLAM. Secondly, we designed a candidate map points selection mechanism based on neighborhood mutual exclusion to balance the accuracy of tracking camera pose and system robustness in motion scenes. Finally, we conducted experiments in the public dataset and compared DM-SLAM with ORB-SLAM2. The experiments corroborated the superiority of the DM-SLAM.
Accession Number: WOS:000549398100001
eISSN: 2076-3417

Record 14 of 333
Title: A propagation of interferogram signal-to-noise (SNR) and phase uncertainty in Doppler asymmetric spatial heterodyne spectrometer
Author(s): Sun, C (Sun Chen); Feng, YT (Feng Yu-Tao); Fu, D (Fu Di); Zhang, YF (Zhang Ya-Fei); Li, J (Li Juan); Liu, XB (Liu Xue-Bin)
Source: ACTA PHYSICA SINICA  Volume: 69  Issue: 1  Article Number: 014202  DOI: 10.7498/aps.69.20191179  Published: JAN 5 2020  
Abstract: Passive atmospheric wind detection technique retrieves atmospheric wind profile by measuring the Doppler shift of airglow emissions. Doppler asymmetric spatial heterodyne spectrometer (DASH), which is a Fourier transform spectrometer(FTS), retrieves the Doppler shift information of airglow emissions by detecting the phase shift of interferograms, and the measured phase accuracy directly affects the retrieved wind speed precision. The signal-to-noise (SNR) ratio is one of the significant indexes for evaluating the performance of wind-measuring interferometers in engineering applications. Studying the quantitative relationship between retrieved phase uncertainty and original interferogram SNR that is based on observations is quite essential for the DASH design, performance evaluation and wind profile applications. In this paper, the study is based on the noise propagation theory in FTS and DASH phase retrieval model. According to the Fourier transform relationship between time and frequency domain, we start from original interferogram expression, then we conduct the Fourier transforming, single frequency extracting, inverse Fourier transforming, phase calculating and first-order Taylor expanding, and finally we establish a theoretical relationship model between original interferogram SNR and retrieved phase uncertainty. In order to verify the theoretical relationship model, firstly, we generate 20 groups of interferograms (each group with 1000 frames) randomly with varying the 30-250 times SNR value. After removing the low frequency baseline, we calculate the phase of each interferogram by DASH phase retrieval model, and obtain the phase uncertainty by calculating standard deviation of the 512th sampling of each group interferogram. Another phase retrieval uncertainty is obtained by using the theoretical relationship model between SNR and retrieved phase uncertainty derived from this paper. Secondly, a total of 23 groups of experimental interferograms (each group with 100 frames) with different intensities are collected through the self-developed DASH with a center wavelength of 632.8 nm, basic optical path difference of 50 mm, spectral resolution of 0.78 cm(-1). Combining physical characteristics of shot noise and DASH parameters, interferogram SNR of each frame is calculated. We calculate phase uncertainty of experimental data through the two methods mentioned above. The results from the two different calculation methods are compared with each other to determine whether the conclusion is correct. In order to improve the accuracy of phase calculation, three lines are averaged as input to reduce the random error. The average residual between the two methods is only 0.03 mrad, the high consistency of the results indicates that the theoretical relationship model between SNR and retrieved phase uncertainty for DASH is correct. The phase uncertainty can be evaluated by interferogram SNR directly in engineering, which provides a theoretical basis for optimizing the interferometer design.
Accession Number: WOS:000505976500016
ISSN: 1000-3290

Record 15 of 333
Title: Multisource Compensation Network for Remote Sensing Cross-Domain Scene Classification
Author(s): Lu, XQ (Lu, Xiaoqiang); Gong, TF (Gong, Tengfei); Zheng, XT (Zheng, Xiangtao)
Source: IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING  Volume: 58  Issue: 4  Pages: 2504-2515  DOI: 10.1109/TGRS.2019.2951779  Published: APR 2020  
Abstract: Cross-domain scene classification refers to the scene classification task in which the training set (termed source domain) and the test set (termed target domain) come from different distributions. Various domain adaptation methods have been developed to reduce the distribution discrepancy between different domains. However, current domain adaptation methods assume that the source domain and target domain share the same categories. In reality, it is hard to find a source domain that can completely cover all the categories of target domain. In this article, we propose to use multiple complementary source domains to form the categories of target domain. A multisource compensation network (MSCN) is proposed to tackle these challenges: distribution discrepancy and category incompleteness. First, a pretrained convolutional neural network (CNN) is exploited to learn the feature representation for each domain. Second, a cross-domain alignment module is developed to reduce the domain shift between source and target domains. Domain shift is reduced by mapping the two domain features into a common feature space. Finally, a classifier complement module is proposed to align categories in multiple sources and learn a target classifier. Two cross-domain classification data sets are constructed using four heterogeneous remote sensing scene classification data sets. Extensive experiments are conducted on these datasets to validate the effectiveness of the proposed method. The proposed method can achieve 81.23 & x0025; and 81.97 & x0025; average accuracies on two-source-complementary data set and three-source-complementary data set, respectively.
Accession Number: WOS:000538748900019
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Lu, Xiaoqiang    0000-0002-7037-5188 
Gong, Tengfei    0000-0002-8465-0144 
ISSN: 0196-2892
eISSN: 1558-0644

Record 16 of 333
Title: Reconstruction of compressed video via non-convex minimization
Author(s): Ji, C (Ji, Chao); Tian, JS (Tian, Jinshou); Sheng, L (Sheng, Liang); He, K (He, Kai); Xin, LW (Xin, Liwei); Yan, X (Yan, Xin); Xue, YH (Xue, Yanhua); Zhang, MR (Zhang, Minrui); Chen, P (Chen, Ping); Wang, X (Wang, Xing)
Source: AIP ADVANCES  Volume: 10  Issue: 11  Article Number: 115207  DOI: 10.1063/5.0022860  Published: NOV 1 2020  
Abstract: This paper studies the sparsity prior to compressed video reconstruction algorithms. An effective non-convex 3DT(P)V regularization (0 < p < 1) is proposed for sparsity promotion. Based on the augmented Lagrangian reconstruction algorithm, this paper analyzes and compares three non-convex proximity operators for the lp-norm function, and numerous simulation results confirmed that the 3DT(P)V regularization can gain higher video reconstruction quality than the existing convex regularization and is more competitive than the existing video reconstruction algorithms.
Accession Number: WOS:000590780300002
eISSN: 2158-3226

Record 17 of 333
Title: Field experiment and analysis for free-space laser transmission characteristic in turbulent path based on MWIR and NIR
Author(s): Wang, W (Wang, Wei); Bai, ZF (Bai, Zhaofeng); Xie, XP (Xie, Xiaoping); Mei, HP (Mei, Haiping); Zhao, W (Zhao, Wei)
Source: MODERN PHYSICS LETTERS B  Volume: 34  Issue: 14  Article Number: 2050148  DOI: 10.1142/S0217984920501481  Published: MAY 20 2020  
Abstract: It is hard to achieve low bit error rate (BER) and high-quality signals in free-space optical (FSO) communication systems due to atmospheric link interference. For the sake of seeking solutions, we proposed an experimental scheme of free-space laser communication based on middle-wave infrared (MWIR) and near infrared (NIR) for obtaining atmospheric transmission characteristic in 1 km turbulence path. Compared with NIR waveband, MWIR-based scheme is more suitable for atmospheric FSO communication since it owns higher anti-interference ability for atmospheric attenuation, turbulence and skylight background noise. The experimental results may offer a significant reference for FSO communication in atmosphere link.
Accession Number: WOS:000537139300007
ISSN: 0217-9849
eISSN: 1793-6640

Record 18 of 333
Title: Catadioptric Optical System Design of 15-Magnitude Star Sensor with Large Entrance Pupil Diameter
Author(s): Bai, Y (Bai, Yang); Li, JL (Li, Jianlin); Zha, RW (Zha, Rongwei); Wang, Y (Wang, Ying); Lei, GZ (Lei, Guangzhi)
Source: SENSORS  Volume: 20  Issue: 19  Article Number: 5501  DOI: 10.3390/s20195501  Published: OCT 2020  
Abstract: The optical system is one of the core components for star sensors, whose imaging quality directly influences the performance of star sensors for star detection, thereby determining the attitude control accuracy of spacecrafts. Here, we report a new type of optical system with a catadioptric structure and a large entrance pupil diameter for a 15-magnitude star sensor. It consists of an improved Cassegrain system (R-C system), an aperture correction spherical lens group and a field of view correction spherical lens group. By embedding the secondary mirror of the R-C system into the output surface of the negative spherical lens of the aperture correction spherical lens group, the blocking of incident light is eliminated from the secondary mirror holder. After the structure optimization, the catadioptric optical system (COS) had a spectral range of 450 nm-950 nm, an entrance pupil diameter of 250 mm, a half-diagonal field of view of 1.4 degrees and a focal length of 390 mm. By using theoretical calculations and experimental measurements, it was verified that the COS, with the ability to correct astigmatism, lateral color and distortion, can fulfill the detection of 15-magnitude dark stars.
Accession Number: WOS:000587250900001
PubMed ID: 32992859
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
li, jianlin    0000-0002-8424-2239 
Bai, Yang    0000-0002-5494-6155 
zha, rongwei    0000-0003-2242-0930 
wang, yi    0000-0002-1029-5004 
eISSN: 1424-8220

Record 19 of 333
Title: 2D molybdenum carbide (Mo2C)/fluorine mica (FM) saturable absorber for passively mode-locked erbium-doped all-fiber laser
Author(s): Liu, SC (Liu, Sicong); Wang, YG (Wang, Yonggang); Lv, RD (Lv, Ruidong); Wang, J (Wang, Jiang); Wang, HZ (Wang, Huizhong); Wang, Y (Wang, Yun); Duan, LN (Duan, Lina)
Source: NANOPHOTONICS  Volume: 9  Issue: 8  Special Issue: SI  Pages: 2523-2530  DOI: 10.1515/nanoph-2020-0019  Published: AUG 2020  
Abstract: As a new member of saturable absorber (SA), molybdenum carbide (Mo2C) has some excellent optical properties. Herein, we report a new type of Mo2C/fluorine mica (FM) SA device. Uniform and compact Mo2C films were deposited on the FM by magnetron sputtering method. In order to increase the laser damage threshold, an additional protective layer of silicon oxide was deposited on the Mo2C. The FM is a single-layer structure of 20 mu m, and its high elasticity makes it not easy to fracture. The transmission rate of FM is as high as 90% at near infrared wavelength. FM has better heat dissipation and softening temperature than organic composite materials, so it can withstand higher laser power without being damaged. In this work, Mo2C/FM SA was cut into small pieces and inserted into erbium-doped fiber laser to achieve mode-locked operation. The pulse duration and average output power of the laser pulses were 313 fs and 64.74 mW, respectively. In addition, a 12th-order sub-picosecond harmonic mode-locking was generated. The maximum repetition rate was 321.6 MHz and the shortest pulse duration was 338 fs. The experimental results show that Mo2C/FM SA is a broadband nonlinear optical mode-locker with excellent performance.
Accession Number: WOS:000549189300032
ISSN: 2192-8606
eISSN: 2192-8614

Record 20 of 333
Title: Lensless Computational Imaging Technology Using Deep Convolutional Network
Author(s): Chen, PD (Chen, Peidong); Su, XQ (Su, Xiuqin); Liu, MY (Liu, Muyuan); Zhu, WH (Zhu, Wenhua)
Source: SENSORS  Volume: 20  Issue: 9  Article Number: 2661  DOI: 10.3390/s20092661  Published: MAY 2020  
Abstract: Within the framework of Internet of Things or when constrained in limited space, lensless imaging technology provides effective imaging solutions with low cost and reduced size prototypes. In this paper, we proposed a method combining deep learning with lensless coded mask imaging technology. After replacing lenses with the coded mask and using the inverse matrix optimization method to reconstruct the original scene images, we applied FCN-8s, U-Net, and our modified version of U-Net, which is called Dense-U-Net, for post-processing of reconstructed images. The proposed approach showed supreme performance compared to the classical method, where a deep convolutional network leads to critical improvements of the quality of reconstruction.
Accession Number: WOS:000537106200225
PubMed ID: 32384807
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
, Wenhua    0000-0003-0887-0038 
Chen, Peidong    0000-0003-0356-5587 
eISSN: 1424-8220

Record 21 of 333
Title: A Joint Relationship Aware Neural Network for Single-Image 3D Human Pose Estimation
Author(s): Zheng, XT (Zheng, Xiangtao); Chen, XM (Chen, Xiumei); Lu, XQ (Lu, Xiaoqiang)
Source: IEEE TRANSACTIONS ON IMAGE PROCESSING  Volume: 29  Pages: 4747-4758  DOI: 10.1109/TIP.2020.2972104  Published: 2020  
Abstract: This paper studies the task of 3D human pose estimation from a single RGB image, which is challenging without depth information. Recently many deep learning methods are proposed and achieve great improvements due to their strong representation learning. However, most existing methods ignore the relationship between joint features. In this paper, a joint relationship aware neural network is proposed to take both global and local joint relationship into consideration. First, a whole feature block representing all human body joints is extracted by a convolutional neural network. A Dual Attention Module (DAM) is applied on the whole feature block to generate attention weights. By exploiting the attention module, the global relationship between the whole joints is encoded. Second, the weighted whole feature block is divided into some individual joint features. To capture salient joint feature, the individual joint features are refined by individual DAMs. Finally, a joint angle prediction constraint is proposed to consider local joint relationship. Quantitative and qualitative experiments on 3D human pose estimation benchmarks demonstrate the effectiveness of the proposed method.
Accession Number: WOS:000526697100007
PubMed ID: 32070954
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Lu, Xiaoqiang    0000-0002-7037-5188 
Chen, Xiumei    0000-0002-0610-990X 
ISSN: 1057-7149
eISSN: 1941-0042

Record 22 of 333
Title: Deep Cross-Modal ImageVoice Retrieval in Remote Sensing
Author(s): Chen, YX (Chen, Yaxiong); Lu, XQ (Lu, Xiaoqiang); Wang, S (Wang, Shuai)
Source: IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING  Volume: 58  Issue: 10  Pages: 7049-7061  DOI: 10.1109/TGRS.2020.2979273  Published: OCT 2020  
Abstract: With the rapid progress of satellite and aircraft technologies, cross-modal remote sensing imagevoice retrieval has been studied in geography recently. However, there still exist some bottlenecks: how to consider the characteristics of remote sensing data adequately and how to reduce the memory and improve the retrieval efficiency in large-scale remote sensing data. In this article, we propose a novel deep cross-modal remote sensing imagevoice retrieval approach, namely, deep imagevoice retrieval (DIVR), to capture more information of remote sensing data to generate hash codes with low memory and fast retrieval properties. Especially, the DIVR approach proposes inception dilated convolution module to capture multiscale contextual information of remote sensing images and voices. Moreover, in order to enhance cross-modal similarity, the deep features similarity term is designed to make paired similar deep features as close as possible and paired dissimilar deep features as mutually far as possible. In addition, the quantization error term is designed to drive hash-like codes to approximate hash codes, which can effectively reduce the quantization error for hash codes learning. Extensive experimental results on three remote sensing imagevoice data sets show that the proposed DIVR approach can outperform other cross-modal retrieval approaches.
Accession Number: WOS:000573923100021
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Chen, Yaxiong  AAR-7285-2020   
Lu, Xiaoqiang    0000-0002-7037-5188 
Chen, Yaxiong    0000-0002-2903-6723 
ISSN: 0196-2892
eISSN: 1558-0644

Record 23 of 333
Title: A Deep Hashing Technique for Remote Sensing Image-Sound Retrieval
Author(s): Chen, YX (Chen, Yaxiong); Lu, XQ (Lu, Xiaoqiang)
Source: REMOTE SENSING  Volume: 12  Issue: 1  Article Number: 84  DOI: 10.3390/rs12010084  Published: JAN 2020  
Abstract: With the rapid progress of remote sensing (RS) observation technologies, cross-modal RS image-sound retrieval has attracted some attention in recent years. However, these methods perform cross-modal image-sound retrieval by leveraging high-dimensional real-valued features, which can require more storage than low-dimensional binary features (i.e., hash codes). Moreover, these methods cannot directly encode relative semantic similarity relationships. To tackle these issues, we propose a new, deep, cross-modal RS image-sound hashing approach, called deep triplet-based hashing (DTBH), to integrate hash code learning and relative semantic similarity relationship learning into an end-to-end network. Specially, the proposed DTBH method designs a triplet selection strategy to select effective triplets. Moreover, in order to encode relative semantic similarity relationships, we propose the objective function, which makes sure that that the anchor images are more similar to the positive sounds than the negative sounds. In addition, a triplet regularized loss term leverages approximate l(1)-norm of hash-like codes and hash codes and can effectively reduce the information loss between hash-like codes and hash codes. Extensive experimental results showed that the DTBH method could achieve a superior performance to other state-of-the-art cross-modal image-sound retrieval methods. For a sound query RS image task, the proposed approach achieved a mean average precision (mAP) of up to 60.13% on the UCM dataset, 87.49% on the Sydney dataset, and 22.72% on the RSICD dataset. For RS image query sound task, the proposed approach achieved a mAP of 64.27% on the UCM dataset, 92.45% on the Sydney dataset, and 23.46% on the RSICD dataset. Future work will focus on how to consider the balance property of hash codes to improve image-sound retrieval performance.
Accession Number: WOS:000515391700084
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Chen, Yaxiong  AAR-7285-2020   
Chen, Yaxiong    0000-0002-2903-6723 
eISSN: 2072-4292

Record 24 of 333
Title: Long-distance ranging with high precision using a soliton microcomb
Author(s): Wang, JD (Wang, Jindong); Lu, ZZ (Lu, Zhizhou); Wang, WQ (Wang, Weiqiang); Zhang, FM (Zhang, Fumin); Chen, JW (Chen, Jiawei); Wang, Y (Wang, Yang); Zheng, JH (Zheng, Jihui); Chu, ST (Chu, Sai T.); Zhao, W (Zhao, Wei); Little, BE (Little, Brent E.); Qu, XH (Qu, Xinghua); Zhang, WF (Zhang, Wenfu)
Source: PHOTONICS RESEARCH  Volume: 8  Issue: 12  Pages: 1964-1972  DOI: 10.1364/PRJ.408923  Published: DEC 1 2020  
Abstract: Laser-based light detection and ranging (lidar) plays a significant role in both scientific and industrial areas. However, it is difficult for existing lidars to achieve high speed, high precision, and long distance simultaneously. Here, we demonstrate a high-performance lidar based on a chip-scaled soliton microcomb (SMC) that can realize all three specialties simultaneously. Aided by the excellent properties of ultrahigh repetition rate and the smooth envelope of the SMC, traditional optical frequency comb (OFC)-based dispersive interferometry is heavily improved and the measuring dead zone induced by the mismatch between the repetition rate of the OFC and resolution of the optical spectrum analyzer is totally eliminated. Combined with an auxiliary dual-frequency phase-modulated laser range finder, the none-dead-zone measurable range ambiguity is extended up to 1500 m. The proposed SMC lidar is experimentally implemented in both indoor and outdoor environment. In the outdoor baseline field, real-time, high-speed (up to 35 kHz) measurement of a long distance of similar to 1179 m is achieved with a minimum Allan deviation of 5.6 mu m at an average time of 0.2 ms (27 nm at an average time of 1.8 s after high-pass filtering). The present SMC lidar approaches a compact, fast, high-precision, and none-dead zone long-distance ranging system, aimed at emerging applications of frontier basic scientific research and advances in industrial manufacturing. (C) 2020 Chinese Laser Press
Accession Number: WOS:000595832200020
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Chu, Sai T  D-3312-2014  0000-0001-8263-8507 
Wang, Jin-dong    0000-0001-7789-3204 
ISSN: 2327-9125

Record 25 of 333
Title: Graphene-assisted high-precision temperature sensing by long-period fiber gratings
Author(s): Wang, RD (Wang, Ruiduo); Ren, ZY (Ren, Zhaoyu); Kong, XD (Kong, Xudong); Kong, DP (Kong, Depeng); Hu, BW (Hu, Baowen); He, ZQ (He, Zhengquan)
Source: JOURNAL OF PHYSICS D-APPLIED PHYSICS  Volume: 53  Issue: 6  Article Number: 065104  DOI: 10.1088/1361-6463/ab5498  Published: FEB 6 2020  
Abstract: The tapered long-period fiber grating (TLPFG) and rotated chiral long-period fiber gratings (CLPFG) heated by a CO2 laser were fabricated by periodically tapering and rotating standard single-mode fibers (SMF). The temperature sensing characteristics of the TLPFG and CLPFG between 30 degrees C and 60 degrees C were experimentally investigated, and the slopes of the wavelength shift corresponded to 0.115 nm degrees C-1 and 0.04 nm degrees C-1, respectively. The graphene films were coated on gratings to fabricate graphene-coated TLPFG (GTLPFG) and graphene-coated CLPFG (GCLPFG). Given the thermal effects of graphene, the slopes of the resonance dip shift of the GTLPFG and GCLPFG between 30 degrees C and 60 degrees C increased to 0.196 nm degrees C-1 and 0.113 nm degrees C-1, respectively. Additionally, the high temperature sensing properties of TLPFG and CLPFG between 100 degrees C and 1000 degrees C were investigated. The slopes of the higher-order resonance dips of the TLPFG and CLPFG corresponded to 0.119 nm degrees C-1 and 0.09 nm degrees C-1, respectively, during the heating process, and to 0.116 degrees C-1 and 0.09 nm degrees C-1, respectively, during the cooling process. In the low and high temperature zones, the TLPFG exhibited higher sensitivity when compared to that of the CLPFG, while the CLPFG exhibited higher sensing precision with linearity approaching 1. Given the simple and unsophisticated fabrication process and the high quality and sensitivity of the fabricated gratings, the proposed sensors can play an important role in high-precision temperature-sensing applications.
Accession Number: WOS:000526829200004
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
kong, de peng    0000-0003-3359-5517 
Wang, Ruiduo    0000-0003-4420-4737 
ISSN: 0022-3727
eISSN: 1361-6463

Record 1 of 333
Title: Temperature-Dependent Analysis of Solid-State Photon-Enhanced Thermionic Emission Solar Energy Converter
Author(s): Yang, Y (Yang, Yang); Cao, WW (Cao, Wei Wei); Xu, P (Xu, Peng); Zhu, BL (Zhu, Bing Li); Bai, YL (Bai, Yong Lin); Wang, B (Wang, Bo); Qin, JJ (Qin, Jun Jun); Bai, XH (Bai, Xiao Hong)
Source: ENERGIES  Volume: 13  Issue: 7  Article Number: 1554  DOI: 10.3390/en13071554  Published: APR 2020  
Abstract: Solid-state photon-enhanced thermionic emission (PETE) solar energy converters are newly proposed devices that can directly convert solar energy into electrical power at high temperatures. An analytical model based on a one-dimensional steady-state equation is developed to analyze the temperature-dependent performance of the solid-state PETE converter. The treatment used to derive the reverse saturation current density (J(0)) and open-circuit voltage (V-oc) of the solid-state PETE converter is similar to that used in photovoltaic cells. Thus, their performances at elevated temperatures can be compared. Analysis results show that J(0) of the solid-state PETE converter with a GaAs absorption layer is approximately three orders of magnitude lower, and the decrease rate of open-circuit voltage (-dV(oc)/dT) is smaller than that of a practical GaAs photovoltaic cell. The improved performance of the solid-state PETE converter at high temperatures is attributed to the simultaneous use of diffusion and ballistic transport to harvest photo-generated electrons. The results presented in this paper demonstrate that, besides using wide bandgap materials and increasing doping density, harvesting solar energy via PETE effect can effectively improve the performance of solar cells at elevated temperatures.
Accession Number: WOS:000537688400023
eISSN: 1996-1073

Record 2 of 333
Title: Time-Dependent Global Nonsingular Fixed-Time Terminal Sliding Mode Control-Based Speed Tracking of Permanent Magnet Synchronous Motor
Author(s): Wu, SB (Wu, Shaobo); Su, XQ (Su, Xiuqin); Wang, KD (Wang, Kaidi)
Source: IEEE ACCESS  Volume: 8  Pages: 186408-186420  DOI: 10.1109/ACCESS.2020.3030279  Published: 2020  
Abstract: This paper studies global nonsingular fixed-time terminal sliding mode control (GNFTSMC) for a second-order uncertain permanent magnet synchronous motor (PMSM) system to further improve its speed tracking performance. The newly proposed GNFTSMC consists of a time-dependent terminal sliding surface and a piecewise continuous sliding mode control law. By a time-dependent function constructed from the initial conditions of the system and a predefined time, the sliding surface is always reached at the initial instant and forced to a traditional fast terminal sliding surface after the predefined time. Based on Filippov's stability principles, the globally fixed-time stability of the GNFTSMC is proved. Furthermore, a priori time independent of the initial conditions is derived to estimate the boundary of the settling time of the closed control loop. Then, the control law is analyzed to be always nonsingular. Thus, the GNFTSMC-based speed controller for the PMSM speed tracking system is developed. Finally, simulations are conducted for the proposed controller and other terminal sliding mode controllers. The results show that compared to the other controllers, the PMSM system based on GNFTSMC displays improved performance characteristics of faster speed response, smaller chattering and higher current efficiency.
Accession Number: WOS:000583574500001
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Su, Xiuqin    0000-0002-6554-2762 
Wang, Kaidi    0000-0001-8145-5530 
ISSN: 2169-3536

Record 3 of 333
Title: Tunable Bound States in the Continuum in All-Dielectric Terahertz Metasurfaces
Author(s): Chen, X (Chen, Xu); Fan, WH (Fan, Wenhui)
Source: NANOMATERIALS  Volume: 10  Issue: 4  Article Number: 623  DOI: 10.3390/nano10040623  Published: APR 2020  
Abstract: In this paper, a tunable terahertz dielectric metasurfaces consisting of split gap bars in the unit cell is proposed and theoretically demonstrated, where the sharp high-quality Fano resonance can be achieved through excitation of quasi-bound states in the continuum (quasi-BIC) by breaking in-plane symmetry of the unit cell structure. With the structural asymmetry parameter decreasing and vanishing, the calculated eigenmodes spectra demonstrate the resonance changes from Fano to symmetry-protected BIC mode, and the radiative quality factors obey the inverse square law. Moreover, combining with graphene monolayer and strontium titanate materials, the quasi-BIC Fano resonance can be tuned independently, where the resonance amplitude can be tuned by adjusting the Fermi level of graphene and the resonance frequency can be tuned by controlling the temperature of strontium titanate materials. The proposed structure has numerous potential applications on tunable devices including modulators, switches, and sensors.
Accession Number: WOS:000539577200026
PubMed ID: 32230957
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Fan, Wen-Hui  M-1060-2018  0000-0003-2554-6723 
eISSN: 2079-4991

Record 4 of 333
Title: Photonic crystal rod-based high-performance ultrafast fiber laser system
Author(s): Lv, ZG (Lv, Zhiguo); Yang, Z (Yang, Zhi); Li, QL (Li, Qianglong); Li, F (Li, Feng); Wang, YS (Wang, Yishan); Zhao, W (Zhao, Wei); Yang, XJ (Yang, Xiaojun)
Source: HIGH POWER LASER SCIENCE AND ENGINEERING  Volume: 8  Article Number: e40  DOI: 10.1017/hpl.2020.42  Published: DEC 1 2020  
Abstract: In this paper, we innovatively conduct a Porro prism-based beam pointing stability promotion technique research and realize a high-performance rod-type photonic crystal fiber-based chirped pulse amplification (CPA) system, mainly including a frequency-reduced all-fiber pre-amplification stage, photonic crystal rod-based main amplification stage, and 1600 lines/mm transmission grating-pair compressor. Laser output with average power of 50 W, repetition rates of 500 kHz, pulse energy of 100 mu J, pulse duration of 830 fs, beam quality of M-2<1.3, power fluctuation of 0.55% root mean square, and beam pointing drift of 19 mu rad/degrees C over 8 h is realized. The high-performance laser system has an enormous application potential in fundamental research and precision manufacturing fields.
Accession Number: WOS:000596505800001
ISSN: 2095-4719
eISSN: 2052-3289

Record 5 of 333
Title: 5 Gbaud QPSK coherent transmission in the mid-infrared
Author(s): Wang, W (Wang, Wei); Zheng, YQ (Zheng, Yunqiang); Xie, XP (Xie, Xiaoping); Su, YL (Su, Yulong); Huang, XN (Huang, Xinning); Duan, T (Duan, Tao); Zhao, W (Zhao, Wei)
Source: OPTICS COMMUNICATIONS  Volume: 466  Article Number: 125681  DOI: 10.1016/j.optcom.2020.125681  Published: JUL 1 2020  
Abstract: We experimentally demonstrate a high-speed mid-infrared (MIR) transmission system with a 5 Gbaud quadrature phase shift keying (QPSK) modulation over free space optical (FSO) link. The MIR system operates through homemade robust and compact MIR transmitter and receiver devices, which has the ability to achieve wavelength conversion between C-band and MIR based on difference frequency generation (DFG) process. The wavelength and power of MIR signal generated from MIR transmitter are 3.57 dBm and 3594 nm, and the C-band signal regenerated from MIR receiver are -26.12 dBm and 1550.116 nm. Both the constellation diagrams and eye diagrams of regenerated C-band signal are clear when the input power of C-band receiver is higher than -40 dBm. Compared with the back to back (BTB) transmission system, the power penalty of the MIR transmission system is less than 2.8 dB measured at bit error ratio (BER) of 1x10(-7). It can be concluded from the experimental results that the MIR transmission system supports high-speed data rate, variable wavelength and high-order modulation format, and has the potential to be applied to FSO communications or satellite communications in atmospheric environments.
Accession Number: WOS:000528945600015
ISSN: 0030-4018
eISSN: 1873-0310

Record 6 of 333
Title: High-Performance Microring Resonator Ge-on-Si Photodetectors by Optimizing Absorption Layer Length
Author(s): Cui, JS (Cui, Jishi); Li, TT (Li, Tiantian); Chen, HM (Chen, Hongmin); Cui, WJ (Cui, Wenjing)
Source: IEEE PHOTONICS JOURNAL  Volume: 12  Issue: 4  DOI: 10.1109/JPHOT.2020.3010502  Published: AUG 2020  
Abstract: We studied the relationship between the absorption layer length and the performance of Ge-on-Si microring resonator photodetectors. The principle of optimizing the absorption layer length based on the light field distribution was proposed. In the Ge-on-Si photodetectors, the transmission light field is alternately distributed among the germanium absorption layer and the silicon waveguide layer, and gradually absorbed by the germanium layer. For the Ge-on-Si microring resonator photodetectors, the length of the germanium absorption layer should be set to achieve the maximum light field distribution in the silicon layer at the end of the photodetector, then the remaining optical power can be coupled back to the silicon waveguide and transmit in the microring for absorption again. We demonstrated by simulation that, the device with optimized length of 11 mu m has larger bandwidth, smaller dark current, and higher responsivity than the device with 14 mu m absorption layer by simulation @1550nm.
Accession Number: WOS:000557348600003
ISSN: 1943-0655
eISSN: 1943-0647

Record 7 of 333
Title: Simulation and experiment of X-ray communication in re-entry dusty plasma region
Author(s): Li, Y (Li, Yao); Su, T (Su, Tong); Sheng, LZ (Sheng, Lizhi); Xu, N (Xu, Neng); Zhao, BS (Zhao, Baosheng)
Source: MODERN PHYSICS LETTERS B  Volume: 34  Issue: 4  Article Number: 2050057  DOI: 10.1142/S0217984920500578  Published: FEB 10 2020  
Abstract: Compared with the other wireless communication band, X-ray carrier has the merits of lower wavelength, higher frequency and photon energy, which could provide a novel method to solve the communication problems of re-entry blackout region. In this paper, transmission characteristics of X-ray carrier in the re-entry dusty plasma medium were analyzed first, simulation results indicate that dusty particles were more likely to impede the microwave signal than X-ray carrier. Then an alkali metal plasma source was designed to simulate the re-entry dusty plasma sheath for simplification. Transmission co-efficiency under different X-ray energy were tested, which pointed out that X-ray signal would obtain more than 79.4% transmission co-efficiency on condition of dynamic and dusty plasma medium. Finally, we give our proposal and potential capability of X-ray communication in the re-entry plasma condition.
Accession Number: WOS:000514154000009
ISSN: 0217-9849
eISSN: 1793-6640

Record 8 of 333
Title: Discrete Deep Hashing With Ranking Optimization for Image Retrieval
Author(s): Lu, XQ (Lu, Xiaoqiang); Chen, YX (Chen, Yaxiong); Li, XL (Li, Xuelong)
Source: IEEE TRANSACTIONS ON NEURAL NETWORKS AND LEARNING SYSTEMS  Volume: 31  Issue: 6  Pages: 2052-2063  DOI: 10.1109/TNNLS.2019.2927868  Published: JUN 2020  
Abstract: For large-scale image retrieval task, a hashing technique has attracted extensive attention due to its efficient computing and applying. By using the hashing technique in image retrieval, it is crucial to generate discrete hash codes and preserve the neighborhood ranking information simultaneously. However, both related steps are treated independently in most of the existing deep hashing methods, which lead to the loss of key category-level information in the discretization process and the decrease in discriminative ranking relationship. In order to generate discrete hash codes with notable discriminative information, we integrate the discretization process and the ranking process into one architecture. Motivated by this idea, a novel ranking optimization discrete hashing (RODH) method is proposed, which directly generates discrete hash codes (e.g., +1/-1) from raw images by balancing the effective category-level information of discretization and the discrimination of ranking information. The proposed method integrates convolutional neural network, discrete hash function learning, and ranking function optimizing into a unified framework. Meanwhile, a novel loss function based on label information and mean average precision (MAP) is proposed to preserve the label consistency and optimize the ranking information of hash codes simultaneously. Experimental results on four benchmark data sets demonstrate that RODH can achieve superior performance over the state-of-the-art hashing methods.
Accession Number: WOS:000542953000022
PubMed ID: 31398137
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Chen, Yaxiong  AAR-7285-2020   
Li, Xuelong  ABF-3381-2020   
Chen, Yaxiong    0000-0002-2903-6723 
Lu, Xiaoqiang    0000-0002-7037-5188 
ISSN: 2162-237X
eISSN: 2162-2388

Record 9 of 333
Title: Wavelength locking in a large-smile diode-laser array using dual-beam transformation systems
Author(s): Liu, B (Liu, Bin); Liu, H (Liu, Hui); Chen, FN (Chen, Fenning); Li, HY (Li, Haiyan); Liu, XS (Liu, Xingsheng)
Source: APPLIED OPTICS  Volume: 59  Issue: 11  Pages: 3399-3403  DOI: 10.1364/AO.388241  Published: APR 10 2020  
Abstract: Dual-beam transformation systems (dualBTSs) are used to obtain a wide wavelength-locking range for high-power large-smile diode-laser arrays. The collimating residual divergence angle can be reduced from 9 mrad to less than 6.5 mrad using a set of two angled BTSs that are located in front of a diode-laser array with about a 2 mu m smile. Due to the reduced collimating residual divergence angle, the external cavity with a set of two angled BTSs and a volume Bragg grating achieved a wide wavelength-locking range for temperatures ranging from 20 degrees C to 30 degrees C. In addition, the side-mode suppression ratio exceeds 30 dB. (C) 2020 Optical Society of America
Accession Number: WOS:000526532600013
PubMed ID: 32400451
ISSN: 1559-128X
eISSN: 2155-3165

Record 10 of 333
Title: Simultaneous optical trapping and imaging in the axial plane: a review of current progress
Author(s): Liang, YS (Liang, Yansheng); Yan, SH (Yan, Shaohui); Wang, ZJ (Wang, Zhaojun); Li, RZ (Li, Runze); Cai, YN (Cai, Yanan); He, MR (He, Minru); Yao, BL (Yao, Baoli); Lei, M (Lei, Ming)
Source: REPORTS ON PROGRESS IN PHYSICS  Volume: 83  Issue: 3  Article Number: 032401  DOI: 10.1088/1361-6633/ab7175  Published: MAR 2020  
Abstract: Optical trapping has become a powerful tool in numerous fields such as biology, physics, chemistry, etc. In conventional optical trapping systems, trapping and imaging share the same objective lens, confining the region of observation to the focal plane. For the capture of optical trapping processes occurring in other planes, especially the axial plane (the one containing the z-axis), many methods have been proposed to achieve this goal. Here, we review the methods of acquiring the axial-plane information from which axial plane trapping is observed and discuss their advantages and limitations. To overcome the limitations existing in these methods, we developed an optical tweezers system that allows for simultaneous optical trapping and imaging in the axial plane. The versatility and usefulness of the system in axial-plane trapping and imaging are demonstrated by investigating its trapping performance with various optical fields, including Bessel, Airy, and snake-like beams. The potential applications of the reported technique are suggested to several research fields, including optical pulling, longitudinal optical binding, tomographic phase microscopy (TPM), and super-resolution microscopy.
Accession Number: WOS:000517443400001
PubMed ID: 31995793
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Yao, Baoli  AAB-4606-2021   
Yan, Shaohui    0000-0003-3983-7206 
Liang, Yansheng    0000-0002-3561-1317 
ISSN: 0034-4885
eISSN: 1361-6633

Record 11 of 333
Title: Real-time long-term tracker with tracking-verification-detection-refinement
Author(s): Liao, JW (Liao, Jiawen); Qi, C (Qi, Chun); Cao, JZ (Cao, Jianzhong); Ren, L (Ren, Long); Zhang, GP (Zhang, Gaopeng)
Source: JOURNAL OF VISUAL COMMUNICATION AND IMAGE REPRESENTATION  Volume: 72  Article Number: 102896  DOI: 10.1016/j.jvcir.2020.102896  Published: OCT 2020  
Abstract: Long-term tracking is one of the most challenging problems in computer vision. In this paper, we make full use of the Discriminative Correlation Filter (DCF), and propose a real-time long-term tracker by exploiting a joint tracking-verification-detection-refinement framework. We utilize a DCF which is updated aggressively to estimate translation and scale variation of the target. Subsequently, a passively updated DCF checks the reliability of the tracking result. Once the result is not reliable, we evoke the proposed optimized candidate detector to generate a small number of relatively high quality candidates. Finally, one DCF with an adaptive online learning rate is adopted to refine the predictions that the sparse candidates inferred. In addition, we employ a selection mechanism for the correlation responses to maintain reliable samples effectively. Extensive experiments show that the proposed method performs favorably against lots of state-of-the-art methods while running more than 30 frames per second on single CPU.
Accession Number: WOS:000579732400012
ISSN: 1047-3203
eISSN: 1095-9076

Record 12 of 333
Title: Material removal behaviour in axial ultrasonic assisted scratching of Zerodur and ULE with a Vickers indenter
Author(s): Sun, GY (Sun, Guoyan); Shi, F (Shi, Feng); Zhao, QL (Zhao, Qingliang); Ma, Z (Ma, Zhen); Yang, DL (Yang, Donglai)
Source: CERAMICS INTERNATIONAL  Volume: 46  Issue: 10  Pages: 14613-14624  DOI: 10.1016/j.ceramint.2020.02.262  Part: A  Published: JUL 2020  
Abstract: Compared to conventional grinding, axial ultrasonic vibration-assisted peripheral grinding (AUPG) has advantages in terms of the improved grinding quality, higher efficiency, as well as lowered brittle damages. However, the present studies on material removal mechanism of AUPG are still not sufficient which thereafter limit its application potential. This paper aims to investigate the material removal mechanism of Zerodur and ULE through scratching by using a Vickers indenter under two conditions, with (ultrasonic vibration-assisted scratching (UVS)) and without (conventional scratching (CS)) axial ultrasonic vibration-assisted scratching while the other scratching parameters are identical. The indenter's kinematic characteristic, scratched morphology, scratched groove dimensions and critical depth of cut are compared in between UVS and CS. The experimental results indicate that the dynamic contact length between indenter and workpiece for UVS is remarkable longer than that for CS, which is helpful to promote the crack interference and hence to increase the proportion of ductile material removal mode, resulting in the diminishment of brittle fracture size in UVS. The propagation direction of median cracks in CS are relatively consistent, while in UVS the periodic varied contact zone and contact force in between the indenter and workpiece could promote the cracks propagating in different orientations, and then to improve the material removals rate in UVS. Moreover, both the critical brittle-ductile transition depth of cut and critical brittle depth of cut in UVS are bigger than that in CS, meaning the material removed in UVS with a bigger ductile ratio leading to a decreased brittle damage depth. In addition, the different material removal behaviours between Zerodur and ULE are also investigated. This fundamental work lays a theoretical foundation for the technological development and broad application of hard/brittle material oriented AUPG, as well as poses a meaningful guidance for the ultrasonic vibration assisted grinding on low-expansion optical glasses.
Accession Number: WOS:000533511200033
ISSN: 0272-8842
eISSN: 1873-3956

Record 13 of 333
Title: A new phase retrieval method using sequential phase modulations
Author(s): Chen, XY (Chen, Xiaoyi); Duan, YX (Duan, Yaxuan); Li, HG (Li, Hongguang); Wang, P (Wang, Pu); Li, M (Li, Ming); Da, ZS (Da, Zhengshang)
Source: APPLIED PHYSICS B-LASERS AND OPTICS  Volume: 126  Issue: 5  Article Number: 77  DOI: 10.1007/s00340-020-7417-3  Published: APR 4 2020  
Abstract: In this paper, a new phase retrieval method using sequential phase modulations is proposed. Behind the unknown object, adding sequential phase modulations will change the diffraction intensities received by sensor. Through increasing the number of diffraction intensities patterns, the difficulty of retrieving the unknown object is decreased. To better select these modulation phases, the complexity parameter is defined to evaluate the complexity of unknown object. When the complexity parameter of unknown object is larger, it contains more spectrum information on different frequency bands and will be harder to retrieve. The complexity of unknown object should be contained between the maximum and minimum complexities of modulation phases. In this way, the information of each frequency band on the unknown object can be effectively retrieved. Meanwhile, the distribution of modulation phases should be continuous to avoid introducing high frequency noise. In addition, there is no limit on what kind of modulation phase distribution to choose. The effectiveness and fast convergence of this new method has been proved.
Accession Number: WOS:000523275100001
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Duan, Yaxuan    0000-0002-3619-405X 
ISSN: 0946-2171
eISSN: 1432-0649

Record 14 of 333
Title: Deep discrete hashing with pairwise correlation learning
Author(s): Chen, YX (Chen, Yaxiong); Lu, XQ (Lu, Xiaoqiang)
Source: NEUROCOMPUTING  Volume: 385  Pages: 111-121  DOI: 10.1016/j.neucom.2019.12.078  Published: APR 14 2020  
Abstract: Hashing technology plays an important role in large-scale visual search due to its low memory and fast retrieval speed. Most existing deep hashing approaches first leverage the continuous relaxation strategy to learn continuous approximate codes, and then transform them into discrete hash codes by separating quantization operations, which results in the suboptimal problem of hash codes and ultimately affects the performance of image retrieval. To solve this problem, we propose a novel deep discrete hashing approach with pairwise labels, namely Pairwise Correlation Discrete Hashing (PCDH), to leverage the pairwise correlation of deep features and semantic supervised information to directly guide discrete hashing codes learning. Firstly, we integrate discrete hash code learning and deep features learning in a unified network framework, which can utilize the semantic supervision to guide discrete hash codes learning. Secondly, we design a novel pairwise correlation constraint to perform pairwise correlation learning of deep features. Thirdly, we develop a novel pairwise construction module to mine good pairwise samples for discrete hash codes learning. Extensive experimental results show that the proposed PCDH approach achieves superior performance over other recent state-of-the-art hashing approaches. (C) 2019 Elsevier B.V. All rights reserved.
Accession Number: WOS:000517884400011
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Chen, Yaxiong  AAR-7285-2020   
Lu, Xiaoqiang    0000-0002-7037-5188 
Chen, Yaxiong    0000-0002-2903-6723 
ISSN: 0925-2312
eISSN: 1872-8286

Record 15 of 333
Title: Flexible Plasmonic Tapes with Nanohole and Nanoparticle Arrays for Refractometric and Strain Sensing
Author(s): Jia, PP (Jia, Peipei); Kong, DP (Kong, Depeng); Ebendorff-Heidepriem, H (Ebendorff-Heidepriem, Heike)
Source: ACS APPLIED NANO MATERIALS  Volume: 3  Issue: 8  Pages: 8242-8246  DOI: 10.1021/acsanm.0c01673  Published: AUG 28 2020  
Abstract: Realization of plasmonic nanostructures on flexible and stretchable substrates have attracted considerable attention because such integration provides novel functionalities for sensing applications. Here, we present a plasmonic tape by achieving metal nanostructures on the transparent tape with a simple transfer technique. Examples include the tapes with nanohole and nanoparticle arrays for refractive index and strain sensing, respectively. These continuing and discrete structures on tapes feature characteristic plasmonic resonances and excellent flexibility. The tape with the nanohole array shows higher sensitivity in the refractive index sensing than that on the rigid substrate. The nanoparticle array used in strain sensing discloses two plasmonic modes with different responses. This plasmonic tape offers a new flexible platform for plasmonic sensing and may open new application possibilities in scenarios inaccessible by conventional plasmonic sensors.
Accession Number: WOS:000566778600099
ISSN: 2574-0970

Record 16 of 333
Title: End-to-end learning interpolation for object tracking in low frame-rate video
Author(s): Liu, LQ (Liu, Liqiang); Cao, JZ (Cao, Jianzhong)
Source: IET IMAGE PROCESSING  Volume: 14  Issue: 6  Pages: 1066-1072  DOI: 10.1049/iet-ipr.2019.0944  Published: MAY 11 2020  
Abstract: In many scenarios, where videos are transmitted through bandwidth-limited channels for subsequent semantic analytics, the choice of frame rates has to balance between bandwidth constraints and analytics performance. Faced with this practical challenge, this study focuses on enhancing object tracking at low frame rates and proposes a learning Interpolation for tracking framework. This framework embeds an implicit video frame interpolation sub-network, which is concatenated and jointly trained with another object tracking sub-network. Once a low frame-rate video is an input, it is first mapped into a high frame-rate latent video, based on which the tracker is learned. Novel strategies and loss functions are derived to ensure the effective end-to-end optimisation of the authors' network. On several challenging benchmarks and settings, their method achieves a highly competitive tradeoff between frame rate and tracking accuracy. As is known, the implications of interpolation on semantic video analytics and tracking remain unexplored, and the authors expect their method to find many applications in mobile embedded vision, Internet of Things and edge computing.
Accession Number: WOS:000530456000008
ISSN: 1751-9659
eISSN: 1751-9667

Record 17 of 333
Title: Retrieval Topic Recurrent Memory Network for Remote Sensing Image Captioning
Author(s): Wang, BQ (Wang, Binqiang); Zheng, XT (Zheng, Xiangtao); Qu, B (Qu, Bo); Lu, XQ (Lu, Xiaoqiang)
Source: IEEE JOURNAL OF SELECTED TOPICS IN APPLIED EARTH OBSERVATIONS AND REMOTE SENSING  Volume: 13  Pages: 256-270  DOI: 10.1109/JSTARS.2019.2959208  Published: 2020  
Abstract: Remote sensing image (RSI) captioning aims to generate sentences to describe the content of RSIs. Generally, five sentences are used to describe the RSI in caption datasets. Every sentence can just focus on part of images' contents due to the different attention parts of annotation persons. One annotated sentence may be ambiguous compared with other four sentences. However, previous methods, treating five sentences separately, may generate an ambiguous sentence. In order to consider five sentences together, a collection of words, which named topic words contained common information among five sentences, is jointly incorporated into a captioning model to generate a determinate sentence that covers common contents in RSIs. Instead of employing a naive recurrent neural network, a memory network in which topic words can be naturally included as memory cells is introduced to generate sentences. A novel retrieval topic recurrent memory network is proposed to utilize the topic words. First, a topic repository is built to record the topic words in training datasets. Then, the retrieval strategy is exploited to obtain the topic words for a test image from topic repository. Finally, the retrieved topic words are incorporated into a recurrent memory network to guide the sentence generation. In addition to getting topics through retrieval, the topic words of test images can also be edited manually. The proposed method sheds light on controllability of caption generation. Experiments are conducted on two caption datasets to evaluate the proposed method.
Accession Number: WOS:000526639900021
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
WANG, binqiang  AAW-6000-2020   
Wang, Binqiang    0000-0001-9406-167X 
Lu, Xiaoqiang    0000-0002-7037-5188 
ISSN: 1939-1404
eISSN: 2151-1535

Record 18 of 333
Title: Highly sensitive label-free biosensor based on graphene-oxide functionalized micro-tapered long period fiber grating
Author(s): Wang, RD (Wang, Ruiduo); Ren, ZY (Ren, Zhaoyu); Kong, DP (Kong, Depeng); Hu, BW (Hu, Baowen); He, ZQ (He, Zhengquan)
Source: OPTICAL MATERIALS  Volume: 109  Article Number: 110253  DOI: 10.1016/j.optmat.2020.110253  Published: NOV 2020  
Abstract: An accurate and highly sensitive label-free biosensing platform for human hemoglobin detection was demonstrated. The biosensor was derived from a micro-tapered long period fiber grating (MTLPG) functionalized by graphene oxide (GO) nanosheets. When the hemoglobin molecules are absorbed onto the fiber surface, the resonance wavelength shift, and thus the hemoglobin concentration can be detected. With hemoglobin concentration from 0.0 mg/mL to 2.0 mg/mL in deionized water, urea solution as well as glucose solution, the GO-MTLPG was implemented as a biosensor and achieved sensitivity of 2 nm/(mg/mL), 1.03 nm/(mg/mL) and 0.73 nm/(mg/mL), respectively. Moreover, the minimum limit of detection is 0.02 mg/mL, which is far below the hemoglobin threshold value of anemia that recommended by World Health Organization. In addition, the reusability of GO-MTLPG for hemoglobin detection in various interfering compounds were validated. The proposed GO-MTLPG can be developed as an optical sensor applied in biomedical and biochemical fields.
Accession Number: WOS:000667930900003
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Wang, Ruiduo    0000-0003-4420-4737 
kong, de peng    0000-0003-3359-5517 
ISSN: 0925-3467
eISSN: 1873-1252

Record 19 of 333
Title: Spectral-Spatial Attention Network for Hyperspectral Image Classification
Author(s): Sun, H (Sun, Hao); Zheng, XT (Zheng, Xiangtao); Lu, XQ (Lu, Xiaoqiang); Wu, SY (Wu, Siyuan)
Source: IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING  Volume: 58  Issue: 5  Pages: 3232-3245  DOI: 10.1109/TGRS.2019.2951160  Published: MAY 2020  
Abstract: Hyperspectral image (HSI) classification aims to assign each hyperspectral pixel with a proper land-cover label. Recently, convolutional neural networks (CNNs) have shown superior performance. To identify the land-cover label, CNN-based methods exploit the adjacent pixels as an input HSI cube, which simultaneously contains spectral signatures and spatial information. However, at the edge of each land-cover area, an HSI cube often contains several pixels whose land-cover labels are different from that of the center pixel. These pixels, named interfering pixels, will weaken the discrimination of spectral-spatial features and reduce classification accuracy. In this article, a spectral-spatial attention network (SSAN) is proposed to capture discriminative spectral-spatial features from attention areas of HSI cubes. First, a simple spectral-spatial network (SSN) is built to extract spectral-spatial features from HSI cubes. The SSN is composed of a spectral module and a spatial module. Each module consists of only a few 3-D convolution and activation operations, which make the proposed method easy to converge with a small number of training samples. Second, an attention module is introduced to suppress the effects of interfering pixels. The attention module is embedded into the SSN to obtain the SSAN. The experiments on several public HSI databases demonstrate that the proposed SSAN outperforms several state-of-the-art methods.
Accession Number: WOS:000529868700019
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Sun, Hao  AAG-5676-2020   
wu, siyuan    0000-0002-9041-8587 
Lu, Xiaoqiang    0000-0002-7037-5188 
Sun, Hao    0000-0002-1314-4957 
ISSN: 0196-2892
eISSN: 1558-0644

Record 20 of 333
Title: Time-resolved characteristics of laser induced breakdown spectroscopy on non-flat samples by single beam splitting
Author(s): Lei, BY (Lei, Bingying); Xu, BP (Xu, Boping); Wang, J (Wang, Jing); Li, J (Li, Jing); Wang, YS (Wang, Yishan); Tang, J (Tang, Jie); Zhao, W (Zhao, Wei); Duan, YX (Duan, Yixiang)
Source: RSC ADVANCES  Volume: 10  Issue: 65  Pages: 39553-39561  DOI: 10.1039/d0ra06582j  Published: NOV 1 2020  
Abstract: A single-beam-splitting approach was used to enhance the signal intensity of LIBS under the extreme conditions of laser beam grazing of the surface of non-flat samples. Time-resolved spectra show that the laser-ablated plasma presents a stronger spectral intensity and a slower plasma decay in the split beam mode because of the higher laser irradiance. The temporal evolutions of signal enhancement factors indicate that the enhancement effect first rises and then drops with delay time and the maximum enhancement factor of Al plasma comes later than that of Cu plasma under the same laser energy. The mechanisms behind it are discussed. It is also found that the electron density exhibits a faster decay with delay time in the split beam mode, mainly due to the faster plasma expansion. And a slower increase of electron density with laser energy is observed in the split beam mode because of the plasma shielding effect.
Accession Number: WOS:000584324000020
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Lei, Bingying    0000-0002-3843-3907 
eISSN: 2046-2069

Record 21 of 333
Title: Spatial attention based visual semantic learning for action recognition in still images
Author(s): Zheng, YP (Zheng, Yunpeng); Zheng, XT (Zheng, Xiangtao); Lu, XQ (Lu, Xiaoqiang); Wu, SY (Wu, Siyuan)
Source: NEUROCOMPUTING  Volume: 413  Pages: 383-396  DOI: 10.1016/j.neucom.2020.07.016  Published: NOV 6 2020  
Abstract: Visual semantic parts play crucial roles in still image-based action recognition. A majority of existing methods require additional manual annotations such as human bounding boxes and predefined body parts besides action labels to learn action related visual semantic parts. However, labeling these manual annotations is rather time-consuming and labor-intensive. Moreover, not all manual annotations are effective when recognizing a specific action. Some of them can be irrelevant and even misguided. To address these limitations, this paper proposes a multi-stage deep learning method called Spatial Attention based Action Mask Networks (SAAM-Nets). The proposed method does not need any additional annotations besides action labels to obtain action-specific visual semantic parts. Instead, we propose a spatial attention layer injected in a convolutional neural network to create a specific action mask for each image with only action labels. Moreover, based on the action mask, we propose a region selection strategy to generate a semantic bounding box containing action-specific semantic parts. Furthermore, to effectively combine the information of the whole scene and the sematic box, two feature attention layers are adopted to obtain more discriminative representations. Experiments on four benchmark datasets have demonstrated that the proposed method can achieve promising performance compared with state-of-the-art methods. (C) 2020 Elsevier B.V. All rights reserved.
Accession Number: WOS:000579803700032
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
wu, siyuan    0000-0002-9041-8587 
ISSN: 0925-2312
eISSN: 1872-8286

Record 22 of 333
Title: Generalized Polarimetric Dehazing Method Based on Low-Pass Filtering in Frequency Domain
Author(s): Liang, J (Liang, Jian); Ju, HJ (Ju, Haijuan); Ren, LY (Ren, Liyong); Yang, LM (Yang, Liming); Liang, RG (Liang, Rongguang)
Source: SENSORS  Volume: 20  Issue: 6  Article Number: 1729  DOI: 10.3390/s20061729  Published: MAR 2020  
Abstract: Polarimetric dehazing methods can significantly enhance the quality of hazy images. However, current methods are not robust enough under different imaging conditions. In this paper, we propose a generalized polarimetric dehazing method based on low-pass filtering in the frequency domain. This method can accurately estimate the polarized state of the scattering light automatically without adjusting bias parameters. Experimental results show the effectiveness and robustness of our proposed method in different hazy weather and scattering underwater environments with different densities. Furthermore, computational efficiency is enhanced more than 70% compared to the polarimetric dehazing method we proposed previously.
Accession Number: WOS:000529139700187
PubMed ID: 32244850
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Ren, Liyong  F-5518-2014  0000-0002-7547-7511 
, Jian    0000-0002-0324-1497 
eISSN: 1424-8220

Record 23 of 333
Title: Method to control near-field bowing of laser diode arrays by balancing the thermal-induced stress
Author(s): Zhang, HY (Zhang, Hongyou); Zah, CE (Zah, Chung-en); Liu, XS (Liu, Xingsheng)
Source: OPTICAL ENGINEERING  Volume: 59  Issue: 3  Article Number: 036104  DOI: 10.1117/1.OE.59.3.036104  Published: MAR 2020  
Abstract: Due to the thermal-induced stress during the bonding process, the emitters in a laser diode array (LDA) are vertically displaced, which causes the near-field bowing of a laser diode bar (i.e., the SMILE effect). Near-field bowing degrades the laser beam brightness, adversely affecting optical coupling and beam shaping, resulting in a larger divergence angle and a wider line after focusing and collimation. The mechanism of near-field bowing has been theoretically studied, in which the ratio of tensile strength between submount and heat sink has a great effect on the deformation of LDAs. Arm-wrestling between CuW submount and heat sink vividly describes that the deformation of LDAs changes as a function of the ratio of two materials' tensile strength. We design a symmetrical structure that bonds another submount on the bottom of the heat sink to control the SMILE effect by balancing the acting force from the top of the heat sink. The deformation of the heat sink and LDAs are approximately zero when the thermal-induced stresses forced on the top and bottom of the heat sink are equal. (C) 2020 Society of Photo-Optical Instrumentation Engineers (SPIE)
Accession Number: WOS:000523350500035
ISSN: 0091-3286
eISSN: 1560-2303

Record 24 of 333
Title: Development of low-loss lead-germanate glass for mid-infrared fiber optics: II. preform extrusion and fiber fabrication
Author(s): Wang, PF (Wang, Pengfei); Ng, AKL (Ng, Alson Kwun Leung); Dowler, A (Dowler, Alastair); Ebendorff-Heidepriem, H (Ebendorff-Heidepriem, Heike)
Source: JOURNAL OF THE AMERICAN CERAMIC SOCIETY  Volume: 104  Issue: 2  Pages: 833-850  DOI: 10.1111/jace.17518  Early Access Date: NOV 2020   Published: FEB 2021  
Abstract: For lead-germanate glass fibers, reducing the content of hydroxyl (OH) groups and the formation of metallic Pb species is essential to pave the way for their applications as low-loss mid-IR fiber optics since OH and metallic Pb species cause intense absorption and scattering loss, respectively, in the mid-IR spectral range. The first part of this study reported the optimization of the glass melting procedure to obtain low amount of OH while preventing formation of metallic Pb species in lead-germanate glass. Here, the second part of this study reports the investigation of the process conditions to fabricate low-loss lead-germanate glass fiber through further understanding of the co-effects of glass melting and heat treatment atmospheres on the formation of nano- and micron-scale metallic Pb species in both the as-produced and heat treated lead-germanate glasses. Finally, using this advance in knowledge, we successfully fabricated low-loss lead-germanate glass fibers with no presence of reduced metallic Pb particles by optimizing dehydration agent, glass melting, preform extrusion and fiber drawing conditions. The optimized fabrication conditions reduced the unstructured fiber loss by almost one order to <0.3 dB/m at 1.55 mu m.
Accession Number: WOS:000583052200001
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Wang, Pengfei  D-7632-2012  0000-0002-5285-9832 
Ng, Alson    0000-0001-6644-629X 
ISSN: 0002-7820
eISSN: 1551-2916

Record 25 of 333
Title: Novel Band-Edge Work Function Performance Modulation via NPT with PMOS1st/NMOS1st Laminated Stack for PMOS Low Power Target
Author(s): Yao, JX (Yao, Jiaxin); Yin, HX (Yin, Huaxiang); Wu, ZH (Wu, Zhenhua); Tian, JS (Tian, Jinshou)
Source: ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY  Volume: 9  Issue: 10  Article Number: 103004  DOI: 10.1149/2162-8777/abc45f  Published: NOV 1 2020  
Abstract: In this paper, the band-edge work function performance is systematically investigated and modulated via novel nitrogen plasma treatment (NPT) with the advanced PMOS1st (TiN/TiN/TiAlC) and NMOS1st (TiN/TiN) laminated stacks for the fabricated PMOS capacitors. The basic multi-V-T performance is strongly modulated by controlling NPT process. 1) Flatband voltage (V-FB) shifts towards band edge are obtained as +120 mV (undiluted), +430 mV (diluted) for PMOS1st and +80 mV (undiluted), +210 mV (diluted) for NMOS1st. 2) By manipulating the NPT process from undiluted and diluted case, it can provide significant high band-edge effective work function ranging from 4.89 eV (undiluted) to 5.21 eV (diluted) for PMOS1st and 5.22 eV (undiluted) to 5.35 eV (diluted) for NMOS1st laminated stack, respectively. 3) NPT diluted with hydrogen is observed to maintain ultralow bulk trap density (1.11 x 10(11) cm(-2) for PMOS1st and nearly zero for NMOS1st) and interface trap density (3.34 x 10(11) eV(-1) cm(-2) for PMOS1st and 6.45 x 10(11) eV(-1) cm(-2) for NMOS1st). The significant band-edge work function modulation and very low bulk and interface trap density demonstrate the novel NPT with PMOS1st/NMOS1st laminated stack is very promising to achieve the target of PMOS low-power application in the further technology node.
Accession Number: WOS:000588313700001
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Yao, Jiaxin    0000-0002-7668-4811 
ISSN: 2162-8769
eISSN: 2162-8777

Record 1 of 333
Title: Property-Constrained Dual Learning for Video Summarization
Author(s): Zhao, B (Zhao, Bin); Li, XL (Li, Xuelong); Lu, XQ (Lu, Xiaoqiang)
Source: IEEE TRANSACTIONS ON NEURAL NETWORKS AND LEARNING SYSTEMS  Volume: 31  Issue: 10  Pages: 3989-4000  DOI: 10.1109/TNNLS.2019.2951680  Published: OCT 2020  
Abstract: Video summarization is the technique to condense large-scale videos into summaries composed of key-frames or key-shots so that the viewers can browse the video content efficiently. Recently, supervised approaches have achieved great success by taking advantages of recurrent neural networks (RNNs). Most of them focus on generating summaries by maximizing the overlap between the generated summary and the ground truth. However, they neglect the most critical principle, i.e., whether the viewer can infer the original video content from the summary. As a result, existing approaches cannot preserve the summary quality well and usually demand large amounts of training data to reduce overfitting. In our view, video summarization has two tasks, i.e., generating summaries from videos and inferring the original content from summaries. Motivated by this, we propose a dual learning framework by integrating the summary generation (primal task) and video reconstruction (dual task) together, which targets to reward the summary generator under the assistance of the video reconstructor. Moreover, to provide more guidance to the summary generator, two property models are developed to measure the representativeness and diversity of the generated summary. Practically, experiments on four popular data sets (SumMe, TVsum, OVP, and YouTube) have demonstrated that our approach, with compact RNNs as the summary generator, using less training data, and even in the unsupervised setting, can get comparable performance with those supervised ones adopting more complex summary generators and trained on more annotated data.
Accession Number: WOS:000576436600017
PubMed ID: 31825876
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Li, Xuelong  ABF-3381-2020   
Lu, Xiaoqiang    0000-0002-7037-5188 
ISSN: 2162-237X
eISSN: 2162-2388

Record 2 of 333
Title: Self-trapped spatially localized states in combined linear-nonlinear periodic potentials
Author(s): Shi, JC (Shi, Jin-Cheng); Zeng, JH (Zeng, Jian-Hua)
Source: FRONTIERS OF PHYSICS  Volume: 15  Issue: 1  DOI: 10.1007/s11467-019-0930-3  Published: FEB 2020  
Abstract: We analyze the existence and stability of two kinds of self-trapped spatially localized gap modes, gap solitons and truncated nonlinear Bloch waves, in one- and two-dimensional optical or matter-wave media with self-focusing nonlinearity, supported by a combination of linear and nonlinear periodic lattice potentials. The former is found to be stable once placed inside a single well of the nonlinear lattice, it is unstable otherwise. Contrary to the case with constant self-focusing nonlinearity, where the latter solution is always unstable, here, we demonstrate that it nevertheless can be stabilized by the nonlinear lattice since the model under consideration combines the unique properties of both the linear and nonlinear lattices. The practical possibilities for experimental realization of the predicted solutions are also discussed.
Accession Number: WOS:000497667500002
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Zeng, Jianhua  AAL-5533-2021  0000-0003-0189-1856 
ISSN: 2095-0462
eISSN: 2095-0470

Record 3 of 333
Title: Cobalt and iron co-doped ZnSe nanocrystals:Mid-IR luminescence at room temperature
Author(s): Shi, HW (Shi, Huawei); Cui, XX (Cui, Xiaoxia); Xiao, XS (Xiao, Xusheng); Xu, Y (Xu, Yantao); Liu, C (Liu, Chao); Hou, CQ (Hou, Chaoqi); Guo, HT (Guo, Haitao)
Source: JOURNAL OF LUMINESCENCE  Volume: 221  Article Number: 117102  DOI: 10.1016/j.jlumin.2020.117102  Published: MAY 2020  
Abstract: Fe:Co:ZnSe nanocrystals with different co-doping ratios of Fe2+/Co2+ ions were fabricated by hydrothermal synthesis. The facile method used in the present work avoids the mid-infrared quench effect induced by the organic molecular introduced in the past preparation process. These nanocrystals are spherical in shape and exhibit a cubic sphalerite structure with an average grain size of about 15 nm. Through the energy conversion between Co2+ and Fe2+ ions, mid-infrared fluorescences at 3.3 mu m and 4.4 mu m were detected under 1550 nm laser excitation at room temperature. The fluorescence band of 4.4 mu m in the Fe:Co:ZnSe nanocrystals is thought to be an overlapping emission involving the peak centered at 4648 nm corresponding to the Co2+:T-4(1) (F) -> T-4(2) (F) energy transition and the peak centered at 4273 nm corresponding to Fe2+:T-5(2) (D) -> E-5 (D) energy transition. These high-quality optically active nanomaterials show potential applications in mid-infrared devices such as composite fiber-amplifiers and lasers materials.
Accession Number: WOS:000518457400039
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Liu, Chao  B-4938-2008  0000-0003-4324-6409 
ISSN: 0022-2313
eISSN: 1872-7883

Record 4 of 333
Title: Deep balanced discrete hashing for image retrieval
Author(s): Zheng, XT (Zheng, Xiangtao); Zhang, YC (Zhang, Yichao); Lu, XQ (Lu, Xiaoqiang)
Source: NEUROCOMPUTING  Volume: 403  Pages: 224-236  DOI: 10.1016/j.neucom.2020.04.037  Published: AUG 25 2020  
Accession Number: WOS:000541447500006
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Lu, Xiaoqiang    0000-0002-7037-5188 
ISSN: 0925-2312
eISSN: 1872-8286

Record 5 of 333
Title: Sound Active Attention Framework for Remote Sensing Image Captioning
Author(s): Lu, XQ (Lu, Xiaoqiang); Wang, BQ (Wang, Binqiang); Zheng, XT (Zheng, Xiangtao)
Source: IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING  Volume: 58  Issue: 3  Pages: 1985-2000  DOI: 10.1109/TGRS.2019.2951636  Published: MAR 2020  
Abstract: Attention mechanism-based image captioning methods have achieved good results in the remote sensing field, but are driven by tagged sentences, which is called passive attention. However, different observers may give different levels of attention to the same image. The attention of observers during testing, then, may not be consistent with the attention during training. As a direct and natural human-machine interaction, speech is much faster than typing sentences. Sound can represent the attention of different observers. This is called active attention. Active attention can be more targeted to describe the image; for example, in disaster assessments, the situation can be obtained quickly and the corresponding disaster areas can be located related to the specific disaster. A novel sound active attention framework is proposed for more specific caption generation according to the interest of the observer. First, sound is modeled by mel-frequency cepstral coefficients (MFCCs) and the image is encoded by convolutional neural networks (CNNs). Then, to handle the continuity characteristic of sound, a sound module and an attention module are designed based on the gated recurrent units (GRUs). Finally, the sound-guided image feature processed by the attention module is imported into the output module to generate descriptive sentence. Experiments based on both fake and real sound data sets show that the proposed method can generate sentences that can capture the focus of human.
Accession Number: WOS:000519598700037
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
WANG, binqiang  AAW-6000-2020   
Wang, Binqiang    0000-0001-9406-167X 
Lu, Xiaoqiang    0000-0002-7037-5188 
ISSN: 0196-2892
eISSN: 1558-0644

Record 6 of 333
Title: Logical Image Reconstruction by Monitoring a Seeded Potential in Variable Detection Planes
Author(s): Zhang, YB (Zhang, Yongbin); Huang, N (Huang, Nan); Wang, ZL (Wang, Zhaolu); Liu, HJ (Liu, Hongjun)
Source: IEEE ACCESS  Volume: 8  Pages: 210970-210977  DOI: 10.1109/ACCESS.2020.3039121  Published: 2020  
Abstract: Optical image computing, such as spatial differentiation, logical transform, and addition-subtraction operation, is of great importance to signal enhancement, transform, and extraction, but such nonlinear methods are restrained in incoherent or scattering imaging. Here, the logical white-light image reconstruction, as an optical image computing method for incoherent and scattered images, is proposed by monitoring a seeded potential in variable detection planes. The weak white-light signals collectively seed a potential at the expense of scattering noise based on seeded modulation instability in a photorefractive crystal. Then the logical image operation is achieved by sensitively probing the seeded potential and recording the intensity distribution of the probe beam in different detection planes. The proposed method has a strong ability of ballistic signal recording, reproduction, and reversal. The numerical and experimental results show a new physical phenomena in which the indirect interaction between light waves through a seeded potential is presented in different forms. The nonlinear method is proved to effectively operate pure images, the images scattered by a rotating diffuser, and the images scattered by fogs whether under back lighting or under front lighting. Our work suggests an alternative method for all-optical image processing, recovery, and computing.
Accession Number: WOS:000596370600001
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Zhang, Yongbin    0000-0002-3083-1054 
ISSN: 2169-3536

Record 7 of 333
Title: Application of rare earth-doped nanoparticles in biological imaging and tumor treatment
Author(s): Fan, Q (Fan, Qi); Cui, XX (Cui, Xiaoxia); Guo, HT (Guo, Haitao); Xu, YT (Xu, Yantao); Zhang, GW (Zhang, Guangwei); Peng, B (Peng, Bo)
Source: JOURNAL OF BIOMATERIALS APPLICATIONS  Volume: 35  Issue: 2  Pages: 237-263  Article Number: 0885328220924540  DOI: 10.1177/0885328220924540  Early Access Date: MAY 2020   Published: AUG 2020  
Abstract: Rare earth-doped nanoparticles have been widely used in disease diagnosis, drug delivery, tumor therapy, and bioimaging. Among various bioimaging methods, the fluorescence imaging technology based on the rare earth-doped nanoparticles can visually display the cell activity and lesion evolution in living animals, which is a powerful tool in biological technology and has being widely applied in medical and biological fields. Especially in the band of near infrared (700-1700 nm), the emissions show the characteristics of deep penetration due to low absorption, low photon scattering, and low autofluorescence interference. Furthermore, the rare earth-doped nanoparticles can be endowed with the water solubility, biocompatibility, drug-loading ability, and the targeting ability for different tumors by surface functionalization. This confirms its potential in the cancer diagnosis and treatment. In this review, we summarized the recent progress in the application of rare earth-doped nanoparticles in the field of bioimaging and tumor treatment. The luminescent mechanism, properties, and structure design were also discussed.
Accession Number: WOS:000534319400001
PubMed ID: 32423319
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Cui, Xiaoxia    0000-0001-5629-6312 
ISSN: 0885-3282
eISSN: 1530-8022

Record 8 of 333
Title: Long modal interference in multimode fiber and its application in vital signs monitoring
Author(s): Xu, W (Xu, Wei); Shen, Y (Shen, Ying); Yu, CY (Yu, Changyuan); Dong, B (Dong, Bo); Zhao, W (Zhao, Wei); Wang, YS (Wang, Yishan)
Source: OPTICS COMMUNICATIONS  Volume: 474  Article Number: 126100  DOI: 10.1016/j.optcom.2020.126100  Published: NOV 1 2020  
Abstract: All-fiber vital signs monitoring based on long-modal-interference (LMI) in multimode fiber (MMF) is proposed and investigated theoretically and experimentally. The LMI-MMF is simply formed by splicing of a two-meter-long MMF and two single mode fibers (SMFs) with core-offsets at splicing joints. It is worth mentioning that all fibers that used are sheathed with 900-m protection sleeve. Core-offset dependency of vital signs monitoring performance is specifically analyzed. Experiments are carried out on subjects with weight from 56 kg to 103 kg without further optimization or modification. Compared with commercial piezoceramic-based respiratory sensor and SpO(2)-based heartbeat sensor, the proposed non-wearable all-fiber vital signs monitoring sensor based on LMI-MMF shows great consistence with high Person's correlation coefficient. It is the first time to put forward the LMI-MMF-based fiber sensor and apply it to realize the non-wearable vital signs monitoring. Specific superiorities of low cost, real time and non-intrusiveness make it potentially competitive in household healthcare and other medical fields.
Accession Number: WOS:000579424200049
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Yu, Changyuan  C-2241-2011  0000-0002-3185-0441 
ISSN: 0030-4018
eISSN: 1873-0310

Record 9 of 333
Title: Blur Kernel Estimation by Structure Sparse Prior
Author(s): Yuan, XB (Yuan, Xiaobin); Zhu, JP (Zhu, Jingping); Li, XB (Li, Xiaobin)
Source: APPLIED SCIENCES-BASEL  Volume: 10  Issue: 2  Article Number: 657  DOI: 10.3390/app10020657  Published: JAN 2020  
Abstract: Blind image deblurring tries to recover a sharp version from a blurred image, where blur kernel is usually unknown. Recently, sparse representation has been successfully applied to estimate the blur kernel. However, the sparse representation has not considered the structure relationships among original pixels. In this paper, a blur kernel estimation method is proposed by introducing the locality constraint into sparse representation framework. Both the sparsity regularization and the locality constraint are incorporated to exploit the structure relationships among pixels. The proposed method was evaluated on a real-world benchmark dataset. Experimental results demonstrate that the proposed method achieve comparable performance to the state-of-the-art methods.
Accession Number: WOS:000522540400233
eISSN: 2076-3417

Record 10 of 333
Title: Using hyperspectral imaging automatic classification of gastric cancer grading with a shallow residual network
Author(s): Liu, S (Liu, Song); Wang, Q (Wang, Quan); Zhang, G (Zhang, Geng); Du, J (Du, Jian); Hu, BL (Hu, Bingliang); Zhang, ZF (Zhang, Zhoufeng)
Source: ANALYTICAL METHODS  Volume: 12  Issue: 30  Pages: 3844-3853  DOI: 10.1039/d0ay01023e  Published: AUG 14 2020  
Abstract: The gastric cancer grading of patients determines their clinical treatment plan. We use hyperspectral imaging (HSI) gastric cancer section data to automatically classify the three different cancer grades (low grade, intermediate grade, and high grade) and healthy tissue. This paper proposed the use of HSI data combined with a shallow residual network (SR-Net) as the classifier. We collected hyperspectral data from gastric sections of 30 participants, with the wavelength range of hyperspectral data being 374 nm to 990 nm. We compared the classification results between hyperspectral data and color images. The results show that using hyperspectral data and a SR-Net an average classification accuracy of 91.44% could be achieved, which is 13.87% higher than that of the color image. In addition, we applied a modified SR-Net incorporated direct down-sampling, asymmetric filters, and global average pooling to reduce the parameters and floating-point operations. Compared with the regular residual network with the same number of blocks, the floating-point operations of a SR-Net are one order of magnitude less. The experimental results show that hyperspectral data with a SR-Net can achieve cutting-edge performance with minimum computational cost and therefore have potential in the study of gastric cancer grading.
Accession Number: WOS:000556082200008
PubMed ID: 32685943
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Liu, Song    0000-0002-1061-5274 
ISSN: 1759-9660
eISSN: 1759-9679

Record 11 of 333
Title: Non-linear calibration optimisation based on the Levenberg-Marquardt algorithm
Author(s): Hu, GL (Hu, Guoliang); Zhou, ZF (Zhou, Zuofeng); Cao, JZ (Cao, Jianzhong); Huang, HM (Huang, Huimin)
Source: IET IMAGE PROCESSING  Volume: 14  Issue: 7  Pages: 1402-1414  DOI: 10.1049/iet-ipr.2019.1489  Published: MAY 29 2020  
Abstract: An outstanding calibration algorithm is the most important factor that affects the precision of attitude measurement. This study proposes a non-linear optimisation algorithm to refine the solutions of the initial guess obtained using the Zhang's technique, the Bouget's technique, or the Hartley's algorithm. Large sets of point correspondences were adopted to test the validity of the proposed method. Extensive practical experiments demonstrated that the proposed method can significantly improve the accuracy of calibration and ultimately obtains higher measurement precision. The error of the reprojection in the proposed method was <0.13 px. At a range of 1 m, the error rate was 0.5% for the length test and about 3% for the angle test. This study proposes a new method to calibrate the relationship between laser radar and the camera. Binocular vision was used to reconstruct the point cloud of the non-cooperative target. At the same time, data was also obtained using laser radar. Finally, the two groups of systems were fused. Accurate and dense three-dimensional information of the target was obtained. It could not only obtain the dense pose information of the target surface but also the texture and colour feature information of the target surface.
Accession Number: WOS:000536604200022
ISSN: 1751-9659
eISSN: 1751-9667

Record 12 of 333
Title: Fast structured illumination three-dimensional color microscopic imaging method based on Hilbert-transform
Author(s): Qian, J (Qian Jia); Dang, SP (Dang Shi-Pei); Zhou, X (Zhou Xing); Dan, D (Dan Dan); Wang, ZJ (Wang Zhao-Jun); Zhao, TY (Zhao Tian-Yu); Liang, YS (Liang Yan-Sheng); Yao, BL (Yao Bao-Li); Lei, M (Lei Ming)
Source: ACTA PHYSICA SINICA  Volume: 69  Issue: 12  Article Number: 128701  DOI: 10.7498/aps.69.20200352  Published: JUN 20 2020  
Abstract: As a wide-field microscopy, structured illumination microscopy (SIM) enables super-resolution and three-dimensional (3D) imaging. It has recently received lots of attention due to the advantages of high spatial resolution, short image recording time, and less photobleaching and phototoxicity. The SIM has found numerous important applications in time-lapse imaging of living tissues and cellular structures in the field of biomedical science. Color information is an important physical quantity describing the characteristics of living creatures and reflects the differences in its microstructure and optical property to some extent. Although HSV (hue, saturation, value) color space based structured illumination full-color 3D optical sectioning technique can recover the full color information on the surface of the samples without color distortion. However, for each optical sectioning, three raw images with fixed phase shift are required to calculate the sectioning images by the root mean square (RMS) algorithm. This will dramatically increase the data acquisition time and data storage space, especially for a large-scaled sample that needs image stitching strategy. The image processing progress operated in HSV color space need to run the RMS algorithm three times in each channel of HSV space for every section, and transform the images between RGB (red-green-blue) space and HSV space twice. This will absolutely extend the data processing time and put forward higher requirements for computer hardware and software for data storage and processing. To this end, in this paper, a fast 3D color optical sectioning SIM algorithm based on Hilbert-transform is proposed. The Hilbert-transform has proved to be a powerful tool in digital signal and image processing and has successfully applied to the SIM. Here, only two raw images with structured illumination are needed to reconstruct a full-color optical sectioned image for each slice. This fast 3D color sectioning method has the advantage of insensitivity to phase-shift error and has better adaptability to noise, high quality color sectioning images can be obtained under the phase-shift error or noise disturbed environment. The image acquisition data are reduced by 1/ 3 and the color optical sectioning reconstruction time is saved by about 28%, this new method effectively improves the efficiency and speed for 3D color imaging and will bring a wider application range for SIM.
Accession Number: WOS:000560743400032
ISSN: 1000-3290

Record 13 of 333
Title: Using Cherenkov imaging to monitor the match line between photon and electron radiation therapy fields on biological tissue phantoms
Author(s): Li, Y (Li, Yi); Liu, HJ (Liu, Hongjun); Huang, N (Huang, Nan); Wang, ZL (Wang, Zhaolu); Zhang, CM (Zhang, Chunmin)
Source: JOURNAL OF BIOMEDICAL OPTICS  Volume: 25  Issue: 12  Article Number: 125001  DOI: 10.1117/1.JBO.25.12.125001  Published: DEC 2020  
Abstract: Significance: Due to patients' respiratory movement or involuntary body movements during breast cancer radiotherapy, the mismatched adjacent fields in surface exposure regions could result in insufficient dosage or overdose in these regions, which would lead to tissue injury, excessive skin burns, and potential death. Cherenkov luminescence imaging (CLI) could be used to effectively detect the matching information of adjacent radiation fields without extra radiation or invasive imaging.
Aim: Our objective was to provide a biological experimental basis for monitoring matching of adjacent radiation fields between photon and electron fields due to introduced shifts during radiotherapy by CLI technique.
Approach: A medical accelerator was used to generate photon and electron fields. An industrial camera system was adopted to image the excited CLI signal during irradiation of chicken tissue with yellow (group A and group C experiments) or black color (group B experiment). The following introduced shifts were tested: 10, 5, 2, and 0 mm toward superior or inferior direction. A model was introduced to deal with matching error analysis of adjacent radiation fields due to introduced shifts with adapted plans used to treat neoplasms of the right breast with supraclavicular nodes or internal mammary lymph node.
Results: The matching values between photon and electron fields were consistent with the tested introduced shifts during yellow chicken irradiation. In group A, average discrepancies were 0.59 +/- 0.35 mm and 0.68 +/- 0.37 mm for photon fields and electron fields in anterior/posterior (AP) direction, with 87% and 75% of measurement within 1 mm, respectively. In group C, average discrepancies were 0.80 +/- 0.65 mm and 1.07 +/- 0.57 mm for oblique photon field with gantry angles of 330 deg and 150 deg, with 66% and 65% of measurement within 1 mm, respectively. The average discrepancies were 0.44 +/- 0.30 mm for electron field in the AP direction, with 94% of measurement within 1 mm. The matching error introduced by the proposed method was less than 1.5 mm for AP fields and 2 mm for oblique incidence fields. However, the field matching could not be monitored with black chicken tissue irradiation due to a weak CLI signal that could hardly be extracted from background noise in group B.
Conclusions: CLI is demonstrated for the quantitative monitoring of the field match line on light biological tissue phantoms and has potential for monitoring of field matching in surface tissue during breast cancer radiotherapy. (C) The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License.
Accession Number: WOS:000605144900009
PubMed ID: 33300317
ISSN: 1083-3668
eISSN: 1560-2281

Record 14 of 333
Title: Toroidal dipole bound states in the continuum metasurfaces for terahertz nanofilm sensing
Author(s): Chen, X (Chen, Xu); Fan, WH (Fan, Wenhui); Yan, H (Yan, Hui)
Source: OPTICS EXPRESS  Volume: 28  Issue: 11  Pages: 17102-17112  DOI: 10.1364/OE.394416  Published: MAY 25 2020  
Abstract: A novel terahertz nanofilm sensor consisting of toroidal dipole bound states in the continuum (TD-BIC) inspired Fano resonance metasurface is proposed and investigated, which exhibits both the ID character and BIC feature. When the mirror symmetry of the unit cell was broken, the TD resonance was excited and demonstrated by anti-aligned magnetic dipoles and calculated scattering powers and the BIC mode was verified with the quality factor satisfying the inverse square law. Combined with the amplitude difference referencing technique, the TD-BIC inspired Fano resonance was utilized for nanofilm sensing at THz frequencies for the first time. Simulation results show that the amplitude difference can be easily observed by comparing the resonance frequency shift under difference thicknesses of germanium overlayer. Moreover, by coating with a 40 nm-thick analyte overlayer, the sensitivity of amplitude difkrence can achieve 0.32/RIU, which is a significant value and more suitable for sensing nanofilm analytes than the traditional frequency shift method. These advantages make our proposed structure have potential applications in sensing nanofilm analytes. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Accession Number: WOS:000542303000108
PubMed ID: 32549519
ISSN: 1094-4087

Record 15 of 333
Title: Preventing critical collapse of higher-order solitons by tailoring unconventional optical diffraction and nonlinearities
Author(s): Zeng, LW (Zeng, Liangwei); Zeng, JH (Zeng, Jianhua)
Source: COMMUNICATIONS PHYSICS  Volume: 3  Issue: 1  Article Number: 26  DOI: 10.1038/s42005-020-0291-9  Published: JAN 28 2020  
Abstract: Stabilising localised solitons in higher dimensions is more challenging than their one dimensional counterpart due to the onset of critical collapse. Here, competing nonlinear terms are added to a linearly-modulated optical lattice to predict regimes of stability for different soliton families.
Self-trapped modes suffer critical collapse in two-dimensional cubic systems. To overcome such a collapse, linear periodic potentials or competing nonlinearities between self-focusing cubic and self-defocusing quintic nonlinear terms are often introduced. Here, we combine both schemes in the context of an unconventional and nonlinear fractional Schrodinger equation with attractive-repulsive cubic-quintic nonlinearity and an optical lattice. We report theoretical results for various two-dimensional trapped solitons, including fundamental gap and vortical solitons as well as the gap-type soliton clusters. The latter soliton family resembles the recently-found gap waves. We uncover that, unlike the conventional case, the fractional model exhibiting fractional diffraction order strongly influences the formation of higher band gaps. Hence, a new route for the study of self-trapped modes in these newly emergent higher band gaps is suggested. Regimes of stability and instability of all the soliton families are obtained with the help of linear-stability analysis and direct simulations.
Accession Number: WOS:000511462000001
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Zeng, Jianhua  AAL-5533-2021  0000-0003-0189-1856 
Zeng, Liangwei    0000-0001-9603-1845 
ISSN: 2399-3650

Record 16 of 333
Title: Generation of non-Kolmogorov atmospheric turbulence phase screen using intrinsic embedding fractional Brownian motion method
Author(s): Wang, KD (Wang, Kaidi); Su, XQ (Su, Xiuqin); Li, Z (Li, Zhe); Wu, SB (Wu, Shaobo); Zhou, W (Zhou, Wei); Wang, R (Wang, Rui); Chen, SM (Chen, Songmao); Wang, X (Wang, Xuan)
Source: OPTIK  Volume: 207  Article Number: 164444  DOI: 10.1016/j.ijleo.2020.164444  Published: APR 2020  
Abstract: Generating phase screens to replace phase fluctuation caused by atmospheric turbulence is essential for simulation of light propagation through the atmosphere. Error between power spectral density of actual turbulence and traditional Kolmogorov model illustrates the importance of generating non-Kolmogorov phase screen. Meanwhile, methods used to generate phase screen at present show different kinds of disadvantages respectively. In this paper, we adopt a new method named "intrinsic embedding fractional Brownian motion (IE-FBM)". First, relationship between phase screen and FBM is analyzed. Next, principle of IE-FBM is clarified. We expand the correlation matrix and generate a stationary Gaussian surface through two fast Fourier transforms, which is the principle of intrinsic embedding. After that, we adjust the Gaussian surface into an FBM surface. Finally, simulation results demonstrate that IE-FBM combines advantages of traditional methods. Phase structure function becomes closer to theoretical value no matter how we set parameters of phase screen. Besides, both low and high frequency components of phase screen are sufficient and creases don't exist. In addition, time consumption reduces apparently. In conclusion, our method is comprehensively optimal choice to generate phase screen.
Accession Number: WOS:000523186200063
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Zhou, Weu  ABA-9056-2020   
Su, Xiuqin    0000-0002-6554-2762 
Wang, Kaidi    0000-0001-8145-5530 
ISSN: 0030-4026
eISSN: 1618-1336

Record 17 of 333
Title: Subspace Clustering Constrained Sparse NMF for Hyperspectral Unmixing
Author(s): Lu, XQ (Lu, Xiaoqiang); Dong, L (Dong, Le); Yuan, Y (Yuan, Yuan)
Source: IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING  Volume: 58  Issue: 5  Pages: 3007-3019  DOI: 10.1109/TGRS.2019.2946751  Published: MAY 2020  
Abstract: As one of the most important information of hyperspectral images (HSI), spatial information is usually simulated with the similarity among pixels to enhance the unmixing performance of nonnegative matrix factorization (NMF). Nevertheless, the similarity is generally calculated based on the Euclidean distance between pairwise pixels, which is sensitive to noise and fails in capturing subspace information of hyperspectral data. In addition, it is independent of the NMF framework. In this article, we propose a novel unmixing method called subspace clustering constrained sparse NMF (SC-NMF) for hyperspectral unmixing to more accurately extract endmembers and correspond abundances. First, the nonnegative subspace clustering is embedded into the NMF framework to learn a similar graph, which takes full advantage of the characteristics of the reconstructed data itself to extract the spatial correlation of pixels for unmixing. It is noteworthy that the similar graph and NMF will be simultaneously updated. Second, to mitigate the influence of noise in HSI, only the $k$ largest values are retained in each self-expression vector. Finally, we use the idea of subspace clustering to extract endmembers by linearly combining of all pixels in spectral subspace, aiming at giving a reasonable physical significance to the endmembers. We evaluate the proposed SC-NMF on both synthetic and real hyperspectral data, and experimental results demonstrate that the proposed method is effective and superior by comparing with the state-of-the-art methods.
Accession Number: WOS:000529868700002
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Yuan, Yuan  ABB-2379-2020   
Lu, Xiaoqiang    0000-0002-7037-5188 
ISSN: 0196-2892
eISSN: 1558-0644

Record 18 of 333
Title: Numerical analysis of light reflection and transmission in poly-disperse sea fog
Author(s): Zhang, C (Zhang, Chi); Zhang, JQ (Zhang, Jianqi); Wu, X (Wu, Xin); Huang, ML (Huang, Melin)
Source: OPTICS EXPRESS  Volume: 28  Issue: 17  Pages: 25410-25430  DOI: 10.1364/OE.400002  Published: AUG 17 2020  
Abstract: The presence of sea fog greatly affects both the reflected and transmitted detections when radiation propagates through targets and maritime backgrounds. Thus, the maritime target detections and the remote sensing in oceanic environments would be disturbed by the sea fog. In our work, a poly-disperse sea fog system is introduced. Such a sea fog layer comprises spherical water particles of different radii, where the radii are divided into eight radius regions. The attenuation, asymmetry factors, and absorption probabilities of the radiation interacting with sea fog particles in each radius region are computed using Mie theory. The scattering processes of the radiation in the poly-disperse sea fog layer are traced in our improved Monte Carlo (MC) simulation. This paper presents a new method (named "our method" hereafter) with the intention to provide more accurate calculations on the reflection and transmission when radiation propagates through poly-disperse sea fog media of two different refractive indices. Therein, we investigated the influence of liquid water contents and thicknesses of the poly-disperse sea fog layer on the reflectance and transmittance of the radiation. The results using our MC method compared with those using the previous MC method are also presented. Besides, with three different MC methods along with our method and the previous method, we also inspected how different MC methods affect the calculations of reflectance and transmittance, and it shows manifestation that our method has an advantage over the previous method. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Accession Number: WOS:000560936200088
PubMed ID: 32907063
ISSN: 1094-4087

Record 19 of 333
Title: Effects of axial ultrasonic vibration on grinding quality in peripheral grinding and end grinding of ULE
Author(s): Sun, GY (Sun, Guoyan); Shi, F (Shi, Feng); Ma, Z (Ma, Zhen)
Source: INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY  Volume: 109  Issue: 7-8  Pages: 2285-2298  DOI: 10.1007/s00170-020-05761-5  Published: AUG 2020  
Abstract: Axial ultrasonic vibration-assisted grinding has been widely proved to be effective on the ground quality as well as efficiency for hard and brittle materials. However, the deference of two typical modes, axial ultrasonic vibration-assisted peripheral grinding (AUPG, vibration directions are parallel to the ground surface) and axial ultrasonic vibration-assisted end grinding (AUEG, vibration directions are vertical to the ground surface), exerting on the grinding process has not yet been thoroughly investigated. In this paper, the single grain kinematic functions corresponding to AUPG and AUEG have been created to theoretically analyze the interactional mechanism of peripheral grinding and end grinding respectively. For AUPG and AUEG, their axial ultrasonic vibrations are capable of increasing the dynamic contact length, decreasing the chip thickness, but their different effects on grinding behavior need further investigation. A series of comparative experiments have been conducted subsequently, and the results show that under the identical material removal rate, axial vibration in AUPG and AUEG can decrease the grinding forces, while AUEG is with a lower one than AUPG with a factor of 39.80%. With regard to the ground surface quality and subsurface damage, AUPG shows a positive effect while AUEG shows a negative role. The grinding kinematic, grinding force, ground surface quality, and subsurface damage have been analyzed in terms of the axial ultrasonic vibration effect on the peripheral grinding and end grinding behavior theoretically and experimentally, the conclusion will be meaningful for researchers to choose the appropriate approach in applying axial ultrasonic vibration to grinding optical elements.
Accession Number: WOS:000556095100036
ISSN: 0268-3768
eISSN: 1433-3015

Record 20 of 333
Title: Shaping attosecond pulses by controlling the minima in high-order harmonic generation through alignment of CO2 molecules
Author(s): Jin, C (Jin, Cheng); Wang, SJ (Wang, Su-Ju); Zhao, X (Zhao, Xi); Zhao, SF (Zhao, Song-Feng); Lin, CD (Lin, C. D.)
Source: PHYSICAL REVIEW A  Volume: 101  Issue: 1  Article Number: 013429  DOI: 10.1103/PhysRevA.101.013429  Published: JAN 23 2020  
Abstract: We report a simple method for generating shaped attosecond pulses by using a CO2 molecule. Unlike most other molecules, owing to its unique energy and angle dependence and the presence of deep minima in the photoionization transition dipole moment, the shape of harmonic spectra, especially the position and depth of minima, can be readily controlled by tuning the degree of alignment. The sensitive alignment dependence of the minima is due to the coherent interference of a laser-induced dipole from each molecule when CO2 molecules are moderately aligned, but not when they are well aligned or when they are isotropically distributed. Such a sensitivity offers a simple way of controlling the spectral amplitude and phase of the generated harmonics and thus shaping the generated attosecond pulses, for example, producing structured attosecond pulses by splitting a single burst into two. We illustrate how such pulses are generated and how to characterize them. This method offers a simple way to shape attosecond pulses at the generation step. It can be easily implemented experimentally to generate attosecond pulses with strong phase variations for unique applications.
Accession Number: WOS:000509471100004
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Jin, Cheng  B-6479-2015  0000-0001-8445-2378 
Zhao, Song-Feng  P-8304-2014  0000-0002-3105-3872 
Zhao, Xi    0000-0003-3114-5416 
Lin, Chii Dong  D-7312-2012  0000-0003-4847-8938 
ISSN: 2469-9926
eISSN: 2469-9934

Record 21 of 333
Title: Design and Analysis of Hard X-Ray Microscope Employing Toroidal Mirrors Working at Grazing-Incidence
Author(s): Cui, Y (Cui, Ying); Yan, YD (Yan, Yadong); Wu, BJ (Wu, Bingjing); Li, Q (Li, Qi); He, JH (He, Junhua)
Source: INTERNATIONAL JOURNAL OF PATTERN RECOGNITION AND ARTIFICIAL INTELLIGENCE  Volume: 34  Issue: 4  Article Number: 2055010  DOI: 10.1142/S0218001420550101  Published: APR 2020  
Abstract: A high resolution microscope is designed for plasma hard X-ray (10-20 keV) imaging diagnosis. This system consists of two toroidal mirrors, which are nearly parallel, with an angle twice that of the grazing incidence angle and a plane mirror for spectral selection and correction of optical axis offset. The imaging characteristics of single toroidal mirror and double mirrors are analyzed in detail by the optical path function. The optical design, parameter optimization, image quality simulation and analysis of the microscope are carried out. The optimized hard X-ray microscope has a resolution better than 5 mu m at 1 mm object field of view. The experimental data shows that the variation of the resolution is smaller in the direction of incident angle decrease than that in the increasing direction.
Accession Number: WOS:000531872200009
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Cui, Ying    0000-0002-0256-6775 
ISSN: 0218-0014
eISSN: 1793-6381

Record 22 of 333
Title: Effect of annealing on the electrophysical properties of CdTe/HgCdTe passivation interface by the capacitance-voltage characteristics of the metal-insulator-semiconductor structures
Author(s): Wang, X (Wang, Xi); He, K (He, Kai); Chen, X (Chen, Xing); Li, Y (Li, Yang); Lin, C (Lin, Chun); Zhang, QY (Zhang, Qinyao); Ye, ZH (Ye, Zhenhua); Xin, LW (Xin, Liwei); Gao, GL (Gao, Guilong); Yan, X (Yan, Xin); Wang, G (Wang, Gang); Liu, YH (Liu, Yiheng); Wang, T (Wang, Tao); Tian, JS (Tian, Jinshou)
Source: AIP ADVANCES  Volume: 10  Issue: 10  Article Number: 105102  DOI: 10.1063/5.0021073  Published: OCT 1 2020  
Abstract: The capacitance-voltage characteristics of metal-insulator-semiconductor structures based on Hg1-xCdxTe (x = 0.218) with CdTe passivation are studied before and after the passivation annealing process. We found that after vacuum annealing at 300 degrees C for 24 h, the micromorphology of the passivation layer was significantly improved, and as the fixed charge density decreased from 1.3 x 10(12) cm(-2) to 1.0 x 10(10) cm(-2), the fast surface state density decreased from 2 x 10(13) cm(-2) eV(-1) to 3 x 10(12) cm(-2 )eV(-1), with a minimum value of 1.2 x 10(11) cm(-2) eV(-1). From these findings, combined with the secondary ion mass spectroscopy analysis, we conclude that the annealing process propagates an equivalent electrical surface for CdTe/HgCdTe uniformly from the principal physical interface to the inside of the bulk material, effectively improving the characteristics of the CdTe passivation layer. (C) 2020 Author(s).
Accession Number: WOS:000576989900002
eISSN: 2158-3226

Record 23 of 333
Title: Optical design of the visible telescope for the SVOM mission
Author(s): Fan, XW (Fan, Xuewu); Zou, GY (Zou, Gangyi); Qiu, YL (Qiu, Yulei); Pang, ZH (Pang, Zhihai); Zhao, H (Zhao, Hui); Chen, QF (Chen, Qinfang); Pan, Y (Pan, Yue); Yuan, H (Yuan, Hao)
Source: APPLIED OPTICS  Volume: 59  Issue: 10  Pages: 3049-3057  DOI: 10.1364/AO.386177  Published: APR 1 2020  
Abstract: This paper describes the optical design of the visible telescope (VT), which is the primary payload for the Chinese-French Space-based multi-band astronomical Variable Objects Monitor (SVOM) mission, for the detection and observation of high-redshift gamma-ray bursts. The VT aims at reaching a limiting magnitude of +22.5 Mv with the exposure time of 300 s in the 630 km Sun-synchronous orbit with an inclination of 30 degrees. The VT, also known as the fine guidance sensor for the SVOM, aims to measure the relative performance error (RPE) of the platform during the tracking and provide the RPE to the platform to correct its stability. The optical design is presented in this paper. The mirror manufacture and test results are presented. The optical system performance, tolerance budget, thermal analysis, and stray light design of VT are fully analyzed. Finally, the diffraction encircled energy and point source transmittance are tested in the lab for the finished telescope. (C) 2020 Optical Society of America
Accession Number: WOS:000526531100027
PubMed ID: 32400584
ISSN: 1559-128X
eISSN: 2155-3165

Record 24 of 333
Title: High-power erbium-doped fiber laser with a carbon nanotubes-doped sol-gel glass mode-locker
Author(s): Chen, ZD (Chen, Zhendong); Wang, YG (Wang, Yonggang); Lv, RD (Lv, Ruidong); Liu, SC (Liu, Sicong); Wang, J (Wang, Jiang); Wang, YS (Wang, Yishan)
Source: OPTICAL FIBER TECHNOLOGY  Volume: 58  Article Number: 102189  DOI: 10.1016/j.yofte.2020.102189  Published: SEP 2020  
Abstract: Generally, broadband absorbers has much non-saturable loss and low laser damage threshold, which limits the average output power of the fiber lasers mode locked by broadband absorbers. Exceptions are the absorbers in evanescent wave mode locking, in which way only weak laser passes through the absorber section. However, evanescent wave mode locking method needs to change the original structure of the fiber. Most of the commercial fiber-lasers adopt face-to-face passive mode-locking. Therefore, it is important to increase the damage threshold of the broadband absorbers. In this study, for the first time, a single-walled carbon nanotube (SWNT)-doped sol-gel glass composite absorber is fabricated using a low-temperature sol-gel method. The main component of the sol-gel glass is compact amorphous inorganic silicon-dioxide, which has high laser-damage threshold. The SWNT-doped sol-gel glass is integrated into the erbium-doped fiber (EDF) laser and mode-locking occurs at 1559 nm. The shortest pulse duration is 456 fs, and the maximum average output power is 110.65 mW. Compared to most EDF lasers based on broadband absorbers, the average output power is one of the highest values. The results indicate that encapsulating absorber in the inorganic sol-gel matrix is a promising method for fabricating high power ultrafast fiber laser type absorbers.
Accession Number: WOS:000596377400004
ISSN: 1068-5200
eISSN: 1095-9912

Record 25 of 333
Title: Remote Sensing Scene Classification by Gated Bidirectional Network
Author(s): Sun, H (Sun, Hao); Li, SY (Li, Siyuan); Zheng, XT (Zheng, Xiangtao); Lu, XQ (Lu, Xiaoqiang)
Source: IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING  Volume: 58  Issue: 1  Pages: 82-96  DOI: 10.1109/TGRS.2019.2931801  Published: JAN 2020  
Abstract: Remote sensing (RS) scene classification is a challenging task due to various land covers contained in RS scenes. Recent RS classification methods demonstrate that aggregating the multilayer convolutional features, which are extracted from different hierarchical layers of a convolutional neural network, can effectively improve classification accuracy. However, these methods treat the multilayer convolutional features as equally important and ignore the hierarchical structure of multilayer convolutional features. Multilayer convolutional features not only provide complementary information for classification but also bring some interference information (e.g., redundancy and mutual exclusion). In this paper, a gated bidirectional network is proposed to integrate the hierarchical feature aggregation and the interference information elimination into an end-to-end network. First, the performance of each convolutional feature is quantitatively analyzed and a superior combination of convolutional features is selected. Then, a bidirectional connection is proposed to hierarchically aggregate multilayer convolutional features. Both the top-down direction and the bottom-up direction are considered to aggregate multilayer convolutional features into the semantic-assist feature and appearance-assist feature, respectively, and a gated function is utilized to eliminate interference information in the bidirectional connection. Finally, the semantic-assist feature and appearance-assist feature are merged for classification. The proposed method can compete with the state-of-the-art methods on four RS scene classification data sets (AID, UC-Merced, WHU-RS19, and OPTIMAL-31).
Accession Number: WOS:000507307800006
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Sun, Hao  AAG-5676-2020   
Lu, Xiaoqiang    0000-0002-7037-5188 
Sun, Hao    0000-0002-1314-4957 
ISSN: 0196-2892
eISSN: 1558-0644

Record 1 of 333
Title: The analysis of electron scattering among multiplying layer in EBAPS using optimized Monte Carlo method
Author(s): Bai, JZ (Bai, Jinzhou); Bai, YL (Bai, Yonglin); Hou, X (Hou, Xun); Cao, WW (Cao, Weiwei); Yang, Y (Yang, Yang); Wang, B (Wang, Bo); Bai, XH (Bai, Xiaohong); Li, SQ (Li, Siqi)
Source: MODERN PHYSICS LETTERS B  Volume: 34  Issue: 34  Article Number: 2050398  DOI: 10.1142/S0217984920503984  Published: DEC 10 2020  
Abstract: Electron bombarded Active Pixel Sensor (EBAPS) is well known for its low noise in low-light level imaging, high mechanical integration, and a relatively low cost. It plays an important role in areas of the industrial process as well as the fundamental scientific research. However, the performance of EBAPS is intensively influenced by the structural parameters (i.e. the acceleration voltage between cathode and anode, thickness of the passivation layer, etc.). Due to the influence of these factors mentioned above, the performance of EBAPS is restricted to achieve its best condition. Herein, a model based on the optimized Monte Carlo method was proposed for effectively analyzing the scattering behavior of electrons within the electron multiplier layer. Unlike traditional simulation, which only deals with the electron scattering in longitudinal, in this paper, we simulate the electron scattering character not only in horizontal but also vertical among the multiplier layer, which would react to the influence induced by structural parameters more complete and more precise. Based on the proposed model, an experimental prototype of EBAPS is built and its detection sensitivity achieves 0.84 x 10(-4) lux under spectral response of ultraviolet (UV) spectroscopy, which improved a lot from our former design. The proposed model can be used for analyzing the influence induced by structural parameters, which exhibit enormous potential for exploring the high-gain EBAPS.
Accession Number: WOS:000599923700014
ISSN: 0217-9849
eISSN: 1793-6640

Record 2 of 333
Title: A novel approach for space debris recognition based on the full information vectors of star points
Author(s): Du, Y (Du, Yun); Wen, DS (Wen, Desheng); Liu, GZ (Liu, Guizhong); Qiu, S (Qiu, Shi); Yao, DL (Yao, Dalei); Yi, HW (Yi, Hongwei); Liu, MY (Liu, Meiying)
Source: JOURNAL OF VISUAL COMMUNICATION AND IMAGE REPRESENTATION  Volume: 71  Article Number: 102716  DOI: 10.1016/j.jvcir.2019.102716  Published: AUG 2020  
Abstract: The recognition and detection of space debris has become one of significant research fields recently. Compared with natural images, effective information are very few contained in star images. In the past years, the gray values of star points and the continuity of sequential star images are utilized by numerous algorithms to carry out the recognition and detection through fusion of consecutive star images, which have been achieved good performance. However, with the rapid increase of star image data, those algorithms seem to be inadequate in recognition ability. In this paper, we propose one novel approach based on the full information vectors of star points to recognize moving targets with the machine learning method which is never utilized in space debris recognition field. Besides gray values, we further deeply excavate the characteristics of each star point in a single frame by the equal probability density curve of Gaussian distribution. The elliptical pattern characteristic vectors of star points can be input into the machine learning method for classification of static stars and moving targets in a single frame. Finally, trajectories of moving targets can be determined within 3 frames by the full information vectors. Therefore, traditional processing methods are abandoned and the proposed brand new approach redefines the recognition technical route of space debris. The experimental results demonstrate that moving targets can be successfully recognized in a single frame and the coverage rate of moving targets can reach 100%. Compared with other traditional methods, the proposed approach has better performance and more robustness. (c) 2019 Elsevier Inc. All rights reserved.
Accession Number: WOS:000571423900009
ISSN: 1047-3203
eISSN: 1095-9076

Record 3 of 333
Title: Polarization grating based on diffraction phase microscopy for quantitative phase imaging of paramecia
Author(s): Zhang, ML (Zhang, Meiling); Ma, Y (Ma, Ying); Wang, Y (Wang, Yu); Wen, K (Wen, Kai); Zheng, JJ (Zheng, Juanjuan); Liu, LX (Liu, Lixin); Gao, P (Gao, Peng)
Source: OPTICS EXPRESS  Volume: 28  Issue: 20  Pages: 29775-29787  DOI: 10.1364/OE.404289  Published: SEP 28 2020  
Abstract: This study presents a polarization grating based diffraction phase microscopy (PG-DPM) and its application in bio-imaging. Compared with traditional diffraction phase microscopy (DPM) of which the fringe contrast is sample-dependent, the fringe contrast of PG-DPM is adjustable by changing the polarization of the illumination beam. Moreover, PG-DPM has been applied to real-time phase imaging of live paramecia for the first time. The study reveals that paramecium has self-helical forward motion characteristics, or more specifically, 77% clockwise and 23% anti-clockwise rotation when moving forward. We can envisage that PG-DPM will be applied to many different fields. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Accession Number: WOS:000581074800085
PubMed ID: 33114869
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Gao, Peng    0000-0002-5354-3944 
ISSN: 1094-4087

Record 4 of 333
Title: A Hybrid Demosaicking Algorithm for Area Scan Industrial Camera Based on Fuzzy Edge Strength and Residual Interpolation
Author(s): Sun, BY (Sun, Bangyong); Yuan, NZ (Yuan, Nianzeng); Zhao, Z (Zhao, Zhe)
Source: IEEE TRANSACTIONS ON INDUSTRIAL INFORMATICS  Volume: 16  Issue: 6  Pages: 4038-4048  DOI: 10.1109/TII.2019.2959069  Published: JUN 2020  
Abstract: Area scan cameras are widely used in industrial manufacturing for quality controlling, production monitoring, or defect inspection. The area scan cameras are normally integrated in a single sensor covered by the Bayer color filter array for RGB signal capturing, and the raw image with one channel for each pixel is obtained in one exposure. Therefore, it is significant to reconstruct the other two channels at each pixel which is called demosaicking. In this article, one hybrid demosaicking algorithm is proposed based on fuzzy edge strength and residual interpolation (RI) method. We first demosaic the G channel with one edge-directed filter and refine the high textured details by using fuzzy edge strength interpolation. Then, the RI is employed to calculate R and B channels, where G is used as the guide image for computing residuals. In the experiment, we evaluate our proposed method with nine prevalent interpolation-based algorithms on the IMAX and Kodak image datasets. The experimental results demonstrate that the proposed algorithm outperform the others by synthesizing the performance in peak signal-to-noise ratio, structural similarity, visual comparison, and computational time.
Accession Number: WOS:000526381800038
ISSN: 1551-3203
eISSN: 1941-0050

Record 5 of 333
Title: Visible and Near Infrared Spectral Analysis of the Lubricating Oil Dynamic Viscosity Based on Quantum Genetic-Neural Network Algorithm
Author(s): Liu, CY (Liu Chen-yang); Tang, XJ (Tang Xing-jia); Yu, T (Yu Tao); Wang, TS (Wang Tai-sheng); Lu, ZW (Lu Zhen-wu); Yu, WX (Yu Wei-xing)
Source: SPECTROSCOPY AND SPECTRAL ANALYSIS  Volume: 40  Issue: 5  Pages: 1634-1639  DOI: 10.3964/j.issn.1000-0593(2020)05-1634-06  Published: MAY 2020  
Abstract: Dynamic viscosity is one of the most important quality factors of lubricating oil. For the safety of high-speed railway, it is necessary to develop a real-time, fast and non-destructive method to monitor the status of the gearbox. Here we propose a new method that utilizes the quantum genetic-neural network algorithm to quantitatively analyze the visible and near-infrared spectra of lubricant acquired by a micro-spectrometer module. The method not only realizes non-destructive rapid real-time detection of the dynamic viscosity of high-speed railway transmission lubricating oil, but also further improves the prediction accuracy of the lubricating oil dynamic viscosity. Thanks to its excellent performance and small size, the miniature spectrometer has been widely used as a portable and nondestructive device. Here, two kinds of micro-spectral modules with visible/short-wave-infrared and near-infrared waveguide gratings are coupled with optical fibers and obtain a wide spectral range from 330 to 1 700 nm. Here the integrated waveguide and propagating makes the spectrometer compact and small. In experiment, a total of 78 lubricant samples with 13 different viscosity lubricants were prepared for spectral measurement by the micro-spectrometer. The raw spectral data was pre-processed using the Savitzky-Golay convolution smoothing and the first-order differentiation to eliminate the baseline drift and background noise. Next, principal component analysis and Mahalanobis distance algorithm were used to identify the samples outside the concentration boundary, and three out-of-bound samples were excluded. Finally, the BP neural network and the quantum genetic neural network methods were employed for quantitative analyses and the results are compared, respectively. The quantum genetic algorithm is a probabilistic evolutionary algorithm that combines the advantages of quantum computing and genetic algorithm. It uses the form of quantum chromosomes and quantum logic gates for global searching. Therefore, the quantum genetic algorithm can be used to optimize the weight and the threshold of neural network, and the modeling efficiency and accuracy can be improved significantly. In this paper, BP neural network algorithm and quantum genetic neural network algorithm were modeled and simulated respectively. Ten samples were randomly selected from 75 samples as prediction sets, and the remaining 65 were as modeling sets. In the quantum genetic algorithm, the population number was set to 40 and the termination algebra was 200. The optimization results showed that the algorithm could obtain the optimal solution quickly after training of only 81 generations. A comparison of the predicted results showed that the quantum genetic algorithm was much better than the BP neural network, the root mean square error of the prediction was significantly reduced from 0. 345 5 to 0. 029 4, and the coefficient of determination was increased from 0. 850 4 to 0. 979 9. This work has developed an effective method for compact, nondestructive, rapid and real-time detection of the dynamic viscosity of the lubricant and would find potential uses for the safety monitoring of high-speed trains.
Accession Number: WOS:000539411900054
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Yu, Weixing  G-3658-2012  0000-0002-3216-526X 
ISSN: 1000-0593

Record 6 of 333
Title: Attribute-Cooperated Convolutional Neural Network for Remote Sensing Image Classification
Author(s): Zhang, YL (Zhang, Yuanlin); Zheng, XT (Zheng, Xiangtao); Yuan, Y (Yuan, Yuan); Lu, XQ (Lu, Xiaoqiang)
Source: IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING  Volume: 58  Issue: 12  Pages: 8358-8371  DOI: 10.1109/TGRS.2020.2987338  Published: DEC 2020  
Abstract: Remote sensing image (RSI) classification is one of the most important fields in RSI processing. It is well known that RSIs are very complicated due to its various kinds of contents. Therefore, it is very difficult to distinguish different scene categories with similar visual contents, like desert and bare land. To address hard negative categories, an attribute-cooperated convolutional neural network (ACCNN) is proposed to exploit attributes as additional guiding information. First, the classification branch extracts convolutional neural network feature, which is then utilized to recognize the RSI scene categories. Second, the attribute branch is proposed to make the network distinguish scene categories efficiently. The proposed attribute branch shares feature extraction layers with the classification branch and makes the classification branch aware of extra attribute information. Finally, the relationship branch constraints the relationship between the classification branch and the attribute branch. To exploit the attribute information, three attribute-classification data sets are generated (AC-AID, AC-UCM, and AC-Sydney). Experimental results show that the proposed method is competitive to state-of-the-art methods. The data sets are available at https://github.com/CrazyStoneonRoad/Attribute-Cooperated-Classification-Data sets.
Accession Number: WOS:000594389800009
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Yuan, Yuan  ABB-2379-2020   
Zhang, Yuanlin  AAO-7260-2020  0000-0003-0960-3636 
Lu, Xiaoqiang    0000-0002-7037-5188 
ISSN: 0196-2892
eISSN: 1558-0644

Record 7 of 333
Title: Orientation-selective elliptic optical vortex array
Author(s): Wang, YK (Wang, Y. K.); Ma, HX (Ma, H. X.); Zhu, LH (Zhu, L. H.); Tai, YP (Tai, Y. P.); Li, XZ (Li, X. Z.)
Source: APPLIED PHYSICS LETTERS  Volume: 116  Issue: 1  Article Number: 011101  DOI: 10.1063/1.5128040  Published: JAN 6 2020  
Abstract: We propose an orientation-selective elliptic optical vortex array (OS-EOVA). Using multicoordinate (namely, polar, Cartesian, and elliptic) transformations, three kinds of operations applied on optical vortex elements (including location, rotation, and stretching) were executed to obtain the desired orientation in the observed plane. Then, exploiting the reverse design technique, the above-mentioned operations were mapped onto the initial execution plane via Fourier transform. Based on this, 1D and 2D OS-EOVAs were generated experimentally and the existence of optical vortices was verified. Specific OS-EOVAs were designed, possessing antenna array orientation as well as radial and azimuthal orientation. Compared to existing OVAs, the OS-EOVA provides an additional modulated dimension, i.e., orientation. This technique will open up some potential applications, such as complex manipulation of multiparticle systems and fabrication of micromaterials with orientation.
Accession Number: WOS:000505611500011
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Li, Xinzhong  P-7966-2018  0000-0002-6426-4043 
Ma, Haixiang  AAN-5676-2020  0000-0001-9422-9372 
ISSN: 0003-6951
eISSN: 1077-3118

Record 8 of 333
Title: A Method for Improving the Detection Accuracy of the Spot Position of the Four-Quadrant Detector in a Free Space Optical Communication System
Author(s): Wang, X (Wang, Xuan); Su, XQ (Su, Xiuqin); Liu, GZ (Liu, Guizhong); Han, JF (Han, Junfeng); Wang, KD (Wang, Kaidi); Zhu, WH (Zhu, Wenhua)
Source: SENSORS  Volume: 20  Issue: 24  Article Number: 7164  DOI: 10.3390/s20247164  Published: DEC 2020  
Abstract: In a free space optical communication system, the beacon light will lose most of its energy after long-distance transmission, and the background light from the universe will strongly interfere with it. The four-quadrant detector (4QD) has been widely used in optical communication systems as a high-precision spot position detection sensor. However, if the light signal falling on the 4QD is too weak, the electrical signal of the output position will be very weak, and it will easily be affected by or even submerged in noise. To solve this problem, we propose a method for improving the spot position detection accuracy. First, we analyzed the solution relationship between the actual position of the spot and the output signal of the 4QD, with a Gaussian spot as the incident light model. The output current signal of the detector was then transimpedance-amplified by an analog circuit and the output voltage signal with noise was digitally filtered. An error compensation factor and the gap size of the detector were introduced into the traditional spot position detection model. High-precision spot position information for the 4QD in a complex environment was then obtained using the improved spot position detection model. Experimental results show that the maximum spot position detection error for this method was only 0.0277 mm, and the root mean square error was 0.0065 mm, when the 4QD was in a high background noise environment. The spot position detection accuracy was significantly improved compared with traditional detection algorithms. Real-time detection can therefore be achieved in practical applications.
Accession Number: WOS:000603200300001
PubMed ID: 33327521
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Wang, Xuan    0000-0001-8445-1391 
Wang, Kaidi    0000-0001-8145-5530 
eISSN: 1424-8220

Record 9 of 333
Title: High Photocurrent Density and Continuous Electron Emission Characterization of a Multi-Alkali Antimonide Photocathode
Author(s): Dai, J (Dai, Jun); Ding, YK (Ding, Yikun); Ruan, CJ (Ruan, Cunjun); Xu, XY (Xu, Xiangyan); Liu, HL (Liu, Hulin)
Source: ELECTRONICS  Volume: 9  Issue: 12  Article Number: 1991  DOI: 10.3390/electronics9121991  Published: DEC 2020  
Abstract: High photocurrent density cathodes that enable small cross-section electron beams are required for high-power terahertz vacuum devices. Multi-alkali antimonide photocathodes may be well suited for generating sub-mm electron beam sources. This paper involves the repeatability, stability, uniformity, and linearity experiments of the multi-alkali antimonide photocathodes electron emission operations under a continuous-wave 450 nm laser with a bias voltage of 5000 V. The effect of heat, electric contact, and cathode surface roughness to emission characterizations is analyzed. The methods to maintain the high-current-density emission and avoid the fatigue of the photocathode are verified. The emission can be repeated with increased optical power. The stable photocurrent density of near 1 A/cm(2) and maximum current density of near 1.43 A/cm(2) is recorded. The continuous photocurrent density is significantly improved compared to the current density reported in traditional applications. It is found that the current curves measuring at different areas of the photocathode differ greatly after the laser power of 800 mW. The increase in current for some areas may be attributed to the conductive current caused by built-in electric fields between the emission rough area and its adjacent areas.
Accession Number: WOS:000602078800001
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Ruan, Cunjun    0000-0002-5248-9333 
eISSN: 2079-9292

Record 10 of 333
Title: Deep Convolutional Neural Network Phase Unwrapping for Fringe Projection 3D Imaging
Author(s): Liang, J (Liang, Jian); Zhang, JC (Zhang, Junchao); Shao, JB (Shao, Jianbo); Song, BF (Song, Bofan); Yao, BL (Yao, Baoli); Liang, RG (Liang, Rongguang)
Source: SENSORS  Volume: 20  Issue: 13  Article Number: 3691  DOI: 10.3390/s20133691  Published: JUL 2020  
Abstract: Phase unwrapping is a very important step in fringe projection 3D imaging. In this paper, we propose a new neural network for accurate phase unwrapping to address the special needs in fringe projection 3D imaging. Instead of labeling the wrapped phase with integers directly, a two-step training process with the same network configuration is proposed. In the first step, the network (network I) is trained to label only four key features in the wrapped phase. In the second step, another network with same configuration (network II) is trained to label the wrapped phase segments. The advantages are that the dimension of the wrapped phase can be much larger from that of the training data, and the phase with serious Gaussian noise can be correctly unwrapped. We demonstrate the performance and key features of the neural network trained with the simulation data for the experimental data.
Accession Number: WOS:000553188200001
PubMed ID: 32630246
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Yao, Baoli  AAB-4606-2021   
Shao, Jianbo  ABB-3995-2020   
Shao, Jianbo    0000-0003-1253-4096 
, Jian    0000-0002-0324-1497 
Yao, Baoli    0000-0002-1723-6680 
eISSN: 1424-8220

Record 11 of 333
Title: Biomimetic curved compound-eye camera with a high resolution for the detection of distant moving objects
Author(s): Xu, HR (Xu, Huangrong); Zhang, YJ (Zhang, Yuanjie); Wu, DS (Wu, Dengshan); Zhang, G (Zhang, Geng); Wang, ZY (Wang, Ziyuan); Feng, XP (Feng, Xiangpeng); Hu, BL (Hu, Bingliang); Yu, WX (Yu, Weixing)
Source: OPTICS LETTERS  Volume: 45  Issue: 24  Pages: 6863-6866  DOI: 10.1364/OL.411492  Published: DEC 15 2020  
Abstract: In this Letter, we demonstrate the design and fabrication of a biomimetic curved compound-eye camera (BCCEC) with a high resolution for detecting distant moving objects purpose. In contrast to previously reported compound-eye cameras, our BCCEC has two distinct features. One is that the ommatidia of the compound eye are deployed on a curved surface which makes a large field of view (FOV) possible. The other is that each ommatidium has a relatively large optical entrance and long focal length so that a distant object can be imaged. To overcome the mismatch between the curved focal plane formed by the curved compound eye and the planar focal plane of the CMOS image sensor (CIS), an optical relay subsystem is introduced between the compound eye and the CIS. As a result, a BCCEC with 127 ommatidia in the compound eye is designed and fabricated to achieve a large FOV of up to 98 degrees x 98 degrees. The experimental results show that objects with a size of 100 mm can be dearly resolved at a distance of 25 m. The capture of the motion trajectories of a moving object is also demonstrated, which makes it possible to detect and track the moving targets in a huge FOV for security surveillance purposes. (C) 2020 Optical Society of America
Accession Number: WOS:000599793600074
PubMed ID: 33325915
ISSN: 0146-9592
eISSN: 1539-4794

Record 12 of 333
Title: Spatiotemporal evolution and spectral character of second harmonic generation in optical microresonator
Author(s): Xu, X (Xu Xin); Jin, XY (Jin Xue-Ying); Hu, XH (Hu Xiao-Hong); Huang, XN (Huang Xin-Ning)
Source: ACTA PHYSICA SINICA  Volume: 69  Issue: 2  Article Number: 024203  DOI: 10.7498/aps.69.20191294  Published: JAN 20 2020  
Abstract: With the consideration of the second and the third order nonlinear effect, the Lugiato-Lefeve equation which describes the field evolution of the fundamental frequency wave and the second harmonic wave is introduced. Based on the Lugiato-Lefeve equation, the generation of the second harmonic wave in the SiN microresonator is analyzed, and the effect of the each parameter on the dual field is studied. Simulation results indicate that the stable field of the fundamental frequency wave is of flat top pulse, and the field of the second harmonic wave is of sinusoidal distribution. When the detuning parameter increases, the power of the dual wave inside the microresonator oscillates, and the stable power weakens, the stable light field is periodically varied. Moreover, the chaos emerges as detuning parameter becomes large. The stable field can be generated in the microresonator with the weak pump power. However, because of the high pump power, the dispersion and nonlinear effect are enhanced, resulting in the periodic light field. Furthermore, the oscillation of the dual power curve is aggravated, as the pump power increases. In addition, the turning patterns can be observed by choosing the special dimension of microresonator. Theoretical analysis results are significant for studying the generation of the second harmonic wave in the microresonator.
Accession Number: WOS:000527796800009
ISSN: 1000-3290

Record 13 of 333
Title: Supervised deep hashing with a joint deep network
Author(s): Chen, YX (Chen, Yaxiong); Lu, XQ (Lu, Xiaoqiang); Li, XL (Li, Xuelong)
Source: PATTERN RECOGNITION  Volume: 105  Article Number: 107368  DOI: 10.1016/j.patcog.2020.107368  Published: SEP 2020  
Abstract: Hashing has gained great attention in large-scale image retrieval due to efficient storage and fast search. Recently, many deep hashing approaches have achieved good results since deep neural network owns powerful learning capability. However, these deep hashing approaches can perform deep features learning and binary-like codes learning synchronously, the information loss between binary-like codes and binary codes will increase due to the binarization operation. A further deficiency is that binary-like codes learning based on deep feature representations is a shallow learning procedure, which cannot fully exploit deep feature representations to generate hash codes. To solve the above problems, we propose a Deep Learning Supervised Hashing (DLSH) method which adopts deep structure to learn binary codes based on deep feature representations for large-scale image retrieval. Specifically, we integrate deep features learning module, deep mapping module and binary codes learning module in one unified architecture. The network is trained in an end-to-end way. In addition, a new objective function is designed to preserve the balancing property and semantic similarity of binary codes by incorporating the semantic similarity term and the balanceable property term. Experimental results on four benchmarks demonstrate that the proposed approach outperforms several state-of-the-art hashing methods. (C) 2020 Elsevier Ltd. All rights reserved.
Accession Number: WOS:000539457100029
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Li, Xuelong  ABF-3381-2020   
Chen, Yaxiong  AAR-7285-2020   
Lu, Xiaoqiang    0000-0002-7037-5188 
Chen, Yaxiong    0000-0002-2903-6723 
ISSN: 0031-3203
eISSN: 1873-5142

Record 14 of 333
Title: W-shaped common-path interferometer
Author(s): Wei, RY (Wei, Ruyi); Di, LM (Di, Lamei); Qiao, NZ (Qiao, Nianzu); Chen, SS (Chen, Shasha)
Source: APPLIED OPTICS  Volume: 59  Issue: 34  Pages: 10973-10979  DOI: 10.1364/AO.411150  Published: DEC 1 2020  
Abstract: We present a novel static W-shaped common-path interferometer. In particular, the W-shaped common-path corner-cube retroreflector interferometer (W-CPRI) is introduced via detailed analysis of its working principles and performance. It comprises two corner-cube retroreflectors (CCRs), a reflecting mirror (RM), and a beam splitter. For each interference output of an ideal W-CPRI, the two beams recombine and have the same output direction, including a tilted CCR. In a deformed W-CPRI structure, an optical path difference can be produced by inserting an optical element that changes the optical path in the interferometer arm of the W-CPRI. The posture deviations of the RM and the CCRs in the W-CPRI are analyzed. In addition, a proof-of-concept experiment is conducted, with the stability analyzed using the fringe similarity method. The average cosine similarity is 0.9953, revealing that this W-CPRI has high stability and strong coherence while avoiding the tilt and displacement of the interferometer arm. (C) 2020 Optical Society of America
Accession Number: WOS:000595631500042
PubMed ID: 33361920
ISSN: 1559-128X
eISSN: 2155-3165

Record 15 of 333
Title: Photochemical response triggered by ultrashort laser Gaussian-Bessel beams in photo-thermo-refractive glass
Author(s): Wang, X (Wang, Xu); Zhang, GD (Zhang, Guodong); Zhang, YJ (Zhang, Yunjie); Xie, XP (Xie, Xiaoping); Cheng, GH (Cheng, Guanghua); Li, WN (Li, Weinan)
Source: OPTICS EXPRESS  Volume: 28  Issue: 21  Pages: 31093-31102  DOI: 10.1364/OE.401905  Published: OCT 12 2020  
Abstract: Photosensitivity in photo-thermo-refractive (PTR) glass can be triggered by UV and near-infrared fs laser irradiation. Here we focus on the nonlinear photochemical process triggered by ultrashort laser Gaussian-Bessel beams. The transmission and absorption spectra show that the primary difference between UV and fs laser exposure is the formation of color centers and kinetic process of silver nanoparticles growth. It is contributed to the nonlinear ionization of PTR glass matrix and thermal effects during interaction of glass matrix and ultrashort laser pulses. Transmission electron microscopy verifies the generation of nanoscale crystals in the irradiated region, and X-ray diffraction shows the existence of quartz crystal and NaF after laser irradiation and thermal treatment. Moreover, the dependence of photochemical reaction on laser parameters is investigated, as well as the tailoring of silver nanoparticles. On this basis, volume Bragg gratings with ultrashort laser Gaussian-Bessel beams are inscribed as an application which possess good diffraction characteristics. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Accession Number: WOS:000581089500054
PubMed ID: 33115091
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Zhang, Guodong    0000-0001-9466-8105 
ISSN: 1094-4087

Record 16 of 333
Title: High-resolution and large field-of-view Fourier ptychographic microscopy and its applications in biomedicine
Author(s): Pan, A (Pan, An); Zuo, C (Zuo, Chao); Yao, BL (Yao, Baoli)
Source: REPORTS ON PROGRESS IN PHYSICS  Volume: 83  Issue: 9  Article Number: 096101  DOI: 10.1088/1361-6633/aba6f0  Published: SEP 2020  
Abstract: Fourier ptychographic microscopy (FPM) is a promising and fast-growing computational imaging technique with high resolution, wide field-of-view (FOV) and quantitative phase recovery, which effectively tackles the problems of phase loss, aberration-introduced artifacts, narrow depth-of-field and the trade-off between resolution and FOV in conventional microscopy simultaneously. In this review, we provide a comprehensive roadmap of microscopy, the fundamental principles, advantages, and drawbacks of existing imaging techniques, and the significant roles that FPM plays in the development of science. Since FPM is an optimization problem in nature, we discuss the framework and related work. We also reveal the connection of Euler's formula between FPM and structured illumination microscopy. We review recent advances in FPM, including the implementation of high-precision quantitative phase imaging, high-throughput imaging, high-speed imaging, three-dimensional imaging, mixed-state decoupling, and introduce the prosperous biomedical applications. We conclude by discussing the challenging problems and future applications. FPM can be extended to a kind of framework to tackle the phase loss and system limits in the imaging system. This insight can be used easily in speckle imaging, incoherent imaging for retina imaging, large-FOV fluorescence imaging, etc.
Accession Number: WOS:000563505200001
PubMed ID: 32679569
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Zuo, Chao  D-7273-2014  0000-0002-1461-0032 
Yao, Baoli  AAB-4606-2021   
ISSN: 0034-4885
eISSN: 1361-6633

Record 17 of 333
Title: A novel photostable near-infrared-to-near-infrared fluorescent nanoparticle for in vivo imaging
Author(s): Fan, Q (Fan, Qi); Cui, XX (Cui, Xiaoxia); Wang, Q (Wang, Quan); Gao, P (Gao, Peng); Shi, SJ (Shi, Shengjia); Wen, WH (Wen, Weihua); Guo, HT (Guo, Haitao); Xu, YT (Xu, Yantao); Peng, B (Peng, Bo)
Source: JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART B-APPLIED BIOMATERIALS  Volume: 108  Issue: 7  Pages: 2912-2924  DOI: 10.1002/jbm.b.34622  Early Access Date: MAY 2020   Published: OCT 2020  
Abstract: Water-soluble K5HoLi2F10 (KHLF) nanoprobes with the excitation and emission both in the near-infrared (NIR) region were developed and first demonstrated for in vivo imaging of living mice. The PEG(400) coating endows the nanoprobes with good water solubility and biocompatibility. Doping with Ho3+ ions is capable of emitting NIR fluorescence with two peaks centered, respectively, at 887 and 1,180 nm once excited by a 808 nm laser; meanwhile, it also possess good photothermal conversion performance. The KHLF matrix with specifically structure of large ion-distance and low photon energy imparts the nanoprobes low quenching effect and excellent photostability (fluorescence decrease <5% upon 120 min illumination of 808 nm continuous laser with a power density of 1 W/cm(2)). The nanoparticles (NPs) were tested for in vitro bioimaging with living mice. The results show the NPs have low biotoxicity, rapid metabolism, normal biodistribution, together with the photothermal imaging performance and a high-contrast fluorescence images (signal-to-background ratio of 14:1). The superior performances of these nanoprobes in vivo imaging of mice proclaim the great potential of this type of probe for high-contrast imaging and photothermal treatment in practical applications.
Accession Number: WOS:000531096800001
PubMed ID: 32386265
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Cui, Xiaoxia    0000-0001-5629-6312 
ISSN: 1552-4973
eISSN: 1552-4981

Record 18 of 333
Title: Actuation Modeling of Ionic-Polymer Metal Composite Actuators Using Micromechanics Approach
Author(s): Yang, L (Yang, Liang); Zhang, DS (Zhang, Dongsheng); Wang, H (Wang, Hong); Zhang, XN (Zhang, Xining)
Source: ADVANCED ENGINEERING MATERIALS  Volume: 22  Issue: 12  Article Number: 2000537  DOI: 10.1002/adem.202000537  Early Access Date: JUL 2020   Published: DEC 2020  
Abstract: Herein, the movement of hydrated cations in ionic-polymer metal composite (IPMC) is analyzed by the micromechanics method. Based on the mechanism of IPMC, the migration of hydrated cations is in a step-by-step order, and the aggregation of hydrated cations on the cathode side results in the bending of IPMC toward the anode. The physical models of the maximum displacement and maximum blocking force of IPMC are established, the Pt IPMCs are prepared by chemical deposition, and the calculated values are compared with the experimental values. The results indicate that there is water electrolysis in the actuation process of IPMC, which inhibits the migration of ions on the electrode surface and has a negative effect on the property of IPMC. By comparing the calculated value of the model with the experimental value, it is found that there is good consistency. The mathematical statistical metrics, mean absolute error, mean relative error, determination coefficient, correlation coefficient, mean square error, root mean square error, and relative root mean square error, are used to assess the model capability, which puts a theoretical foundation for the prediction and simulation of IPMC and promotes the further development and practical application of IPMC.
Accession Number: WOS:000553392900001
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Yang, Liang  AAO-5599-2020  0000-0001-5340-463X 
ISSN: 1438-1656
eISSN: 1527-2648

Record 19 of 333
Title: Orthogonal optimum design of parameters of flux used for low carbon bainitic steel
Author(s): Yang, L (Yang, Liang); Wang, H (Wang, Hong)
Source: APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING  Volume: 126  Issue: 7  Article Number: 538  DOI: 10.1007/s00339-020-03730-z  Published: JUN 18 2020  
Abstract: L-8(2(7)) orthogonal test table is applied to design eight kinds of flux, and arranged with SiO2, ZrO(2)and TiO(2)as three factors. The microstructure, morphology and mechanical properties of low carbon bainitic steels are investigated by means of optical microscope, scanning electron microscope, transmission electron microscope, tensile testing machine and instrumented drop weight impact tester with oscilloscope. The results indicate that the optimum composition rate is as follows: 20% SiO2, 10% ZrO2, and 6% TiO2, and the interaction between ZrO(2)and TiO(2)is obvious. The microstructure of deposited metal of low carbon bainitic steel is mainly formed by acicular ferrite and granular bainite. The acicular ferrite is paralleled distribution, and plenty of fine sheet Martensitic-Austenitic constituents are dispersing, which can hinder crack propagation and improve strength and toughness. The impact energy is up to 109.7 J at - 20 degrees C, and the ratio of brittle fracture termination load to maximum impact load is 0.378, ensuring excellent crack arrest toughness.
Accession Number: WOS:000546969700004
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Yang, Liang  AAO-5599-2020  0000-0001-5340-463X 
ISSN: 0947-8396
eISSN: 1432-0630

Record 20 of 333
Title: Research on the X-ray wavelength division multiplexing technology for blackout region communication
Author(s): Li, Y (Li, Yao); Su, T (Su, Tong); Sheng, LZ (Sheng, Lizhi); Xu, N (Xu, Neng); Zhao, BS (Zhao, Baosheng)
Source: OPTICA APPLICATA  Volume: 50  Issue: 4  Pages: 619-632  DOI: 10.37190/oa200409  Published: 2020  
Abstract: After the concept of X-ray communication was proposed, its application in complex electromagnetic environment has received more attention, such as data transmission in re-enter special electromagnetic condition. In this article, a new type of X-ray source was introduced firstly, which was expected to generate multiple characteristic lines and achieve wavelength division multiplexing technology in X-ray band. Then an experimental platform was built for analyzing transmission characteristics of X-ray photon in various plasma media. Finally, the calculation model for a link power equation was given. Experiment results show that transmittance of 8-18 keV X-ray signal is relatively stable, atomic numbers from 29 to 42 are the most suitable materials for wavelength division multiplexing, the X-ray communication system is expected to realize about 200 kbps data transmission rate in adjacent space.
Accession Number: WOS:000607595500009
ISSN: 0078-5466
eISSN: 1899-7015

Record 21 of 333
Title: Dissipative soliton operation of a diode-pumped Yb: KGW solid-state laser in the all-positive-dispersion regime
Author(s): Li, GY (Li, Guangying); Lou, R (Lou, Rui); Wang, X (Wang, Xu); Sun, Z (Sun, Zhe); Wang, YS (Wang, Yishan); Xie, XP (Xie, Xiaoping); Zhang, GD (Zhang, Guodong); Cheng, GH (Cheng, Guanghua)
Source: OPTICAL ENGINEERING  Volume: 59  Issue: 6  Article Number: 066105  DOI: 10.1117/1.OE.59.6.066105  Published: JUN 2020  
Abstract: We report on the dissipative soliton operation of a diode-pumped single-crystal bulk Yb:KGW laser oscillator in the all-positive-dispersion regime. Stable passively mode-locked pulses with strong positive chirp and steep spectral edges are obtained. The spectral centering at 1038.6 nm has a bandwidth of about 6.9 nm, and the chirped pulses have a pulse duration of 4.317 ps. The maximum average power can be up to 2.07 W when pumped by absorbed pump power of 5.3 W. The mode-locked slope efficiency and optical-optical conversion efficiency are shown to be 62% and 39%, respectively. Considering the pulse repetition rate with a value of 52 MHz, the corresponding pulse energy is estimated to be 39.8 nJ. (C) 2020 Society of Photo-Optical Instrumentation Engineers (SPIE)
Accession Number: WOS:000546929000051
Conference Title: Annual International Saratov Fall Meeting (SFM)
Conference Date: SEP 23-27, 2019
Conference Location: Saratov, RUSSIA
Conference Sponsors: Saratov State Univ, Bauman Moscow State Tech Univ
ISSN: 0091-3286
eISSN: 1560-2303

Record 22 of 333
Title: Optical vortex with multi-fractional orders
Author(s): Hu, JT (Hu, Juntao); Tai, YP (Tai, Yuping); Zhu, LH (Zhu, Liuhao); Long, ZX (Long, Zixu); Tang, MM (Tang, Miaomiao); Li, HH (Li, Hehe); Li, XZ (Li, Xinzhong); Cai, YJ (Cai, Yangjian)
Source: APPLIED PHYSICS LETTERS  Volume: 116  Issue: 20  Article Number: 201107  DOI: 10.1063/5.0004692  Published: MAY 18 2020  
Abstract: Recently, optical vortices (OVs) have attracted substantial attention because they can provide an additional degree of freedom, i.e., orbital angular momentum (OAM). It is well known that the fractional OV (FOV) is interpreted as a weighted superposition of a series of integer OVs containing different OAM states. However, methods for controlling the sampling interval of the OAM state decomposition and determining the selected sampling OAM state are lacking. To address this issue, in this Letter, we propose a FOV by inserting multiple fractional phase jumps into whole phase jumps (2 pi), termed as a multi-fractional OV (MFOV). The MFOV is a generalized FOV possessing three adjustable parameters, including the number of azimuthal phase periods (APPs), N; the number of whole phase jumps in an APP, K; and the fractional phase jump, alpha. The results show that the intensity and OAM of the MFOV are shaped into different polygons based on the APP number. Through OAM state decomposition and OAM entropy techniques, we find that the MFOV is constructed by sparse sampling of the OAM states, with the sampling interval equal to N. Moreover, the probability of each sampling state is determined by the parameter alpha, and the state order of the maximal probability is controlled by the parameter K, as K * N. This work presents a clear physical interpretation of the FOV, which deepens our understanding of the FOV and facilitates potential applications, especially for multiplexing technology in optical communication based on OAM.
Accession Number: WOS:000536235800001
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Li, Xinzhong  P-7966-2018  0000-0002-6426-4043 
Li, Hehe  AAN-9043-2021   
ISSN: 0003-6951
eISSN: 1077-3118

Record 23 of 333
Title: 3D waveguide element fabrication in Gorilla glass by an ultrafast laser
Author(s): Lv, J (Lv, Jing); Wang, KD (Wang, Kedian); Cheng, GH (Cheng, Guanghua)
Source: APPLIED OPTICS  Volume: 59  Issue: 27  Pages: 8242-8246  DOI: 10.1364/AO.401341  Published: SEP 20 2020  
Abstract: Waveguide fabrication with an ultrafast laser system and the mechanism of index modification have been investigated in Corning Gorilla glass. Type I waveguides were obtained when the pulse duration was in the range of 250 fs to 15 ps. With the increase of pulse energy, single-mode waveguides converted to ring-mode waveguides. The variation tendency of Raman peak at 580 cm(-1) band is nonmonotonic with the increase of pulse energy, and the negative index change appears finally in the waveguide core. The alkali ions migrated towards the outside with different diffusivities after the laser irradiation. Finally, bend waveguides and hexagon-link waveguide connectors were produced. (C) 2020 Optical Society of America
Accession Number: WOS:000571489300027
PubMed ID: 32976408
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Lv, Jing    0000-0002-9291-6643 
ISSN: 1559-128X
eISSN: 2155-3165

Record 24 of 333
Title: Property of Nafion-ionic polymer-metal composites based on Mori-Tanaka methodology and gradient mechanics
Author(s): Yang, L (Yang, Liang); Zhang, DS (Zhang, Dongsheng); Zhang, XN (Zhang, Xining); Wang, H (Wang, Hong)
Source: APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING  Volume: 126  Issue: 8  Article Number: 633  DOI: 10.1007/s00339-020-03807-9  Published: JUL 22 2020  
Abstract: Ionic polymer-metal composite (IPMC) actuators are a class of electroactive polymer composites that exhibit some interesting electromechanical characteristics such as low voltage actuation, large displacements, and benefit from low density and elastic modulus. Elastic modulus and surface resistance are basic properties of IPMCs that play a role in almost all practical applications of these materials. The prediction of the elastic modulus and surface resistance is of extreme importance to better grasp the mechanical behavior of IPMCs and to evaluate the success of the design. This paper has proposed a theoretical framework for predicting the elastic modulus and surface resistance of copper electrodes IPMCs. A five layers analytical assemblage model is introduced for the IPMCs relied upon improved classical lamination theory. The depositional metallic atoms were used as the exterior layer, the ionic polymer was used as the middle layer, and the material between the two layers was a gradient layer. Based on Mori-Tanaka methodology and gradient mechanics, the overall elastic properties of composites are obtained and lie between those obtained from the experiment. The prediction showed a good agreement with the experimental elastic modulus values with a maximum deviation of less than 10%. The overall results have provided useful insight into the elastic modulus and surface resistance effects to the properties of the IPMC. This would open further opportunities toward the higher application of IPMC.
Accession Number: WOS:000551112700001
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Yang, Liang  AAO-5599-2020  0000-0001-5340-463X 
ISSN: 0947-8396
eISSN: 1432-0630

Record 25 of 333
Title: Atypical Value-Driven Selective Attention in Young Children With Autism Spectrum Disorder
Author(s): Wang, Q (Wang, Quan); Chang, J (Chang, Joseph); Chawarska, K (Chawarska, Katarzyna)
Source: JAMA NETWORK OPEN  Volume: 3  Issue: 5  Article Number: e204928  DOI: 10.1001/jamanetworkopen.2020.4928  Published: MAY 6 2020  
Abstract: Question Is there an association between value learning and atypical selective attention in young children with autism spectrum disorder? Findings This case-control study included 115 preschoolers with autism spectrum disorder, developmental delay, or typical development whose selective attention was examined after a value learning protocol in social and nonsocial domains. Unlike comparison groups, children with autism spectrum disorder showed strong evidence for value learning in the nonsocial domain but not in the social domain. Meaning Atypical selective attention in autism spectrum disorder is associated with enhanced value learning in the nonsocial domain and with poor value learning in the social domain, suggesting that value learning may represent a novel treatment target in autism spectrum disorder.
Importance Enhanced selective attention toward nonsocial objects and impaired attention to social stimuli constitute key clinical features of autism spectrum disorder (ASD). Yet, the mechanisms associated with atypical selective attention in ASD are poorly understood, which limits the development of more effective interventions. In typically developing individuals, selective attention to social and nonsocial stimuli is associated with the informational value of the stimuli, which is typically learned over the course of repeated interactions with the stimuli. Objective To examine value learning (VL) of social and nonsocial stimuli and its association with selective attention in preschoolers with and without ASD. Design, Setting, and Participants This case-control study compared children with ASD vs children with developmental delay (DD) and children with typical development (TD) recruited between March 3, 2017, and June 13, 2018, at a university-based research laboratory. Participants were preschoolers with ASD, DD, or TD. Main Outcomes and Measures Procedure consisted of an eye-tracking gaze-contingent VL task involving social (faces) and nonsocial (fractals) stimuli and consisting of baseline, training, and choice test phases. Outcome measures were preferential attention to stimuli reinforced (high value) vs not reinforced (low value) during training. The hypotheses were stated before data collection. Results Included were 115 preschoolers with ASD (n = 48; mean [SD] age, 38.30 [15.55] months; 37 [77%] boys), DD (n = 31; mean [SD] age, 45.73 [19.49] months; 19 [61%] boys), or TD (n = 36; mean [SD] age, 36.53 [12.39] months; 22 [61%] boys). The groups did not differ in sex distribution; participants with ASD or TD had similar chronological age; and participants with ASD or DD had similar verbal IQ and nonverbal IQ. After training, the ASD group showed preference for the high-value nonsocial stimuli (mean proportion, 0.61 [95% CI, 0.56-0.65]; P < .001) but not for the high-value social stimuli (mean proportion, 0.51 [95% CI, 0.46-0.56]; P = .58). In contrast, the DD and TD groups demonstrated preference for the high-value social stimuli (DD mean proportion, 0.59 [95% CI, 0.54-0.64]; P = .001 and TD mean proportion, 0.57 [95% CI, 0.53-0.61]; P = .002) but not for the high-value nonsocial stimuli (DD mean proportion, 0.52 [95% CI, 0.44-0.59]; P = .64 and TD mean proportion, 0.50 [95% CI, 0.44-0.57]; P = .91). Controlling for age and nonverbal IQ, autism severity was positively correlated with enhanced learning in the nonsocial domain (r = 0.22; P = .03) and with poorer learning in the social domain (r = -0.26; P = .01). Conclusions and Relevance Increased attention to objects in preschoolers with ASD may be associated with enhanced VL in the nonsocial domain. When paired with poor VL in the social domain, enhanced value-driven attention to objects may play a formative role in the emergence of autism symptoms by altering attentional priorities and thus learning opportunities in affected children.
This case-control study examines value learning of social and nonsocial stimuli and its association with selective attention in preschoolers with and without autism spectrum disorder.
Accession Number: WOS:000534036000006
PubMed ID: 32374399
ISSN: 2574-3805

Record 1 of 333
Title: Resist-free nanoimprinting on optical fibers for plasmonic optrodes
Author(s): Jia, PP (Jia, Peipei); Kong, DP (Kong, Depeng); Ebendorff-Heidepriem, H (Ebendorff-Heidepriem, Heike)
Source: APPLIED MATERIALS TODAY  Volume: 20  Article Number: 100751  DOI: 10.1016/j.apmt.2020.100751  Published: SEP 2020  
Abstract: Nanostructure patterning on optical fibers enables miniaturized optrodes for photonic and plasmonic applications. Here we report a direct nanoimprint technique to produce high-quality nanostructure arrays on optical fiber endfaces. It has only one single step: imprinting optical fiber tips against a mold with nanostructures at the elevated temperature. This new method abandons resist used in traditional fiber imprinting methods. Hundreds of fibers can be shaped simultaneously with one mold within minutes. The imprinted nanostructure arrays on optical fibers are transformed into plasmonic optrodes through metal deposition. Variation of imprint depths and mold patterns allows tailoring of the plasmonic resonances of these nanostructure arrays for high-performance refractometric sensing and on-fiber polarization. The sensitivity of 690 nm/RIU and figure of merit of 50 are both among the highest values for similar plasmonic nanostructure arrays. This resist-free nanoimprint paves the way towards a low-cost and high-throughput realization of plasmonic optrodes and their wide applications. (c) 2020 Elsevier Ltd. All rights reserved.
Accession Number: WOS:000598356100006
ISSN: 2352-9407

Record 2 of 333
Title: Theoretical and experimental investigation of secondary electron emission characteristics of ALD-ZnO conductive films
Author(s): Zhu, XP (Zhu, Xiangping); Guo, JJ (Guo, Junjiang); Cao, WW (Cao, Weiwei); Liu, LT (Liu, Lutao); Zhang, GW (Zhang, Guangwei); Sun, X (Sun, Xin); Zhao, W (Zhao, Wei); Si, JH (Si, JinHai)
Source: JOURNAL OF APPLIED PHYSICS  Volume: 128  Issue: 6  Article Number: 065102  DOI: 10.1063/5.0014590  Published: AUG 14 2020  
Abstract: Microchannel plates (MCPs) are widely utilized as key device components in various photomultipliers; however, the performance of MCPs cannot be further improved by traditional processing. Atomic layer deposition (ALD) is a promising route to prepare a composite conductive layer and secondary electron emission (SEE) layer structure on the inner wall of the MCP. Moreover, ZnO is an essential component of a composite conductive layer, which is located at the bottom of the SEE layer and significantly influences the SEE coefficient, which, in turn, affects the gain performance of MCPs. Herein, ALD is used to deposit different thicknesses of ZnO films (1-50nm) on an Si substrate, resulting in an ZnO/Si double-layer film structure. The relationship between the SEE coefficient and the primary electron energy of ZnO films with different thicknesses was established. The maximum secondary electron yield value of 2.04 is achieved at a film thickness of 30nm. Moreover, Dionne's SEE model and theory of semiconductors are used to simulate and verify the experimental results. These results provide useful guidelines for the development of ALD-MCPs.
Accession Number: WOS:000562763000002
ISSN: 0021-8979
eISSN: 1089-7550

Record 3 of 333
Title: Design of a Low Noise Area Array CCD Imaging System for Exoplanet Search
Author(s): Di, LM (Di, Lamei); Liu, H (Liu, Hong); Wei, RY (Wei, Ruyi); Qiao, NZ (Qiao, Nianzu); Chen, SS (Chen, Shasha)
Source: JOURNAL OF IMAGING SCIENCE AND TECHNOLOGY  Volume: 64  Issue: 3  Article Number: 030504  DOI: 10.2352/J.ImagingSci.Technol.2020.64.3.030504  Published: MAY 2020  
Abstract: The search for exoplanets is a focal topic in astronomy. Since the signal from the detected target is very weak, the imaging system needs to have ultra-low readout noise. Therefore, a low noise charge-coupled diode (CCD) imaging system for exoplanet search (LNCIS) is proposed. Based on the area array CCD (TH7888A), the circuit and timing drive of LNCIS are designed. Especially, the application of correlation dual sampling (CDS) and asynchronous first-in, first-out (FIFO) memory can effectively suppress the correlation noise of the image signal. Moreover, this article proposes a fully differential double correlation sampling method, which can achieve better sampling effect and can better eliminate common-mode noise, improve dynamic range, and achieve high-quality image signal output. In addition, an independent counting method for adjusting the exposure time is proposed, which satisfies the requirements of the long exposure time of the imaging system, so that the CCD can be provided an independent and adjustable exposure time in the photosensitive stage. The LNCIS uses the FPGA (ZYNQ7000) as the core control device to produce the timing according to the function of the system. Finally, the experimental results show that the real-time image acquisition is achieved under the condition that the CCD readout clock frequency is 20 MHz. It is verified that the circuit and timing drive of the imaging system can meet the design requirements. (C) 2020 Society for Imaging Science and Technology.
Accession Number: WOS:000549338700006
ISSN: 1062-3701
eISSN: 1943-3522

Record 4 of 333
Title: A Highly Cost-Efficient Large-Scale Uniform Laminar Plasma Jet Array Enhanced by V-I Characteristic Modulation in a Non-Self-Sustained Atmospheric Discharge
Author(s): Li, J (Li, Jing); Wang, J (Wang, Jing); Lei, BY (Lei, Bingying); Zhang, TY (Zhang, Tongyi); Tang, J (Tang, Jie); Wang, YS (Wang, Yishan); Zhao, W (Zhao, Wei); Duan, YX (Duan, Yixiang)
Source: ADVANCED SCIENCE  Volume: 7  Issue: 6  Article Number: 1902616  DOI: 10.1002/advs.201902616  Early Access Date: JAN 2020   Published: MAR 2020  
Abstract: Developing cost-efficient large-scale uniform plasma jets represents a significant challenge for high performance in material processing and plasma medicine. Here, a V-I characteristic modulation approach is proposed to reduce the discharge power and increase the plasma scale and chemical activity in non-self-sustained atmospheric direct-current discharges. The electric field in discharge space is optimized to fundamentally empower simultaneously initiating all discharge cells far below Townsend breakdown potential and stably sustaining each plasma jet at low voltage. These strategies create a crucial step to fabricating a flexible and compact low-power large-scale uniform laminar plasma jet array (LPJA) with high activity in cheap argon. The mechanisms behind the discharge enhancement are revealed by combining V-I characteristic examination and a modulation model. Compared with conventional arrays, this LPJA possesses the widest size (90 mm) and raises its uniformity from 30% to 97%. Comparing different discharge modes shows that the LPJA scale is surprisingly increased nearly by 4 times with the discharge power reduced from 7.4 to 4.8 W. The methodology provides a highly cost-efficient roadmap to break through the bottleneck of restricting low-power discharge, large-gap discharge, large-scale discharge, parallel-multi-electrode discharge, and uniform discharge together. This advance will meet the urgent need for various plasma applications.
Accession Number: WOS:000506259400001
PubMed ID: 32195087
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Duan, Yixiang    0000-0002-2333-4586 
Tang, Jie    0000-0003-2162-6830 
eISSN: 2198-3844

Record 5 of 333
Title: Design of a femtosecond electron diffractometer with adjustable gaps
Author(s): Luo, D (Luo Duan); Hui, DD (Hui Dan-Dan); Wen, WL (Wen Wen-Long); Li, LL (Li Li-Li); Xin, LW (Xin Li-Wei); Zhong, ZY (Zhong Zi-Yuan); Ji, C (Ji Chao); Chen, P (Chen Ping); He, K (He Kai); Wang, X (Wang Xing); Tian, JS (Tian Jin-Shou)
Source: ACTA PHYSICA SINICA  Volume: 69  Issue: 5  Article Number: 052901  DOI: 10.7498/aps.69.20191157  Published: MAR 5 2020  
Abstract: One of the grand challenges in ultrafast science is real-time visualization of the microscopic structural evolution on atomic time and length scales. A promising pump-probe technique using a femtosecond laser pulse to initiate the ultrafast dynamics and another ultrashort electron pulse to probe the resulting changes has been developed and widely used to study ultrafast structural dynamics in chemical reactions, phase transitions, charge density waves, and even biological functions. In the past three decades, a number of different ultrafast electron guns have been developed to generate ultashort electron sources, mainly including hybrid electron gun with radio-frequency (RF) cavities for compressing the pulse broadening, relativistic electron gun for suppressing the coulomb interaction, single-electron pulses without space charge effect and compact direct current (DC) electron gun for minimizing the electron propagation distance. At present, these developments with different final electron energy and available total charge have improved the time response of ultrafast electron diffraction (UED) setups to a new frontier approaching to 100 fs regime. Although enormous efforts have been made, the superior capabilities and potentials of ultrafast electron diffraction (UED) are still hindered by space-charge induced pulse broadening. Besides, the penetration depth of electrons increases with the electron energy, while the scattering probability of electrons has the opposite consequence. Thus, in addition to the temporal resolution enhancement, it is also important that the electron energy should be tunable in a wide range to meet the requirements for samples with different thickness. Here in this work, we design a novel ultra-compact electron gun which combines a well-designed cathode profile, thereby providing a uniform field and a movable anode configuration to achieve a temporal resolution on the order of 100 fs over an accelerating voltage range from 10 kV to 125 kV. By optimizing the design of the high-voltage electrode profile, the field enhancement factor on the axis and along the cathode surface are both less than similar to 4% at different cathode-anode spacings, and thus the maximum on-axis field strength of similar to 10 MV/m is achieved under various accelerating voltages. This effectively suppresses the space charge broadening effect of the electron pulse. Furthermore, the anode aperture is designed as a stepped hole in which the dense sample grid can be placed, and the sample under study is directly supported by the grid and located at the anode, which reduces the cathode-to-sample distance, thus minimizing the electron pulse broadening from the cathode to sample. Moreover, the defocusing effect caused by the anode hole on the electron beam can be effectively reduced, therefore improving the lateral focusing performance of the electron beam.
Accession Number: WOS:000527802300002
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Luo, Duan    0000-0001-5926-9870 
ISSN: 1000-3290

Record 6 of 333
Title: High power, tunable, ultra-narrowband Yb-doped superfluorescent fiber source operating at wavelength less than 1055 nm with 20 nm tuning range
Author(s): Ju, P (Ju, Pei); Fan, WH (Fan, Wenhui); Zhao, BY (Zhao, Baoyin); Gao, W (Gao, Wei); Zhang, TY (Zhang, Tongyi); Li, G (Li, Gang); Gao, Q (Gao, Qi); Li, Z (Li, Zhe)
Source: INFRARED PHYSICS & TECHNOLOGY  Volume: 111  Article Number: 103530  DOI: 10.1016/j.infrared.2020.103530  Published: DEC 2020  
Abstract: Tunable, narrowband superfluorescent fiber sources (SFSs) are significantly important for spectral combination. Here, we propose a high power, tunable, ultra-narrowband Yb-doped SFS operating at wavelength less than 1055 nm with 20 nm tuning range. The system is composed of a broadband SFS, a home-mode space-to-fiber tunable spectral filter, and a three-stage amplifier chain. In order to achieve three typical characteristics, namely, operating in the shorter wavelength region (SWR) with wide spectrum, tunable and narrowband, and high-power output, the performance of the system is investigated and optimized based on the rate equations with temperature, grating monochromator and the coupling theory of Gaussian beam between fibers. Theoretical investigation indicates that a broadband SFS operating in the SWR with wide spectrum can be achieved by controlling temperature within a certain range. Moreover, by optimizing space-to-fiber tunable spectral filter, the tunable, ultra-narrowband SFS with linewidth of 0.088 nm can be obtained. In addition, the seed laser with signal to noise ratio (SNR) of more than 30 dB and the appropriate length of active fiber can gain better amplification performance from the main amplifier. Based on these optimized parameters, a high power, tunable, ultra-narrowband Yb-doped SFS has been built experimentally. The output power of narrowband SFS operating in tunable range from 1035 nm to 1055 nm exceeds 300 W with M-2 factor of 1.47, and the measured full width at half maximum and SNR of which are less than 0.1 nm and beyond 30 dB, respectively. This work extends the spectral region and capacity of narrowband SFSs, and will be useful for further power scaling of spectral beam combination.Y
Accession Number: WOS:000599507400005
ISSN: 1350-4495
eISSN: 1879-0275

Record 7 of 333
Title: Effect of different welding energy on microstructure and toughness of HAZ of low carbon bainitic steel
Author(s): Wang, H (Wang, Hong); Yang, L (Yang, Liang)
Source: INTERNATIONAL JOURNAL OF MODERN PHYSICS B  Volume: 34  Issue: 32  Article Number: 2050319  DOI: 10.1142/S0217979220503191  Published: DEC 30 2020  
Abstract: Low carbon bainitic steel (LCBS) with excellent combined properties is the first choice for materials of pipeline transiting geological disaster. However, welding will worsen its toughness. In this paper, three kinds of welding heat input were designed to study the relationship between the toughness and microstructure in the coarse grain zone of welding heat affect zone (CGHAZ) of LCBS. The evolution characteristics of the microstructure of LCBS and the CGHAZ, and impact fracture were investigated by optical microscopy (OM), scanning electron microscopy (SEM). The results indicated that microstructure of LCBS consists mainly of bainite ferrite (BF) and granular bainite (GB). Heat input for 22 kJ/cm, the original austenite grains become coarsening, the microstructure is a small amount of quasi polygonal ferrite (QF) and polygonal ferrite (PF), which exhibits low Charpy impact toughness. However, for heat input of 19 kJ/cm, the degree of grain coarsening is small and distribution of martensite-austenite (M-A) constituents is the chain. The statistics of image software show that with the increase of heat input (16-22 kJ/cm), the average grain size of original austenite is basically the same (25 um), which is mainly due to Nb solute drag restraint the growth of austenite grain.
Accession Number: WOS:000603659400015
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Wang, Hong    0000-0002-4699-9687 
ISSN: 0217-9792
eISSN: 1793-6578

Record 8 of 333
Title: Incoherent, non-invasive and non-scanning superoscillation-based microscope for super-resolution imaging
Author(s): Xie, QK (Xie, Qingkun); Jiang, YR (Jiang, Yanru); Liang, J (Liang, Jian); Qu, ES (Qu, Enshi); Ren, LY (Ren, Liyong)
Source: OPTICS COMMUNICATIONS  Volume: 463  Article Number: 125445  DOI: 10.1016/j.optcom.2020.125445  Published: MAY 15 2020  
Abstract: The superoscillation phenomenon, since it was first observed in the time variation of quantum systems, has become a research hotspot in optics. Recently, it has been vividly presented that one could achieve far field super-resolution imaging using a superoscillation lens instead of a conventional lens. Notwithstanding, confined by the coherent illumination and the complex scanning imaging mechanism, those systems have serious drawbacks in large field super-resolution imaging, such as the off-axis deformation, low imaging speed and strong sidelobe noise. In this paper, we report an incoherent, non-invasive and no-scanning superoscillation based microscope with a small numerical aperture, which, in principle, could effectively alleviate those limitations. We verify that, by installing a superoscillation element behind an imaging lens, a sub-diffraction point spread function with strongly suppressed sidelobes can be obtained. The experimental results of complex targets imaging demonstrate its feasibility and effectiveness in far field non-scanning imaging, where targets with detailed structures smaller than 71% of the Rayleigh Criterion are well distinguished.
Accession Number: WOS:000520479100023
ISSN: 0030-4018
eISSN: 1873-0310

Record 9 of 333
Title: Measurement of moisture content in lubricating oils of high-speed rail gearbox by Vis-NIR spectroscopy
Author(s): Liu, CY (Liu, Chenyang); Tang, XJ (Tang, Xingjia); Yu, T (Yu, Tao); Wang, TS (Wang, Taisheng); Lu, ZW (Lu, Zhenwu); Yu, WX (Yu, Weixing)
Source: OPTIK  Volume: 224  Article Number: 165694  DOI: 10.1016/j.ijleo.2020.165694  Published: DEC 2020  
Abstract: The moisture content in lubricating oil is one of the most important factors to reflect the health and effectiveness of it, thus to monitor the moisture content in lubricating oil in real time is crucial for high speed rail. In this paper, we developed a compact moisture-content monitoring system based on the visible-near-infrared (Vis-NIR) spectroscopy technology, which was shown to be able to determine the moisture content in lubricating oil in a fast, simple and accurate way. In this system, a reflection mode optical probe was developed for sending and receiving optical signals through the viewport of gear box. By employing the reflection optical probe, one can measure the spectrum of the lubricating oil in a fast way by simply putting the probe on viewport of gear box, and therefore has the potential to realize the real-time monitoring of the status of the lubricating oil. In order to verify the feasibility of the system, both reflection and transmission spectral of lubricating oil were taken. Partial least square regression (PLS) and back propagation neural network (BPNN) algorithms were used to establish the processing model. Modelling results show a good agreement in between two different probing modes. As a result, the effectiveness and reliability of the system have been proved, which provides a simple yet accurate method for real time monitoring the healthy status of the lubricating oil for the safe operation of the high-speed rail.
Accession Number: WOS:000596850700011
ISSN: 0030-4026
eISSN: 1618-1336

Record 10 of 333
Title: A pedestrian extraction algorithm based on single infrared image
Author(s): Zhou, DM (Zhou, Dongmei); Qiu, S (Qiu, Shi); Song, Y (Song, Yang); Xia, KJ (Xia, Kaijian)
Source: INFRARED PHYSICS & TECHNOLOGY  Volume: 105  Article Number: 103236  DOI: 10.1016/j.infrared.2020.103236  Published: MAR 2020  
Abstract: Infrared image can show the state of objects at night, which is an important way to obtain the information of objects at night. To solve the extraction of pedestrians completely from single infrared image, we analyze the features of infrared image and propose a pedestrian extraction algorithm based on single infrared image. Firstly, neighborhood and multi-projection models are constructed to locate suspected pedestrian areas. Then, the head in the infrared imaging centripetally is used to build the template. Finally, the weighted fusion of global template and head template is used to extract pedestrians. Experiments show that the algorithm proposed in this paper can extract pedestrians in various motion modes under complex conditions, and has strong robustness.
Accession Number: WOS:000526110800080
ISSN: 1350-4495
eISSN: 1879-0275

Record 11 of 333
Title: Neural-Adaptive Finite-Time Formation Tracking Control of Multiple Nonholonomic Agents With a Time-Varying Target
Author(s): Zhou, KB (Zhou, Kai-Bo); Wu, XK (Wu, Xiao-Kang); Ge, MF (Ge, Ming-Feng); Liang, CD (Liang, Chang-Duo); Hu, BL (Hu, Bing-Liang)
Source: IEEE ACCESS  Volume: 8  Pages: 62943-62953  DOI: 10.1109/ACCESS.2020.2980894  Published: 2020  
Abstract: This paper investigates the leader-following formation tracking problem (FTP) for multiple nonholonomic agent systems (MNASs) in the presence of external disturbances and parametric uncertainties, where both the kinematics and dynamics of the agents are taken into consideration. A novel finite-time distributed controller-estimator algorithm (DCEA) is designed to handle such a challenging problem. Based on Lyapunov stability method, the sufficient conditions for finite-time stability of the closed-loop system are derived. Finally, the simulation results are presented to demonstrate the effectiveness and the robustness of the proposed DCEA.
Accession Number: WOS:000530832200029
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Liang, Chang-Duo  AAT-4579-2021  0000-0002-5354-5990 
ISSN: 2169-3536

Record 12 of 333
Title: Siamese Dilated Inception Hashing With Intra-Group Correlation Enhancement for Image Retrieval
Author(s): Lu, XQ (Lu, Xiaoqiang); Chen, YX (Chen, Yaxiong); Li, XL (Li, Xuelong)
Source: IEEE TRANSACTIONS ON NEURAL NETWORKS AND LEARNING SYSTEMS  Volume: 31  Issue: 8  Pages: 3032-3046  DOI: 10.1109/TNNLS.2019.2935118  Published: AUG 2020  
Abstract: For large-scale image retrieval, hashing has been extensively explored in approximate nearest neighbor search methods due to its low storage and high computational efficiency. With the development of deep learning, deep hashing methods have made great progress in image retrieval. Most existing deep hashing methods cannot fully consider the intra-group correlation of hash codes, which leads to the correlation decrease problem of similar hash codes and ultimately affects the retrieval results. In this article, we propose an end-to-end siamese dilated inception hashing (SDIH) method that takes full advantage of multi-scale contextual information and category-level semantics to enhance the intra-group correlation of hash codes for hash codes learning. First, a novel siamese inception dilated network architecture is presented to generate hash codes with the intra-group correlation enhancement by exploiting multi-scale contextual information and category-level semantics simultaneously. Second, we propose a new regularized term, which can force the continuous values to approximate discrete values in hash codes learning and eventually reduces the discrepancy between the Hamming distance and the Euclidean distance. Finally, experimental results in five public data sets demonstrate that SDIH can outperform other state-of-the-art hashing algorithms.
Accession Number: WOS:000557365700029
PubMed ID: 31514159
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Li, Xuelong  ABF-3381-2020   
Chen, Yaxiong  AAR-7285-2020   
Chen, Yaxiong    0000-0002-2903-6723 
Lu, Xiaoqiang    0000-0002-7037-5188 
ISSN: 2162-237X
eISSN: 2162-2388

Record 13 of 333
Title: Gated and Axis-Concentrated Localization Network for Remote Sensing Object Detection
Author(s): Lu, XQ (Lu, Xiaoqiang); Zhang, YL (Zhang, Yuanlin); Yuan, Y (Yuan, Yuan); Feng, YC (Feng, Yachuang)
Source: IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING  Volume: 58  Issue: 1  Pages: 179-192  DOI: 10.1109/TGRS.2019.2935177  Published: JAN 2020  
Abstract: In the multicategory object detection task of high-resolution remote sensing images, small objects are always difficult to detect. This happens because the influence of location deviation on small object detection is greater than on large object detection. The reason is that, with the same intersection decrease between a predicted box and a true box, Intersection over Union (IoU) of small objects drops more than those of large objects. In order to address this challenge, we propose a new localization model to improve the location accuracy of small objects. This model is composed of two parts. First, a global feature gating process is proposed to implement a channel attention mechanism on local feature learning. This process takes full advantages of global features' abundant semantics and local features' spatial details. In this case, more effective information is selected for small object detection. Second, an axis-concentrated prediction (ACP) process is adopted to project convolutional feature maps into different spatial directions, so as to avoid interference between coordinate axes and improve the location accuracy. Then, coordinate prediction is implemented with a regression layer using the learned object representation. In our experiments, we explore the relationship between the detection accuracy and the object scale, and the results show that the performance improvements of small objects are distinct using our method. Compared with the classical deep learning detection models, the proposed gated axis-concentrated localization network (GACL Net) has the characteristic of focusing on small objects.
Accession Number: WOS:000507307800013
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Yuan, Yuan  ABB-2379-2020   
Zhang, Yuanlin  AAO-7260-2020  0000-0003-0960-3636 
Lu, Xiaoqiang    0000-0002-7037-5188 
ISSN: 0196-2892
eISSN: 1558-0644

Record 14 of 333
Title: Prediction of End-Of-Season Tuber Yield and Tuber Set in Potatoes Using In-Season UAV-Based Hyperspectral Imagery and Machine Learning
Author(s): Sun, C (Sun, Chen); Feng, LW (Feng, Luwei); Zhang, Z (Zhang, Zhou); Ma, YC (Ma, Yuchi); Crosby, T (Crosby, Trevor); Naber, M (Naber, Mack); Wang, Y (Wang, Yi)
Source: SENSORS  Volume: 20  Issue: 18  Article Number: 5293  DOI: 10.3390/s20185293  Published: SEP 2020  
Abstract: Potato is the largest non-cereal food crop in the world. Timely estimation of end-of-season tuber production using in-season information can inform sustainable agricultural management decisions that increase productivity while reducing impacts on the environment. Recently, unmanned aerial vehicles (UAVs) have become increasingly popular in precision agriculture due to their flexibility in data acquisition and improved spatial and spectral resolutions. In addition, compared with natural color and multispectral imagery, hyperspectral data can provide higher spectral fidelity which is important for modelling crop traits. In this study, we conducted end-of-season potato tuber yield and tuber set predictions using in-season UAV-based hyperspectral images and machine learning. Specifically, six mainstream machine learning models, i.e., ordinary least square (OLS), ridge regression, partial least square regression (PLSR), support vector regression (SVR), random forest (RF), and adaptive boosting (AdaBoost), were developed and compared across potato research plots with different irrigation rates at the University of Wisconsin Hancock Agricultural Research Station. Our results showed that the tuber set could be better predicted than the tuber yield, and using the multi-temporal hyperspectral data improved the model performance. Ridge achieved the best performance for predicting tuber yield (R-2= 0.63) while Ridge and PLSR had similar performance for predicting tuber set (R-2= 0.69). Our study demonstrated that hyperspectral imagery and machine learning have good potential to help potato growers efficiently manage their irrigation practices.
Accession Number: WOS:000580872300001
PubMed ID: 32947919
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Zhang, Zhou  F-7310-2017  0000-0001-7816-672X 
eISSN: 1424-8220

Record 15 of 333
Title: Design and Experimental Test of a Common-path Coherent-dispersion Spectrometer for Exoplanet Searches
Author(s): Wei, RY (Wei, Ruyi); Chen, SS (Chen, Shasha); Hu, BL (Hu, Bingliang); Yan, QQ (Yan, Qiangqiang); Wu, YH (Wu, Yinhua); Wang, PC (Wang, Pengchong)
Source: PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC  Volume: 132  Issue: 1007  Article Number: 015003  DOI: 10.1088/1538-3873/ab503a  Published: JAN 2020  
Abstract: A coherent-dispersion spectrometer (CODES) system using the radial velocity (RV) method for exoplanet searches is established in this paper. This spectrometer utilizes a new Sagnac interferometer with common-path and asymmetric designs. Compared with the traditional Michelson interferometer-based spectrometer for exoplanet detection, these designs markedly improve the stability of the optical path difference (OPD) to positional changes in optical elements or air density changes, reducing the need for active cavity stabilization. Furthermore, the asymmetric Sagnac design allows convenient separation of the two complementary outputs. In order to verify the feasibility of the CODES, an optical Doppler shift experiment is constructed in the laboratory. The RV signal was extracted by the phase shifts of the interference fringes produced by the spectrometer. The experimental results show that the obtained retrieved RV is 76.7 m s(-1), with an absolute error of 0.3 m s(-1) compared to simulated values. And the root mean square error (RMSE) and the standard deviation (STD) are 21.3 m s(-1) and 21.4 m s(-1), respectively. Error analyses show that the OPD change caused by the temperature variation is the main factor for the RMSE and STD.
Accession Number: WOS:000526842100002
ISSN: 0004-6280
eISSN: 1538-3873

Record 16 of 333
Title: Local Phase-Amplitude Joint Correction for Free Surface Velocity of Hopkinson Pressure Bar
Author(s): Yang, J (Yang, Jun); He, JH (He, Junhua); Zhang, DZ (Zhang, Dezhi); Xu, HB (Xu, Haibin); Shi, GK (Shi, Guokai); Zhang, M (Zhang, Min); Liu, WX (Liu, Wenxiang); Zhang, Y (Zhang, Yang)
Source: APPLIED SCIENCES-BASEL  Volume: 10  Issue: 15  Article Number: 5390  DOI: 10.3390/app10155390  Published: AUG 2020  
Abstract: Featured Application Reflected near-field blast pressure measurement. The Hopkinson pressure bar is widely used to measure the reflected pressure of blast waves over a short distance. However, dispersion effects will occur when the elastic stress waves propagate in the pressure bar due to lateral inertia, and there will be errors between the signals obtained from the sensors and the actual loading. For the free surface velocity measured in our system, we developed a local phase-amplitude joint correction method to convert the measured velocity into the average reflected pressure of a shock wave at the impact end of the bar, considering factors such as propagation modes of the elastic wave, the frequency components' time of arrival, velocity variation over the bar axis, and the stress-velocity relationship. Firstly, the Pochhammer-Chree frequency equation is calculated numerically, and the first to fourth orders of phase velocity, group velocity, normalized frequency, and propagation time curves of elastic wave propagation in 35CrMnSiA steel are obtained. Secondly, the phase and amplitude correction formulas for calculating average reflected pressure from center velocity are derived based on the propagation mode of the axial elastic wave in the pressure bar by analyzing the time-frequency combined spectrum obtained by short-time Fourier transform. Thirdly, a local phase-amplitude joint correction algorithm based on propagation mode is proposed in detail. The experimental tests and data analyses are carried out for eight sets of pressure bar. The results show that this method can identify the propagation mode of elastic waves in the bar intuitively and clearly. The first three orders of propagation modes are stimulated in the bar 04, while only the first order of propagation is stimulated in the other eight bars. The local phase-amplitude joint correction algorithm can avoid correcting the component of the non-axial elastic wave. The rising edge of the average stress curve on the impact surface of bar 01 and bar 04 is corrected from 4.13 mu s and 4.09 mu s to 2.70 mu s, respectively.
Accession Number: WOS:000559084500001
eISSN: 2076-3417

Record 17 of 333
Title: Optimization thermal design method for space cameras based on thermo-optical analysis and Taguchi method
Author(s): Zhang, GP (Zhang, Gaopeng); Zhao, H (Zhao, Hong); Chen, YH (Chen, Yaohong); Zhang, GD (Zhang, Guangdong); Zhang, Z (Zhang, Zhi); Peng, JW (Peng, Jianwei); Zhao, ZX (Zhao, Zixin); Yan, AQ (Yan, Aqi)
Source: OPTICAL ENGINEERING  Volume: 59  Issue: 7  Article Number: 075101  DOI: 10.1117/1.OE.59.7.075101  Published: JUL 2020  
Abstract: Thermal design is highly related to the performance of space cameras as temperature changes cause thermal displacements of the cameras' optical and mechanical systems, consequently affecting imaging quality. However, most existing thermal design methods for space cameras focus on several thermal design parameters without a comprehensive and quantitative analysis. Therefore, we proposed an optimization thermal design method for space cameras based on thermo-optical analysis and the Taguchi method. We first established the thermal balance equations of space cameras, and by analyzing the thermal design parameters in the equations, we identified the key parameters that affect the temperature field, thermal displacements, and imaging quality of the camera. Furthermore, we evaluated the influence of each thermal design parameter on imaging quality based on the integrated thermo-optical analysis. Thereafter, we applied the Taguchi method to quantitatively calculate the effect of each thermal design parameter on imaging quality. Finally, we implemented an optimal thermal control scheme for space cameras based on the results of the Taguchi method. The experimental results demonstrated that the proposed method is reliable and efficient and would be beneficial to researchers working on the thermal design of optical instruments. (C) 2020 Society of Photo-Optical Instrumentation Engineers (SPIE)
Accession Number: WOS:000590240300019
ISSN: 0091-3286
eISSN: 1560-2303

Record 18 of 333
Title: Hyperspectral deep convolution anomaly detection based on weight adjustment strategy
Author(s): Chong, D (Chong, Dan); Hu, BL (Hu, Bingliang); Gao, XH (Gao, Xiaohui); Gao, H (Gao, Hao); Xia, P (Xia, Pu); Wu, YH (Wu, Yinhua)
Source: APPLIED OPTICS  Volume: 59  Issue: 31  Pages: 9633-9642  DOI: 10.1364/AO.400563  Published: NOV 1 2020  
Abstract: Hyperspectral anomaly detection has garnered much research in recent years due to the excellent detection ability of hyperspectral remote sensing in agriculture, forestry, geological surveys, environmental monitoring, and battlefield target detection. The traditional anomaly detection method ignores the non-linearity and complexity of the hyperspectral image (HSI), while making use of the effectiveness of spatial information rarely. Besides, the anomalous pixels and the background are mixed, which causes a higher false alarm rate in the detection result. In this paper, a hyperspectral deep net-based anomaly detector using weight adjustment strategy (WAHyperDNet) is proposed to circumvent the above issues. We leverage three-dimensional convolution instead of the two-dimensional convolution to get a better way of handling high-dimensional data. In this study, the determinative spectrum-spatial features are extracted across the correlation between HSI pixels. Moreover, feature weights in the method are automatically generated based on absolute distance and the spectral similarity angle to describe the differences between the background pixels and the pixels to be tested. Experimental results on five public datasets show that the proposed approach outperforms the state-of-the-art baselines in both effectiveness and efficiency. (C) 2020 Optical Society of America
Accession Number: WOS:000583718000001
PubMed ID: 33175802
ISSN: 1559-128X
eISSN: 2155-3165

Record 19 of 333
Title: Hybrid multifocal structured illumination microscopy with enhanced lateral resolution and axial localization capability
Author(s): Wang, ZJ (Wang, Zhaojun); Cai, YN (Cai, Yanan); Qian, J (Qian, Jia); Zhao, TY (Zhao, Tianyu); Liang, YS (Liang, Yansheng); Dan, D (Dan, Dan); Lei, M (Lei, Ming); Yao, BL (Yao, Baoli)
Source: BIOMEDICAL OPTICS EXPRESS  Volume: 11  Issue: 6  Pages: 3058-3070  DOI: 10.1364/BOE.391024  Published: JUN 1 2020  
Abstract: Super-resolution (SR) fluorescence microscopy that breaks through the diffraction barrier has drawn great interest in biomedical research. However, obtaining a high precision three-dimensional distribution of the specimen in a short time still remains a challenging task for existing techniques. In this paper, we propose a super-resolution fluorescence microscopy with axial localization capability by combining multifocal structured illumination microscopy with a hybrid detection PSF composed of a Gaussian PSF and a double-helix PSF. A modified reconstruction scheme is presented to accommodate the new hybrid PSF. This method can not only recover the lateral super-resolution image of the specimen but also retain the specimen's depth map within a range of 600 nm with an axial localization precision of 20.8 nm. The performance of this approach is verified by testing fluorescent beads and tubulin in 293-cells. The developed microscope is well suited for observing the precise 3D distribution of thin specimens. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Accession Number: WOS:000548459300002
PubMed ID: 32637241
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Yao, Baoli  AAB-4606-2021   
Liang, Yansheng    0000-0002-3561-1317 
ISSN: 2156-7085

Record 20 of 333
Title: Moving target extraction and background reconstruction algorithm
Author(s): Qiu, S (Qiu, Shi); Li, XM (Li, Xuemei)
Source: JOURNAL OF AMBIENT INTELLIGENCE AND HUMANIZED COMPUTING  DOI: 10.1007/s12652-020-02619-2  Early Access Date: OCT 2020   
Abstract: It is difficult for the computer to distinguish the target from the background due to the long-time static of the target after moving. A new moving target detection and background reconstruction algorithm is proposed and is applied into the RGB video for the first time. Firstly, the proposed algorithm builds a model from the time dimension to extract the changed region. Then, it combines with the space dimension information to completely extract the moving target. The spatiotemporal correlation model is established to realize the construction of pure background. The experimental results show that the proposed algorithm can effectively reconstruct the background and the recognition rate of moving target is high.
Accession Number: WOS:000582098500001
ISSN: 1868-5137
eISSN: 1868-5145

Record 21 of 333
Title: Thermal design for the package of high-power single-emitter laser diodes
Author(s): Wu, DH (Wu, Di-Hai); Zah, CE (Zah, Chung-En); Liu, XS (Liu, Xingsheng)
Source: OPTICS AND LASER TECHNOLOGY  Volume: 129  Article Number: 106266  DOI: 10.1016/j.optlastec.2020.106266  Published: SEP 2020  
Abstract: An analytical three-dimensional thermal model is employed to perform the thermal design for the package of high-power single-emitter laser diodes. Thermal design curves for the heat sink and submount are presented in detail, for laser diodes subjected to several convective heat transfer conditions on the bottom of the heat sink. An effective heat spreading angle is proposed to characterize thermal design for the heat sink. A differential heat spreading angle is proposed to clearly manifest heat flow in the packages. Full width and length at 90% energy are introduced to reveal the requirement of submount width and length, respectively. The impact of coefficient of thermal expansion (CTE)-matched sandwiched submount on total heat dissipation is studied. Special discussion is presented for a commercial F-Mount laser diode, and it is found that current heat sink design leads to a 27.4% increase in thermal resistance relative to a free lateral diffusion package.
Accession Number: WOS:000537415900008
ISSN: 0030-3992
eISSN: 1879-2545

Record 22 of 333
Title: Optimized all-fiber laser Doppler velocimeter with large depth of field
Author(s): Hao, GY (Hao, GeYang); Cui, Y (Cui, Ying); Yang, YC (Yang, Yucheng); Iv, XP (Iv, Xiaopeng); Wu, GJ (Wu, Guojun)
Source: OPTICAL FIBER TECHNOLOGY  Volume: 60  Article Number: 102333  DOI: 10.1016/j.yofte.2020.102333  Published: DEC 2020  
Abstract: Due to the low spatial coupling efficiency of optical fiber and large energy loss, the depth of field in the all-fiber laser Doppler velocimeter is short, and the focus needs to be adjusted before measurement, so it is impossible to continuously measure the velocity of object moving along the optical axis. To solve this problem, an all-fiber Doppler velocimeter based on the Mach-Zehnder interferometer structure is designed, also, in the optical antenna section, C-lens is used to change the divergence angle of the light coming out of the optical fiber. The optimized design achieves the detection with large depth of field. The experiment is designed to verify the intensity of the echo signal, signal-to-noise ratio (SNR) and the speed accuracy of the velocimeter taken in different depths of field. The test results show that the depth of field in this system is superior to 25 m. The SNR is stable around 16 dB with small fluctuation in the range of depth of field, and the speed accuracy is better than +/- 0.1 m/s.
Accession Number: WOS:000598713600007
ISSN: 1068-5200
eISSN: 1095-9912

Record 23 of 333
Title: Color full stokes polarization fringe projection 3D imaging
Author(s): Liang, J (Liang, Jian); Tian, XB (Tian, Xiaobo); Tu, XZ (Tu, Xingzhou); Spires, O (Spires, Oliver); Brock, N (Brock, Neal); Wang, DD (Wang, Daodang); Wu, H (Wu, Heng); Ren, LY (Ren, Liyong); Yao, BL (Yao, Baoli); Pau, S (Pau, Stanley); Liang, RG (Liang, Rongguang)
Source: OPTICS AND LASERS IN ENGINEERING  Volume: 130  Article Number: 106088  DOI: 10.1016/j.optlaseng.2020.106088  Published: JUL 2020  
Abstract: In this paper, we propose and demonstrate a new 3D imaging technique which can simultaneously provide surface shape, color, and polarization information of an object. The system employs a custom color full Stokes polarization camera and a digital color fringe projector. The color and polarization data provide additional surface details not possible using conventional fringe projection 3D imaging techniques, but important for target identification. We demonstrate that, for an object with weak spectral dependent polarization properties, it is possible to obtain surface shape, intensity, and polarization information in a snapshot, dramatically improving the imaging speed.
Accession Number: WOS:000532670100005
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Yao, Baoli  AAB-4606-2021   
ISSN: 0143-8166
eISSN: 1873-0302

Record 24 of 333
Title: Femtosecond laser-induced non-centrosymmetric surface microstructures on bulk metallic glass for unidirectional droplet micro-displacement
Author(s): Li, C (Li, Chen); Yang, LJ (Yang, Lijun); Ren, XZ (Ren, Xuezhuang); Yang, Y (Yang, Yong); Cheng, GH (Cheng, Guanghua)
Source: JOURNAL OF PHYSICS D-APPLIED PHYSICS  Volume: 53  Issue: 10  Article Number: 105305  DOI: 10.1088/1361-6463/ab5df7  Published: MAR 6 2020  
Abstract: Unidirectional droplet motion without energy input has attracted considerable attention in various potential applications. We report on the fabrication of unconventional laser-induced periodic surface structures (LIPSS) for unidirectional droplet micro-displacement by a femtosecond laser at a large incident angle. In order to overcome the mechanical durability of the existing soft materials such as PDMS for controlling the droplet, Zr-based bulk metallic glass (Zr-BMG) is used to fabricate the typical non-centrosymmetric unconventional LIPSS, which include micro-sized elliptical arc-shaped structures and nano-ripples with the central spatial periodicity of 400 nm. The spots and the grating of unconventional LIPSS on Zr-BMG are fabricated to construct the functional surface structures by femtosecond laser irradiation. The unidirectional micro-displacement of water droplet on Zr-BMG was achieved using functional surface structures. For better understanding the fabrication of unconventional LIPSS, the underlying formation mechanism was revealed by numerical simulations. This work gives a fast, precise and low-cost method to fabricate the non-centrosymmetric surface micro/nano-structures on metal materials for unidirectional droplet motion in microfluidics.
Accession Number: WOS:000505057200001
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
LI, Chen    0000-0001-9442-1014 
ISSN: 0022-3727
eISSN: 1361-6463

Record 25 of 333
Title: Theoretical and experimental investigation of secondary electron emission characteristics of MgO coating produced by atomic layer deposition
Author(s): Guo, JJ (Guo, Junjiang); Wang, D (Wang, Dan); Wen, KL (Wen, Kaile); Xu, YT (Xu, Yantao); Zhu, XP (Zhu, Xiangping); Liu, LT (Liu, Lutao); Cao, WW (Cao, Weiwei); Si, JH (Si, Jinhai); Lu, M (Lu, Min); Guo, HT (Guo, Haitao)
Source: CERAMICS INTERNATIONAL  Volume: 46  Issue: 6  Pages: 8352-8357  DOI: 10.1016/j.ceramint.2019.12.067  Published: APR 15 2020  
Abstract: Atomic layer deposition (ALD) is utilized to prepare thin MgO coatings 1-50 nm on Si substrate. In addition, secondary electron emission (SEE) coefficient of MgO/Si double-layered structure is evaluated as a function of coating thickness and primary electron (PE) energy. After neutralizing the surface of test specimen, we have accurately analyzed the relationship between secondary electron yield (SEY) of MgO coating and PE energy. Meanwhile, SEE characteristics of MgO/Si double-layered structure have been systematically analyzed. A maximum SEY value of 6.15 has been achieved at coating thickness of 30 nm and PE energy of 550 eV. Furthermore, theoretical model is established by using Dionne's SEE model to analyze experimentally measured SEY data, demonstrating consistency between experimentally measured and theoretically calculated results. This work demonstrates that SEE level of MgO coating can be optimized by tuning coating thickness and presents novel insights into SEE characteristics of composite materials. Those results can serve as a baseline for further design and fabrication of a wide array of electronic devices.
Accession Number: WOS:000519661800156
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Dan, Wang    0000-0002-6337-7177 
ISSN: 0272-8842
eISSN: 1873-3956

Record 1 of 333
Title: Study of size variations in the focal spot of a Wolter-1 mirror under point-source condition
Author(s): Li, LS (Li, Linsen); Zhang, CM (Zhang, Chunmin); Qiang, PF (Qiang, Pengfei); Sheng, LZ (Sheng, Lizhi); Liu, Z (Liu, Zhe); Zhou, XH (Zhou, Xiaohong); Zhao, BS (Zhao, Baosheng)
Source: OPTIK  Volume: 201  Article Number: 163446  DOI: 10.1016/j.ijleo.2019.163446  Published: JAN 2020  
Abstract: In this study, a geometric model of Wolter-I X-ray focusing mirror was established, and a set of equations were derived for determining the parameters of glass substrate focusing mirror. In order to study the focal spot diffusion at the theoretical focal point under the condition of point light source. A formula for calculating the focal spot size of the single-layer focusing mirror at the theoretical focal length under point-source incident light was derived through theoretical analysis. A set of Wolter-I X-ray focusing mirror were fabricated through a slumping process using Schott D263 T glass,which is designed based on the derived equations. Ray tracing software was used to simulate the size variations of focal spot under parallel incident light and point-source incident light. A test system was constructed, and experiments were conducted to verify the validity of the calculation formula and the results of the simulation analysis. The test results showed that the theoretical results are in good agreement with the experimental results.
Accession Number: WOS:000506318200046
ISSN: 0030-4026
eISSN: 1618-1336

Record 2 of 333
Title: Study on fabrication, spectrum and torsion sensing characteristics of microtapered long-period fiber gratings
Author(s): Wang, BC (Wang, Bingchuan); Ren, LY (Ren, Liyong); Kong, XD (Kong, Xudong); Xu, YP (Xu, Yiping); Ren, KL (Ren, Kaili); Yang, WX (Yang, Wenxing); Cheng, SB (Cheng, Shubo); Chen, F (Chen, Fang); Song, F (Song, Feng)
Source: OPTIK  Volume: 207  Article Number: 164445  DOI: 10.1016/j.ijleo.2020.164445  Published: APR 2020  
Abstract: Based on the photoelastic effect, a microtapered long-period fiber grating (MLPFG) is fabricated by using a CO2 fusion splicer, which has high repeatability and small loss. By analyzing the spectrum of the grating, it is easy to know that the grating has a significant absorption effect only for light with a specific wavelength (such as lambda approximate to 1569 nm). In the process of fabrication, it is found that with the increase of refractive index modulation, the extinction ratio of the spectrum increases gradually, and the resonant dip drifts toward the long wavelength. In addition, it is found that the twist direction and the torsion angle of the grating can be judged by observing the change of the spectrum in the experiment of exploring the sensing of torsion. When the grating is twisted clockwise, wavelength and extinction ratio of the resonant dip decrease gradually; when the grating is twisted counterclockwise, the wavelength increases gradually, but the extinction ratio increases first and then decreases. The torsion sensitivity is 0.10 nm.mm.rad(-1), which is about two times higher than that of CLPGs fabricated from photonic crystal fibers and about three times higher than that of conventional LPFGs. By utilizing these characteristics of MLPFG, it can be widely used in filters and sensors.
Accession Number: WOS:000523186200148
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Ren, Liyong  F-5518-2014  0000-0002-7547-7511 
ISSN: 0030-4026
eISSN: 1618-1336

Record 3 of 333
Title: Real-time infrared image detail enhancement based on fast guided image filter and plateau equalization
Author(s): Chen, YH (Chen, Yaohong); Kang, JU (Kang, Jin U.); Zhang, GP (Zhang, Gaopeng); Cao, JZ (Cao, Jianzhong); Xie, QS (Xie, Qingsheng); Kwan, C (Kwan, Chiman)
Source: APPLIED OPTICS  Volume: 59  Issue: 21  Pages: 6407-6416  DOI: 10.1364/AO.396417  Published: JUL 20 2020  
Abstract: Image detail enhancement is critical to the performance of infrared imaging systems because the original images generally suffer from low contrast and a low signal-to-noise ratio. Although conventional decomposition-based methods have advantages in enhancing image details, they also have clear disadvantages, which include intensive computations, over-enhanced noise, and gradient reversal artifacts. In this paper, we propose to accelerate enhancement processing by using a fast guided filter and plateau equalization. Our method consists of image decomposition, base and detail layers processing, and projection of the enhanced image to an 8-bit dynamic range. Experimental results demonstrated that our proposed method achieves a good balance among detail enhancement performance, noise and gradient reversal artifacts suppression, and computational cost, with a frame rate around 30 fps for 640 x 512 infrared images. (C) 2020 Optical Society of America
Accession Number: WOS:000571433700034
PubMed ID: 32749307
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Kwan, Chiman  N-7757-2015  0000-0002-4341-0769 
ISSN: 1559-128X
eISSN: 2155-3165

Record 4 of 333
Title: Molybdenum Disulfide Film Saturable Absorber Based on Sol-Gel Glass and Spin-Coating Used in High-Power Q-Switched Nd:YAG Laser
Author(s): Wang, J (Wang, Jiang); Chen, ZD (Chen, Zhendong); Wang, YG (Wang, Yonggang); Wang, TJ (Wang, Taijin); Liu, SC (Liu, Sicong); Chen, GH (Chen, Guanghua); Wang, YS (Wang, Yishan); Ren, W (Ren, Wei); Li, L (Li, Lu)
Source: ACS APPLIED MATERIALS & INTERFACES  Volume: 12  Issue: 8  Pages: 9404-9408  DOI: 10.1021/acsami.9b14494  Published: FEB 26 2020  
Abstract: In recent years, many different kinds of nonlinear optical 1 materials have been applied to passively Q-switched solid-state lasers. However, the average output powers of these lasers are typically limited to 1 W due to the low damage threshold of the materials. In this study, a molybdenum-disulfide-doped glass-composite absorber was synthesized using the sol gel method and spin-coating technique. The optical damage threshold of the absorber reached 3.17 J/cm(2). Saturation intensity, modulation depth, and nonsaturable loss are 9.35 MW/cm(2), 8.41%, and 9.14%, respectively. After inserting the absorber into a linear Nd:YAG laser cavity, the maximum average output power (3.22 W) and stable Qswitched laser pulses duration (132 ns) were obtained.
Accession Number: WOS:000517360000046
PubMed ID: 31983200
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Li, Lu  AAX-7723-2020   
Wang, Jang    0000-0002-3969-9459 
ISSN: 1944-8244
eISSN: 1944-8252

Record 5 of 333
Title: Restoration Method of Hadamard Coding Spectral Imager
Author(s): Tang, XJ (Tang Xingjia); Xu, ZB (Xu Zongben); Li, LB (Li Libo); Wang, S (Wang Shuang); Hu, BL (Hu Bingliang); Wang, F (Wang Feng)
Source: APPLIED SPECTROSCOPY  Volume: 74  Issue: 5  Pages: 583-596  DOI: 10.1177/0003702819900381  Published: MAY 2020  
Abstract: Hadamard coding spectral imaging technology is a computational spectral imaging technology, which modulates the target's spectral information and recovers the original spectrum by inverse transformation. Because it has the advantage of multichannel detection, it is being studied by more researchers. For the engineering realization of push-broom coding spectral imaging instrument, it will inevitably be subjected to push-broom error, template error and detection noise, the redundant sampling problem caused by detector. Therefore, three restoration methods are presented in this paper: firstly, the one is the least squares solution, the two is the zero-filling inverse solution by extending the coding matrix in the redundant coding state to a complete higher order Hadamard matrix, the three is sparse method. Secondly, the numerical and principle analysis shows that the inverse solution of zero-compensation has better robustness and is more suitable for engineering application; its conditional number, error expectation and covariance are better and more stable because it directly uses Hadamard matrix, which has good generalized orthogonality. Then, a real-time spectral reconstruction method is presented, which is based on inverse solution of zero-compensation. Finally, simulation analysis shows that spectral data could be destructed relative accuracy in the error condition; however, the effect of template noise and push error on reconstruction is much greater than that of detection error. Therefore, in addition to reducing the detection noise as much as possible, lower template noise and more accurate push controlling should be guaranteed specifically in engineering realization.
Accession Number: WOS:000532433100009
PubMed ID: 31880169
ISSN: 0003-7028
eISSN: 1943-3530

Record 6 of 333
Title: Spectral Clustering by Joint Spectral Embedding and Spectral Rotation
Author(s): Pang, YW (Pang, Yanwei); Xie, J (Xie, Jin); Nie, FP (Nie, Feiping); Li, XL (Li, Xuelong)
Source: IEEE TRANSACTIONS ON CYBERNETICS  Volume: 50  Issue: 1  Pages: 247-258  DOI: 10.1109/TCYB.2018.2868742  Published: JAN 2020  
Abstract: Spectral clustering is an important clustering method widely used for pattern recognition and image segmentation. Classical spectral clustering algorithms consist of two separate stages: 1) solving a relaxed continuous optimization problem to obtain a real matrix followed by 2) applying K-means or spectral rotation to round the real matrix (i.e., continuous clustering result) into a binary matrix called the cluster indicator matrix. Such a separate scheme is not guaranteed to achieve jointly optimal result because of the loss of useful information. To obtain a better clustering result, in this paper, we propose a joint model to simultaneously compute the optimal real matrix and binary matrix. The existing joint model adopts an orthonormal real matrix to approximate the orthogonal but nonorthonormal cluster indicator matrix. It is noted that only in a very special case (i.e., all clusters have the same number of samples), the cluster indicator matrix is an orthonormal matrix multiplied by a real number. The error of approximating a nonorthonormal matrix is inevitably large. To overcome the drawback, we propose replacing the nonorthonormal cluster indicator matrix with a scaled cluster indicator matrix which is an orthonormal matrix. Our method is capable of obtaining better performance because it is easy to minimize the difference between two orthonormal matrices. Experimental results on benchmark datasets demonstrate the effectiveness of the proposed method (called JSESR).
Accession Number: WOS:000511934000021
PubMed ID: 30295637
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Li, Xuelong  ABF-3381-2020   
Nie, Feiping    0000-0002-0871-6519 
Xie, Jin    0000-0001-6978-8834 
ISSN: 2168-2267
eISSN: 2168-2275

Record 7 of 333
Title: Improved genetic algorithm for intrinsic parameters estimation of on-orbit space cameras
Author(s): Zhang, GP (Zhang, Gaopeng); Zhao, H (Zhao, Hong); Zhang, GD (Zhang, Guangdong); Chen, YH (Chen, Yaohong)
Source: OPTICS COMMUNICATIONS  Volume: 475  Article Number: 126235  DOI: 10.1016/j.optcom.2020.126235  Published: NOV 15 2020  
Abstract: Computer vision plays a key role to measure the relative posture and position between the spacecrafts, especially in various important space tasks. As one of the essential steps for computer vision, camera calibration is important for obtaining precise three-dimensional contours of the space target. However, it is impossible to use the traditional calibration targets to calibrate the space camera in orbit. To solve this problem, in this paper, we attack the on-orbit space camera calibration problem by using two steps. First, we only use two images of the solar panel, which is a commonly used element of majority human-made spacecraft, to generate an approximate initial estimation of the camera intrinsic parameters. In order to improve the robustness and accuracy of our method, the second step optimizes the initial solution by using an improved genetic algorithm (IGA). Simulated and real experiments prove that the proposed method is accurate and flexible, and shows good robust performance. Therefore, our method has realistic significance for various space tasks.
Accession Number: WOS:000562377900015
ISSN: 0030-4018
eISSN: 1873-0310

Record 8 of 333
Title: All-dielectric metasurface with multi-function in the near-infrared band
Author(s): Zhang, XD (Zhang, Xiaodong); Kong, DP (Kong, Depeng); Liu, SJ (Liu, Sujuan); Wang, HY (Wang, Haiyan)
Source: JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION  Volume: 37  Issue: 11  Pages: 1731-1739  DOI: 10.1364/JOSAA.398245  Published: NOV 1 2020  
Abstract: This paper presents an approach to design the all-dielectric metasurface with multi-function in the near-infrared range of 1.5-1.6 mu m. Based on the geometric phase principle, the all-dielectric metasurface is composed of the Si nanopillar and the SiO2 substrate as an emitter unit distributed in a 21 x 21 array. Under the incidence of the circularly polarized light at 1550 nm, the metasurface works as a vortex-beam generator with high performance which generates the vortex beam with topological charges of +/- 1, and the mode purity of the vortex beam is 90.66%. Under the incidence of the linearly polarized light at 1550 nm, the metasurface also works as the azimuthally/radially polarized beam generator with high performance, and the purities of the azimuthally and the radially polarized beams are 92.52% and 91.02%, respectively. Moreover, the metasurface generates different output spots under the different incident lights which can be applied to optical encryption, and the metasurface with the phase gradient also can be used as the dual-channel encoder/decoder in optical communication. The simulated results are in good agreement with the theoretical derivation. The designed metasurface may become a potential candidate as a multi-function photon device in the integrated optical system in the future. (C) 2020 Optical Society of America
Accession Number: WOS:000583368500027
PubMed ID: 33175749
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
kong, de peng    0000-0003-3359-5517 
ISSN: 1084-7529
eISSN: 1520-8532

Record 9 of 333
Title: Nuclear miR-30b-5p suppresses TFEB-mediated lysosomal biogenesis and autophagy
Author(s): Guo, HJ (Guo, Huijie); Pu, M (Pu, Mei); Tai, YS (Tai, Yusi); Chen, YX (Chen, Yuxiang); Lu, HL (Lu, Henglei); Qiao, JW (Qiao, Junwen); Wang, GH (Wang, Guanghui); Chen, J (Chen, Jing); Qi, XM (Qi, Xinming); Huang, RM (Huang, Ruimin); Tao, ZT (Tao, Zhouteng); Ren, J (Ren, Jin)
Source: CELL DEATH AND DIFFERENTIATION  Volume: 28  Issue: 1  Pages: 320-336  DOI: 10.1038/s41418-020-0602-4  Early Access Date: AUG 2020   Published: JAN 2021  
Abstract: Lysosome is a crucial organelle in charge of degrading proteins and damaged organelles to maintain cellular homeostasis. Transcription factor EB (TFEB) is the master transcription factor regulating lysosomal biogenesis and autophagy. Under external stimuli such as starvation, dephosphorylated TFEB transports into the nucleus to specifically recognize and bind to the coordinated lysosomal expression and regulation (CLEAR) elements at the promotors of autophagy and lysosomal biogenesis-related genes. The function of TFEB in the nucleus is fine regulated but the molecular mechanism is not fully elucidated. In this study, we discovered that miR-30b-5p, a small RNA which is known to regulate a series of genes through posttranscriptional regulation in the cytoplasm, was translocated into the nucleus, bound to the CLEAR elements, suppressed the transcription of TFEB-dependent downstream genes, and further inhibited the lysosomal biogenesis and the autophagic flux; meanwhile, knocking out the endogenous miR-30b-5p by CRISPR/Cas9 technique significantly increased the TFEB-mediated transactivation, resulting in the increased expression of autophagy and lysosomal biogenesis-related genes. Overexpressing miR-30b-5p in mice livers showed a decrease in lysosomal biogenesis and autophagy. These in vitro and in vivo data indicate that miR-30b-5p may inhibit the TFEB-dependent transactivation by binding to the CLEAR elements in the nucleus to regulate the lysosomal biogenesis and autophagy. This novel mechanism of nuclear miRNA regulating gene transcription is conducive to further elucidating the roles of miRNAs in the lysosomal physiological functions and helps to understand the pathogenesis of abnormal autophagy-related diseases.
Accession Number: WOS:000556619400001
PubMed ID: 32764647
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Wang, Guanghui  U-3979-2017  0000-0001-8551-6468 
Huang, Ruimin    0000-0001-9369-0263 
ISSN: 1350-9047
eISSN: 1476-5403

Record 10 of 333
Title: Graphene Fabrication by Using Femtosecond Pulsed Laser and Its Application on Passively Q-Switched Solid-State Laser as Saturable Absorber
Author(s): Li, GY (Li, Guangying); Zhang, GD (Zhang, Guodong); Lou, R (Lou, Rui); Wang, YS (Wang, Yishan); Xie, XP (Xie, Xiaoping); Wang, J (Wang, Jiang); Wang, YG (Wang, Yonggang); Cheng, GH (Cheng, Guanghua)
Source: IEEE PHOTONICS JOURNAL  Volume: 12  Issue: 2  Article Number: 1501009  DOI: 10.1109/JPHOT.2020.2966217  Published: APR 2020  
Abstract: Here we report on the exfoliation of graphene by using femtosecond pulsed laser with the highly oriented pyrolytic graphite (HOPG) immersed in water. The size of the graphene flakes was demonstrated to be well regulated by controlling the peak-power density of the femtosecond laser irradiation on the HOPG. The transmission electron microscopy (TEM) and Raman spectroscopy were used to identify the morphology and crystalline phase of the graphene. As an application, the few-layers-graphene absorber with a modulation depth of 0.5% was used in a passive Q-switched Nd: YVO4 laser. A Q-switched nanosecond pulse train with the maximum pulse energy of 262.35 nJ and the narrowest pulse duration of 131.6 ns was obtained.
Accession Number: WOS:000520443600001
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Wang, Jang    0000-0002-3969-9459 
ISSN: 1943-0655
eISSN: 1943-0647

Record 11 of 333
Title: Sequential Evolution of Colored Copper Surface Irradiated by Defocused Femtosecond Laser
Author(s): Ding, KW (Ding, Kaiwen); Li, M (Li, Ming); Wang, C (Wang, Cong); Lin, N (Lin, Nai); Wang, HR (Wang, Haoran); Luo, Z (Luo, Zhi); Duan, JA (Duan, Ji'an)
Source: ADVANCED ENGINEERING MATERIALS  Volume: 22  Issue: 10  Article Number: 1901310  DOI: 10.1002/adem.201901310  Early Access Date: MAR 2020   Published: OCT 2020  
Abstract: Herein, an effective method is proposed for the fabrication of sequential colors on copper by adjusting femtosecond laser defocusing distance. The sequential evolution tendency of induced colors by adjusting laser defocusing distance is conducted. It is revealed that such a change of surface optical response is originated from the gradual evolution of three different kinds of structures. The angle-resolved spectrum of the colored surface is investigated. In addition, the simultaneously derived hydrophobicity of the colored surface is explored.
Accession Number: WOS:000563952900001
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Wang, Cong    0000-0003-2411-5788 
ISSN: 1438-1656
eISSN: 1527-2648

Record 12 of 333
Title: Optimization and Experiment of a Novel Compliant Focusing Mechanism for Space Remote Sensor
Author(s): Li, Y (Li, Yan); Ge, WJ (Ge, Wenjie); Zhang, X (Zhang, Xu); Tong, XX (Tong, Xinxing)
Source: SENSORS  Volume: 20  Issue: 23  Article Number: 6826  DOI: 10.3390/s20236826  Published: DEC 2020  
Abstract: The change of an external environment leads to the defocusing phenomenon of the space optical remote sensor. The performance of the focusing mechanism is related to the image quality of the remote sensor. It was optimized for a novel focusing mechanism comprised of a flexural hinge lever-type amplifier and several piezoelectric ceramics to improve the performance on high loads and large stroke in this research. It has advantages of a lightweight, simple structure and high reliability compared with the traditional focusing mechanism. The input displacement from the piezoelectric actuators was amplified by a two-stage flexure hinge lever-type mechanism. Dimensional parameters of the flexural hinges were considered as design variables. Based on the optimization ideology, reasonable compliance and dimension parameters of the flexural hinges were analyzed for the focusing mechanism. Simulation and experiments of deformation were conducted to validate the correctness of design optimization. The results show that the focusing mechanism designed by the proposed method has the capabilities of an amplification ratio of 100 times and a loading carrying capacity of 2 kg. This work provides a novel strategy to design an excellent focusing mechanism with lightweight, high loads and large stroke. Moreover, it is believed that this approach can be extended to other complex sensors.
Accession Number: WOS:000597916300001
PubMed ID: 33260361
eISSN: 1424-8220

Record 13 of 333
Title: High-performance concealment of defective pixel clusters in infrared imagers
Author(s): Chen, YH (Chen, Yaohong); Kang, JU (Kang, Jin U.); Zhang, GP (Zhang, Gaopeng); Cao, JZ (Cao, Jianzhong); Xie, QS (Xie, Qingsheng); Kwan, CM (Kwan, Chiman)
Source: APPLIED OPTICS  Volume: 59  Issue: 13  Pages: 4081-4090  DOI: 10.1364/AO.391668  Published: MAY 1 2020  
Abstract: Defective pixel concealment is a necessary procedure in infrared image processing and is widely used. However, current approaches are mainly focused on the concealment of isolated pixels and small defective pixel clusters. Consequently, these approaches cannot meet the requirements when applied to infrared detectors with large defective pixel clusters. In this paper, we present a novel and comprehensive approach to processing the image data acquired from infrared imagers with large and small defective pixel clusters. Our approach consists of preprocessing, coarse concealment, high dynamic range enhancement, and fine concealment by generative adversarial networks. Experiments using mid-wave infrared and long-wave infrared images demonstrated that the proposed approach achieves better results than the best conventional approach, known as transforming image completion, with the peak signal-to-noise ratio and structural similarity metrics improved by 2.7063 dB (16.3%) and 0.1951 dB (34.1%), respectively. (C) 2020 Optical Society of America
Accession Number: WOS:000537846600070
PubMed ID: 32400684
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Kwan, Chiman  N-7757-2015  0000-0002-4341-0769 
ISSN: 1559-128X
eISSN: 2155-3165

Record 14 of 333
Title: Design and Simulation of an Intelligent Current Monitoring System for Urban Rail Transit
Author(s): Yao, C (Yao, Cheng); Zhao, QL (Zhao, Qinglei); Ma, ZL (Ma, Zelong); Zhou, W (Zhou, Wei); Yao, T (Yao, Tong)
Source: IEEE ACCESS  Volume: 8  Pages: 35973-35978  DOI: 10.1109/ACCESS.2020.2975009  Published: 2020  
Abstract: Many urban rail transit (URT) systems adopt the DC traction power supply system. Because of the impedance and incomplete ground insulation of the running track, it is inevitable for a part of the traction current to flow into the ground from the track, creating the stray current. This type of current causes great safety hazards to the metal structures in and near the URT system. Considering the power supply mode of the URT, this paper explores the different resistances in each power supply section under unilateral power supply and bilateral power supply. Then, the defects of the current discharge method were identified in the context of stray current protection. To solve these defects, the backpropagation neural network (BPNN) was adopted to build a discharge flow prediction model. On this basis, an intelligent current monitoring system was established for the URT. Finally, the authors simulated the impact of each factor on stray current, and verified the reliability and stability of the proposed monitoring system. Compared with predicted values and the actual values, the prediction agrees with the actual data very well.
Accession Number: WOS:000528911500001
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Zhou, Weu  ABA-9056-2020   
ISSN: 2169-3536

Record 15 of 333
Title: In Vitro Bioactivity and Biocompatibility of Bio-Inspired Ti-6Al-4V Alloy Surfaces Modified by Combined Laser Micro/Nano Structuring
Author(s): Li, C (Li, Chen); Yang, Y (Yang, Yong); Yang, LJ (Yang, Lijun); Shi, Z (Shi, Zhen); Yang, PF (Yang, Pengfei); Cheng, GH (Cheng, Guanghua)
Source: MOLECULES  Volume: 25  Issue: 7  Article Number: 1494  DOI: 10.3390/molecules25071494  Published: APR 2020  
Abstract: The bioactivity and biocompatibility play key roles in the success of dental and orthopaedic implants. Although most commercial implant systems use various surface microstructures, the ideal multi-scale topographies capable of controlling osteointegration have not yielded conclusive results. Inspired by both the isotropic adhesion of the skin structures in tree frog toe pads and the anisotropic adhesion of the corrugated ridges on the scales of Morpho butterfly wings, composite micro/nano-structures, including the array of micro-hexagons and oriented nano-ripples on titanium alloy implants, were respectively fabricated by microsecond laser direct writing and femtosecond laser-induced periodic surface structures, to improve cell adherence, alignment and proliferation on implants. The main differences in both the bioactivity in simulated body fluid and the biocompatibility in osteoblastic cell MC3T3 proliferation were measured and analyzed among Ti-6Al-4V samples with smooth surface, micro-hexagons and composite micro/nano-structures, respectively. Of note, bioinspired micro/nano-structures displayed the best bioactivity and biocompatibility after in vitro experiments, and meanwhile, the nano-ripples were able to induce cellular alignment within the micro-hexagons. The reasons for these differences were found in the topographical cues. An innovative functionalization strategy of controlling the osteointegration on titanium alloy implants is proposed using the composite micro/nano-structures, which is meaningful in various regenerative medicine applications and implant fields.
Accession Number: WOS:000531833400019
PubMed ID: 32218344
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
LI, Chen    0000-0001-9442-1014 
eISSN: 1420-3049

Record 16 of 333
Title: Experimental study on a high-sensitivity optical fiber sensor in wide-range refractive index detection
Author(s): Meng, XJ (Meng, Xiaojian); Li, JS (Li, Jianshe); Guo, Y (Guo, Ying); Liu, YD (Liu, Yundong); Li, SG (Li, Shuguang); Guo, HT (Guo, Haitao); Bi, WH (Bi, Weihong); Lu, HB (Lu, Huibin); Cheng, TL (Cheng, Tonglei)
Source: JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS  Volume: 37  Issue: 10  Pages: 3063-3067  DOI: 10.1364/JOSAB.399424  Published: OCT 1 2020  
Abstract: A novel plasmonic sensor based on a photonic crystal fiber has been fabricated. Experimental results show that 2 cm is an optimal fiber length of the sensor for refractive index monitoring. It is found that the average wavelength sensitivity and the resolution of the proposed sensor are 4000 nm/RIU and 2.5 x 10(-5) RIU in the wind range of 1.3333-1.4035, respectively. In addition, this paper presents a set of operation flat roofs that is used in the side-polished fiber technique. Moreover, two effective methods of coating silver film are discussed in detail. The research in this paper has enlightening significance for exploring new optical fiber sensing technology and will open a new design methodology for optical fiber sensors. (C) 2020 Optical Society of America
Accession Number: WOS:000577130500031
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
, Jianshe Li  E-7375-2016  0000-0002-9580-281X 
Liu, Yundong    0000-0001-9899-1655 
ISSN: 0740-3224
eISSN: 1520-8540

Record 17 of 333
Title: A rapid analysis platform for investigating the cellular locations of bacteria using two-photon fluorescence lifetime imaging microscopy
Author(s): Sapermsap, N (Sapermsap, Natakorn); Li, DDU (Li, David Day-Uei); Al-Hemedawi, R (Al-Hemedawi, Ryath); Li, YH (Li, Yahui); Yu, J (Yu, Jun); Birch, DJ (Birch, David J. S.); Chen, Y (Chen, Yu)
Source: METHODS AND APPLICATIONS IN FLUORESCENCE  Volume: 8  Issue: 3  Article Number: 034001  DOI: 10.1088/2050-6120/ab854e  Published: JUL 2020  
Abstract: Facultative intracellular pathogens are able to live inside and outside host cells. It is highly desirable to differentiate their cellular locations for the purposes of fundamental research and clinical applications. In this work, we developed a novel analysis platform that allows users to choose two analysis models: amplitude weighted lifetime (tau(A)) and intensity weighted lifetime (tau(I)) for fluorescence lifetime imaging microscopy (FLIM). We applied these two models to analyse FLIM images of mouse Raw macrophage cells that were infected with bacteria Shigella Sonnei, adherent and invasive E. coli (AIEC) and Lactobacillus. The results show that the fluorescence lifetimes of bacteria depend on their cellular locations. The tau(A) model is superior in visually differentiating bacteria that are in extra- and intra-cellular and membrane-bounded locations, whereas the tau(I) model show excellent precision. Both models show speedy performances that analysis can be performed within 0.3 s. We also compared the proposed models with a widely used commercial software tool (tau(C), SPC Image, Becker & Hickl GmbH), showing similar tau(I) and tau(C) results. The platform also allows users to perform phasor analysis with great flexibility to pinpoint the regions of interest from lifetime images as well as phasor plots. This platform holds the disruptive potential of replacing z-stack imaging for identifying intracellular bacteria.
Accession Number: WOS:000528572700001
PubMed ID: 32235056
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Li, David  AAY-7092-2020   
Birch, David    0000-0001-6400-1270 
Chen, Yu    0000-0003-2427-3559 
Li, David    0000-0002-6401-4263 
ISSN: 2050-6120

Record 18 of 333
Title: Attention Mask R-CNN for Ship Detection and Segmentation From Remote Sensing Images
Author(s): Nie, X (Nie, Xuan); Duan, MY (Duan, Mengyang); Ding, HX (Ding, Haoxuan); Hu, BL (Hu, Bingliang); Wong, EK (Wong, Edward K.)
Source: IEEE ACCESS  Volume: 8  Pages: 9325-9334  DOI: 10.1109/ACCESS.2020.2964540  Published: 2020  
Abstract: In recent years, ship detection in satellite remote sensing images has become an important research topic. Most existing methods detect ships by using a rectangular bounding box but do not perform segmentation down to the pixel level. This paper proposes a ship detection and segmentation method based on an improved Mask R-CNN model. Our proposed method can accurately detect and segment ships at the pixel level. By adding a bottom-up structure to the FPN structure of Mask R-CNN, the path between the lower layers and the topmost layer is shortened, allowing the lower layer features to be more effectively utilized at the top layer. In the bottom-up structure, we use channel-wise attention to assign weights in each channel and use the spatial attention mechanism to assign a corresponding weight at each pixel in the feature maps. This allows the feature maps to respond better to the target's features. Using our method, the detection and segmentation mAPs increased from 70.6% and 62.0% to 76.1% and 65.8%, respectively.
Accession Number: WOS:000528555200001
ISSN: 2169-3536

Record 19 of 333
Title: Noise-like pulses with an h-shape from a 2 mu m semiconductor saturable-absorber mirror mode-locked fiber oscillator
Author(s): Wang, JR (Wang, JingRu); Cao, X (Cao, Xue); Xian, AH (Xian, AnHua); Chen, X (Chen, Xiang); Wu, QQ (Wu, QianQian); Liu, YY (Liu, YangYu); Ge, ZX (Ge, ZhiXiang); Zhou, W (Zhou, Wei); Wang, HT (Wang, HaoTian); Huang, HT (Huang, HaiTao); Wang, YS (Wang, YiShan); Li, W (Li, Wei); Matcher, SJ (Matcher, Stephen J.); Tang, DY (Tang, DingYuan); Shen, DY (Shen, DeYuan)
Source: LASER PHYSICS LETTERS  Volume: 17  Issue: 11  Article Number: 115101  DOI: 10.1088/1612-202X/abb1bc  Published: NOV 2020  
Abstract: We report on a novel type of h-shaped pulse with femtosecond substructures from a linear-cavity semiconductor saturable-absorber mirror mode-locked thulium-doped fiber laser. It yields a stable nanosecond h-shaped pulse-train with a pulse envelope width ranging from 880 ps to 1.41 ns with a typical substructure pulse duration around 440 fs. The obtained h-shaped pulse is a noise-like pulse with strong robustness to pump power changes and environmental perturbation. It can also operate in the harmonic mode-locking regime. The scheme makes the structure compact and stable, and can obtain a MHz repetition rate, which is advantageous for real-life applications
Accession Number: WOS:000575181900001
ISSN: 1612-2011
eISSN: 1612-202X

Record 20 of 333
Title: All-fiber spectral modulating device based on microfiber interferometer grown with tungsten disulfide
Author(s): Luo, M (Luo, Meng); Yang, XH (Yang, Xinghua); Teng, PP (Teng, Pingping); Kong, DP (Kong, Depeng); Liu, ZH (Liu, Zhihai); Gao, DH (Gao, Danheng); Li, ZN (Li, Zhanao); Wen, XY (Wen, Xingyue); Yuan, LB (Yuan, Libo); Li, K (Li, Kang); Copner, N (Copner, Nigel)
Source: INSTRUMENTATION SCIENCE & TECHNOLOGY  Volume: 48  Issue: 5  Pages: 505-517  DOI: 10.1080/10739149.2020.1739702  Early Access Date: MAR 2020   Published: SEP 2 2020  
Abstract: Here an integrated compact low-cost all-fiber optical spectrum control device based on a single fiber interferometer and tungsten disulfide is reported. Tungsten disulfide was deposited onto the surface of the non-adiabatic microfiber under the application of the radiation from an amplified spontaneous emission source. Next, the near-infrared light (NIR), which leaked through the strong evanescent field of the microfiber, excited the surrounding tungsten disulfide and generated heat due to the photothermal effect. Therefore, the phase shift of the interference spectrum was caused by the surrounding change in the refractive index (RI). In the experimental work at 1550 nm, a spectral shift equal to 0.8 nm was obtained following the use of a pump laser operating at 980 nm. In addition, the device can may be used as an all-optical switch with a modulation depth of 18.1%. The proposed tungsten disulfide-based all-fiber device has potential application in all-optical signal controllable devices.
Accession Number: WOS:000519488400001
ISSN: 1073-9149
eISSN: 1525-6030

Record 21 of 333
Title: Development of space-based diffractive telescopes
Author(s): Zhao, W (Zhao, Wei); Wang, X (Wang, Xin); Liu, H (Liu, Hua); Lu, ZF (Lu, Zi-feng); Lu, ZW (Lu, Zhen-wu)
Source: FRONTIERS OF INFORMATION TECHNOLOGY & ELECTRONIC ENGINEERING  Volume: 21  Issue: 6  Special Issue: SI  Pages: 884-902  DOI: 10.1631/FITEE.1900529  Early Access Date: MAR 2020   Published: JUN 2020  
Abstract: Membrane diffractive optical elements formed by fabricating microstructures on the substrates have two important characteristics, ultra-light mass (surface mass density < 0.1 kg/m2) and loose surface shape tolerances (surface accuracy requirements are on the order of magnitude of centimeter). Large-aperture telescopes using a membrane diffractive optical element as the primary lens have super large aperture, light weight, and low cost at launch. In this paper, the research and development on space-based diffractive telescopes are classified and summarized. First, the imaging theory and the configuration of diffractive-optics telescopes are discussed. Then, the developments in diffractive telescopes are introduced. Finally, the development prospects for this technology used as a high-resolution space reconnaissance system in the future are summarized, and the critical and relevant work that China should carry out is put forward.
Accession Number: WOS:000526864900001
ISSN: 2095-9184
eISSN: 2095-9230

Record 22 of 333
Title: Characterization of optical waveguide in chalcogenide glass formed by helium ion implantation
Author(s): Chen, JY (Chen, Jing-Yi); Zhou, Q (Zhou, Qi); Wang, Y (Wang, Yue); Zhu, QF (Zhu, Qi-Feng); Tang, ZL (Tang, Zhong-Liang); Guo, HT (Guo, Hai-Tao); Liu, CX (Liu, Chun-Xiao)
Source: INDIAN JOURNAL OF PHYSICS  Volume: 95  Issue: 6  Pages: 1239-1243  DOI: 10.1007/s12648-020-01768-6  Early Access Date: JUN 2020   Published: JUN 2021  
Abstract: In this work, an optical waveguide in the chalcogenide glass (80GeS(2)-15Ga(2)S(3)-5Sb(2)S(3)) is fabricated for the first time and its optical properties are investigated. A one-dimensional chalcogenide waveguide structure has been formed by 550 keV He(+)ion implantation with a dose of 4 x 10(16)ions/cm(2)at room temperature. The effective refractive indices of the guided modes at the wavelength of 632.8 nm were measured with the aid of the Model 2010 Prism Coupler system. The refractive index profile, a critical factor in the analysis of waveguide structure, was reconstructed by the reflectivity calculation method. It was found that a positive change of refractive index occurred in the waveguide region, and an optical barrier with decreased refractive index was built at the end of the ion trajectory, i.e., producing a type of "well + barrier" structure. The SRIM 2013 program was utilized to display the profile of the energy loss versus the penetrated depth when the incident ion beam implanted. The near-field intensity distribution for the fundamental mode along the TE polarization was simulated through the finite-difference beam propagation method. From our experiments, these data provide a great deal of useful information about the manufacture of the chalcogenide waveguide structure.
Accession Number: WOS:000542666600003
ISSN: 0973-1458
eISSN: 0974-9845

Record 23 of 333
Title: Efficient Optical Angular Momentum Manipulation for Compact Multiplexing and Demultiplexing Using a Dielectric Metasurface
Author(s): Li, SQ (Li, Siqi); Li, XY (Li, Xingyi); Zhang, L (Zhang, Lei); Wang, GX (Wang, Guoxi); Zhang, LX (Zhang, Lingxuan); Liu, ML (Liu, Mulong); Zeng, C (Zeng, Chao); Wang, LR (Wang, Leiran); Sun, QB (Sun, Qibing); Zhao, W (Zhao, Wei); Zhang, WF (Zhang, Wenfu)
Source: ADVANCED OPTICAL MATERIALS  Volume: 8  Issue: 8  Article Number: 1901666  DOI: 10.1002/adom.201901666  Early Access Date: FEB 2020   Published: APR 2020  
Abstract: Angular momentum (AM), one of the most basic physical properties of light, has attracted great interest of the scientific community due to its significant values in high-capacity optical communication. To realize AM multiplexing and demultiplexing, the methods based on metallic metasurface are proposed, which suffers from huge Ohmic losses. Besides, additional coupling elements are necessary for coupling the output light into single-mode waveguides. Here, an efficient and focused AM multiplexing and demultiplexing system based on dielectric metasurfaces are proposed and investigated. Employing the off-axis technique and spin photonic Hall effect, the orbital angular momentum (OAM) and spin angular momentum (SAM) multiplexing/demultiplexing can be achieved. A 10-channel AM multiplexing/demultiplexing system based on the proposed method is demonstrated. The demultiplexing efficiencies for all AM stats are above 8% and the maximum crosstalk among all AM states is -12.8 dB, which exhibits an excellent performance of the proposed metasurface for the AM demultiplexing. Furthermore, the output light is focused at the focal plane, which can be directly coupled into the single-mode waveguides and improve the compactness of the system. The proposed method provides an effective way for AM multiplexing and demultiplexing, which possess a crucial potential for high-capacity optical communication applications.
Accession Number: WOS:000518125700001
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Zhang, Lei  D-5462-2013  0000-0002-5113-1786 
ISSN: 2195-1071

Record 24 of 333
Title: Improved estimation of motion blur parameters for restoration from a single image
Author(s): Zhou, W (Zhou, Wei); Hao, XX (Hao, Xingxing); Wang, KD (Wang, Kaidi); Zhang, ZY (Zhang, Zhenyang); Yu, YX (Yu, Yongxiang); Su, HA (Su, Haonan); Li, K (Li, Kang); Cao, X (Cao, Xin); Kuijper, A (Kuijper, Arjan)
Source: PLOS ONE  Volume: 15  Issue: 9  Article Number: e0238259  DOI: 10.1371/journal.pone.0238259  Published: SEP 1 2020  
Abstract: This paper presents an improved method to estimate the blur parameters of motion deblurring algorithm for single image restoration based on the point spread function (PSF) in frequency spectrum. We then introduce a modification to the Radon transform in the blur angle estimation scheme with our proposed difference value vs angle curve. Subsequently, the auto-correlation matrix is employed to estimate the blur angle by measuring the distance between the conjugated-correlated troughs. Finally, we evaluate the accuracy, robustness and time efficiency of our proposed method with the existing algorithms on the public benchmarks and the natural real motion blurred images. The experimental results demonstrate that the proposed PSF estimation scheme not only could obtain a higher accuracy for the blur angle and blur length, but also demonstrate stronger robustness and higher time efficiency under different circumstances.
Accession Number: WOS:000568872300014
PubMed ID: 32870943
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Zhou, Weu  ABA-9056-2020   
Zhou, Wei    0000-0001-8328-3736 
Wang, Kaidi    0000-0001-8145-5530 
Kuijper, Arjan    0000-0002-6413-0061 
ISSN: 1932-6203

Record 25 of 333
Title: Doublet-waveplate polarization transceiver system for backscattering suppression in laser communication terminal
Author(s): Wang, J (Wang, Jing); Xue, JJ (Xue, Jingjing); Qu, ES (Qu, Enshi); Ren, LY (Ren, Liyong)
Source: OPTICS COMMUNICATIONS  Volume: 466  Article Number: 125621  DOI: 10.1016/j.optcom.2020.125621  Published: JUL 1 2020  
Abstract: The backscattering suppression capability of the optical signal transceiver is the key to establish a single wavelength full-duplex bidirectional laser communication link. When the signal is transmitted and received through the same telescope of the laser communication terminals, stray light from the high-power laser on mirrors will be received by the high-sensitivity detector, affecting the sensitivity of the system. In this paper, the polarization modulation characteristics of scattered light by the mirrors with different roughness are analyzed. The traditional system based on polarization splitting and transmitting with a single quarter waveplate is improved by using a doublet waveplate, i.e., a combination of a half waveplate and a quarter waveplate. The transceiver system including the off-axis optical antenna is developed and the signal transceiver isolation (ability of suppressing backscattering light) is improved by 7 similar to 8 dB. Although the system complexity is increased, the waveplate can work as a solar window to improve the environmental adaptability. The laser communication terminal would meet the requirements of further link communication, including inter-satellite networks under the same aperture condition.
Accession Number: WOS:000528945600034
ISSN: 0030-4018
eISSN: 1873-0310

Record 1 of 333
Title: Femtosecond laser manipulating underoil surface wettability for water removal from oil
Author(s): Wu, JR (Wu, Junrui); Yin, K (Yin, Kai); Li, M (Li, Ming); Xiao, S (Xiao, Si); Wu, ZP (Wu, Zhipeng); Wang, K (Wang, Kai); Duan, JA (Duan, Ji-An); He, J (He, Jun)
Source: COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS  Volume: 601  Article Number: 125030  DOI: 10.1016/j.colsurfa.2020.125030  Published: SEP 20 2020  
Abstract: The oil containing a small amount of water droplets have induced serious operation malfunctions for precision industrial equipment and even brought fatal disasters, which have aroused widespread concern. However, developing an effective strategy for removal of water from oil is still an enormous challenge. Here, we present a rapid and facile method for fabricating underoil superhydrophilic surface by one-step femtosecond laser direct writing technology. Interestingly, two extreme underoil wettability statuses can be achieved through tuning the scanning velocity (V). Concretely, the pristine underoil hydrophobic titanium sheet will become underoil superhydrophilicity when V is 0.1 m/s, while it will exhibit underoil superhydrophobicity when V increases to 3 m/s. Moreover, the underoil superhydrophilic surface shows excellent water absorption, which could realize the purification of oil contains water droplets regardless of the oil types, and the corresponding mechanism is propounded. We believe that femtosecond laser micromachining has tremendous superiority in solving the problem of oil containing water droplets.
Accession Number: WOS:000559034700007
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
HE, Jun  C-5197-2008  0000-0002-1479-285X 
Yin, Kai  S-9883-2017  0000-0002-0763-3834 
ISSN: 0927-7757
eISSN: 1873-4359

Record 2 of 333
Title: Learning Non-Local Spatial Correlations To Restore Sparse 3D Single-Photon Data
Author(s): Chen, SM (Chen, Songmao); Halimi, A (Halimi, Abderrahim); Ren, XM (Ren, Ximing); McCarthy, A (McCarthy, Aongus); Su, XQ (Su, Xiuqin); McLaughlin, S (McLaughlin, Stephen); Buller, GS (Buller, Gerald S.)
Source: IEEE TRANSACTIONS ON IMAGE PROCESSING  Volume: 29  Pages: 3119-3131  DOI: 10.1109/TIP.2019.2957918  Published: 2020  
Abstract: This paper presents a new algorithm for the learning of spatial correlation and non-local restoration of single-photon 3D Lidar images acquired in the photon starved regime (fewer or less than one photon per pixel) or with a reduced number of scanned spatial points (pixels). The algorithm alternates between three steps: (i) extract multi-scale information, (ii) build a robust graph of non-local spatial correlations between pixels, and (iii) the restoration of depth and reflectivity images. A non-uniform sampling approach, which assigns larger patches to homogeneous regions and smaller ones to heterogeneous regions, is adopted to reduce the computational cost associated with the graph. The restoration of the 3D images is achieved by minimizing a cost function accounting for the multi-scale information and the non-local spatial correlation between patches. This minimization problem is efficiently solved using the alternating direction method of multipliers (ADMM) that presents fast convergence properties. Various results based on simulated and real Lidar data show the benefits of the proposed algorithm that improves the quality of the estimated depth and reflectivity images, especially in the photon-starved regime or when containing a reduced number of spatial points.
Accession Number: WOS:000510750900019
PubMed ID: 31831417
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
HALIMI, Abderrahim  AAI-8802-2020  0000-0002-8112-5352 
McLaughlin, Stephen  H-2700-2016  0000-0002-9558-8294 
Su, Xiuqin    0000-0002-6554-2762 
Chen, Songmao    0000-0003-3971-1355 
McCarthy, Aongus    0000-0002-0124-0060 
ISSN: 1057-7149
eISSN: 1941-0042

Record 3 of 333
Title: Construction and investigation of a planar waveguide in photo-thermal-refractive glass by proton implantation
Author(s): Chen, JY (Chen, Jing-Yi); Xie, ZH (Xie, Zhong-Hu); Li, WN (Li, Wei-Nan); Lin, SB (Lin, She-Bao); Zhang, LL (Zhang, Liao-Lin); Liu, CX (Liu, Chun-Xiao)
Source: OPTIK  Volume: 207  Article Number: 164461  DOI: 10.1016/j.ijleo.2020.164461  Published: APR 2020  
Abstract: In this paper, the fabrication of optical planar waveguide in PTR glass by proton implantation is reported for the first time to our knowledge. The planar waveguide with a width of approximately 3.4 mu m was generated under the condition of 400 keV H+ ion implantation with a dose of 8.0 x 10 16 ions . cm(-2) at room temperature. The formation mechanism of PTR glass waveguide was illustrated with the aid of the SRIM program. The optical characteristics of the PTR waveguide, such as refractive index profile and near-field intensity distribution, were investigated in detail. The fabricated PTR waveguide presents a structure of both index-well and optical barrier according to the reconstructed refractive index profile. The finite-difference beam propagation method was carried out to simulate guiding modal distribution. Besides, in order to study the thermal stability of the H+-implanted PTR waveguide, annealing treatment was conducted at different temperatures.
Accession Number: WOS:000523186200024
ISSN: 0030-4026
eISSN: 1618-1336

Record 4 of 333
Title: A Survey of Human Action Analysis in HRI Applications
Author(s): Ji, YL (Ji, Yanli); Yang, Y (Yang, Yang); Shen, FM (Shen, Fumin); Shen, HT (Shen, Heng Tao); Li, XL (Li, Xuelong)
Source: IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY  Volume: 30  Issue: 7  Pages: 2114-2128  DOI: 10.1109/TCSVT.2019.2912988  Published: JUL 2020  
Abstract: The human action is an important information source for human social interaction, and it simultaneously plays a crucial role in human-robot interaction (HRI). For a natural and fluent interaction, robots are required to understand human actions and have the capacity to predict action intentions and to imitate human actions for an appropriate response. Currently, existing survey papers for the action recognition mainly summarize algorithms that perform action recognition in experimental scenarios, and survey papers of the HRI mainly introduced various interaction interfaces in the HRI. Different from these surveys, we focus on the human action analysis on robot platforms for the HRI application, including the body motion and gestures. We review the existing HRI related references involving the action recognition, prediction, and the robot imitation of the human action. Moreover, we give a summary of robot platforms and action datasets that are frequently used in the study of HRI. Finally, we give an analysis on the development trend and future research directions of action analysis for the HRI applications.
Accession Number: WOS:000545456800027
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Li, Xuelong  ABF-3381-2020   
ISSN: 1051-8215
eISSN: 1558-2205

Record 5 of 333
Title: Tuning optical force of dielectric/metal core-shell placed above Au film
Author(s): Zhang, JC (Zhang Jia-Chen); Yu, WX (Yu Wei-Xing); Xiao, FJ (Xiao Fa-Jun); Zhao, JL (Zhao Jian-Lin)
Source: ACTA PHYSICA SINICA  Volume: 69  Issue: 18  Article Number: 184206  DOI: 10.7498/aps.69.20200214  Published: SEP 20 2020  
Abstract: Manipulating the core-shell structure with the optical force has been extensively studied, giving birth to applications such as particle sorting, biomarkers and drug delivery. Tailoring the optical force exerted on the core-shell above the metallic film remains unexplored, despite the obvious benefits for both fundamental research and applications including strong coupling, surface enhanced spectroscopy, nanolaser, and nanoscale sensing. In this work, we systematically investigate the optical force exerted on a dielectric/metal core-shell above a gold film by utilizing the Maxwell stress tensor formalism. It is found that at the present gold substrate, the optical force on the core-shell can be one order of magnitude larger than that on the individual core-shell due to the strong coupling between the core-shell and the gold film. Interestingly, the direction of the optical force can be reversed from positive to negative by distributing the local field from the upside of coreshell to the structure gap through changing the excitation wavelength. Furthermore, we demonstrate that the magnitude and peak wavelength of the optical force can be well controlled by altering the structure gap, the size and refractive index of the core. More specifically, it is found that the coupling strength between the coreshell and the gold film decreases with the gap size increasing. As a result, we observe the blue shift of bonding mode and the decrease of local field in the gap, which leads the force peak wavelength to be blue-shifted and the force peak magnitude to decrease, respectively. Also, by increasing the radius and refractive index of the core, a red shift of force peak is accompanied with the red shift of the bonding mode. In addition, the force peak magnitude follows the same trend as the total local field enhancement factor when the radius and refractive index of the core change. We hope that our results open the way to control the cavity size of particle on film structure, which would be beneficial for tailoring the light matter interaction even down to single molecular level and promises to have the applications in novel functional photonic devices.
Accession Number: WOS:000575778500009
ISSN: 1000-3290

Record 6 of 333
Title: Optical Trapping and Manipulating with a Silica Microring Resonator in a Self-Locked Scheme
Author(s): Ho, VWL (Ho, Victor W. L.); Chang, Y (Chang, Yao); Liu, Y (Liu, Yang); Zhang, C (Zhang, Chi); Li, YH (Li, Yuhua); Davidson, RR (Davidson, Roy R.); Little, BE (Little, Brent E.); Wang, GH (Wang, Guanghui); Chu, ST (Chu, Sai T.)
Source: MICROMACHINES  Volume: 11  Issue: 2  Article Number: 202  DOI: 10.3390/mi11020202  Published: FEB 2020  
Abstract: Based on the gradient force of evanescent waves in silica waveguides and add-drop micro-ring resonators, the optical trapping and manipulation of micro size particles is demonstrated in a self-locked scheme that maintains the on-resonance system even if there is a change in the ambient temperature or environment. The proposed configuration allows the trapping of particles in the high Q resonator without the need for a precise wavelength adjustment of the input signal. On the one hand, a silicon dioxide waveguide having a lower refractive index and relatively larger dimensions facilitates the coupling of the laser with a single-mode fiber. Furthermore, the experimental design of the self-locked scheme reduces the sensitivity of the ring to the environment. This combination can trap the micro size particles with a high stability while manipulating them with high accuracy.
Accession Number: WOS:000520181500091
PubMed ID: 32075346
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Chu, Sai T  D-3312-2014  0000-0001-8263-8507 
LI, Yuhua    0000-0003-2402-3234 
HO, Wai Lok    0000-0002-3486-3600 
eISSN: 2072-666X

Record 7 of 333
Title: Multispectral curved compound eye camera
Author(s): Yu, XD (Yu, Xiaodan); Liu, CY (Liu, Chenyang); Zhang, YJ (Zhang, Yuanjie); Xu, HR (Xu, Huangrong); Wang, YY (Wang, Yuanyuan); Yu, WX (Yu, Weixing)
Source: OPTICS EXPRESS  Volume: 28  Issue: 7  Pages: 9216-9231  DOI: 10.1364/OE.385368  Published: MAR 30 2020  
Abstract: In this work, we propose a new type of multispectral imaging system, named multispectral curved compound eye camera (MCCEC). The so called MCCEC consists of three subsystems, a curved micro-lens array integrated with selected narrow-band optical filters, an optical transformation subsystem, and the data processing unit with an image sensor. The novel MCCEC system can achieve multi-spectral imaging at an ultra-large field of view (FOV), and obtain information of multiple spectrum segments at real time. Moreover, the system has the advantages of small size, light weight, and high sensitivity in comparison with conventional multispectral cameras. In current work, we mainly focus on the optical design of the MCCEC based on the overlap of FOV between the neighboring clusters of ommatidia to achieve the multispectral imaging at an ultra-large FOV. The optical layout of the curved micro-lens array, narrow-band filter array and the optical relay system for image plane transformation are carefully designed and optimized. The whole size of the optical system is 93 mm x 42 mm x 42 mm. The simulation results show that a maximum FOV of about 120 degrees can be achieved for seven-waveband multispectral imaging with center wavelengths of 480 nm, 550 nm, 591 nm, 676 nm, 704 nm, 740 nm, and 767 nm. The new designed MCCEC has a great potential as an airborne or satellite-born payload for real time remote sensing and thus paves a new way for the design of compact and light-weight spectral-imaging cameras with an ultra large FOV. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Accession Number: WOS:000523766500018
PubMed ID: 32225533
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Yu, Weixing  G-3658-2012  0000-0002-3216-526X 
ISSN: 1094-4087

Record 8 of 333
Title: High-precision long-distance measurement with an intensity-modulated frequency comb
Author(s): Li, GC (Li, Guicun); Fang, YM (Fang, Yami); Zhang, H (Zhang, Hao); Sun, J (Sun, Jun); Liu, ZM (Liu, Zongming); Song, T (Song, Ting); Ji, RY (Ji, Rongyi); Wang, YS (Wang, Yishan)
Source: APPLIED OPTICS  Volume: 59  Issue: 24  Pages: 7292-7298  DOI: 10.1364/AO.398290  Published: AUG 20 2020  
Abstract: We describe an improved synthetic wavelength method for high-precision long-distance measurement with a repetition-rate-locked femtosecond laser modulated by a fiber Mach-Zehnder electro-optic intensity modulator. Harmonics of the repetition rate accompanied with modulating sidebands will be generated via intermode beating, which will be utilized for high-precision ranging. The nonambiguity range is significantly extended with a relatively low modulation frequency, and the ambiguous distance is unwrapped by synchronous phase-shift measurements of a synthetic wavelength chain without any auxiliary measurement operation. Our experiment shows a precision better than 20 mu m at 46 m range, and a high-precision translation stage is applied for preliminary test and proof-of-principle demonstration. The demonstrated system is simple and can be easily integrated, and it will find widespread applications in large-scale metrology such as large-volume manufacturing and precision formation flying. (C) 2020 Optical Society of America
Accession Number: WOS:000571481100017
PubMed ID: 32902493
ISSN: 1559-128X
eISSN: 2155-3165

Record 9 of 333
Title: Fault prediction of gas-insulated system with hypersensitive optical monitoring and spectral information
Author(s): Ren, M (Ren, Ming); Zhang, CX (Zhang, Chongxing); Dong, M (Dong, Ming); He, ZQ (He, Zhengquan)
Source: INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS  Volume: 119  Article Number: 105945  DOI: 10.1016/j.ijepes.2020.105945  Published: JUL 2020  
Abstract: Hazardous discharge is the primary threat to power apparatus. Utilizing the fact that discharge is companied by intrinsic light radiation in specific spectral bands, a micro ternary spectral hypersensitive sensor array is developed for condition monitoring and fault prediction. With this new concept, a multispectral diagnosis strategy is proposed and implemented on a gas-insulated system, demonstrating significant potential for fault classification as well as quantitative risk evaluation, circumventing the necessities of phase-resolved statistics and complex denoising algorithms which are the most challenging but necessary aspects for traditional discharge diagnosis. Thus, it is an intrinsic and stable approach for practical fault prediction, especially for HVDC gas-insulated system.
Accession Number: WOS:000523595900045
ISSN: 0142-0615
eISSN: 1879-3517

Record 10 of 333
Title: Broadband generation of photon-pairs from a CMOS compatible device
Author(s): Sugiura, K (Sugiura, K.); Yin, Z (Yin, Z.); Okamoto, R (Okamoto, R.); Zhang, L (Zhang, L.); Kang, L (Kang, L.); Chen, J (Chen, J.); Wu, P (Wu, P.); Chu, ST (Chu, S. T.); Little, BE (Little, B. E.); Takeuchi, S (Takeuchi, S.)
Source: APPLIED PHYSICS LETTERS  Volume: 116  Issue: 22  DOI: 10.1063/5.0009361  Published: JUN 1 2020  
Abstract: Frequency entangled photons have potential for various quantum applications. Recently, on-chip photon-pair sources made by CMOS compatible processes have attracted attention. In this paper, we report broadband generation of photon-pairs via a spontaneous four-wave mixing process using a CMOS compatible ring resonator. We performed frequency-correlation between the signal and idler photons by frequency-resolved coincidence detection and confirmed that the signal and idler photons are correlated over 59 frequency modes, a bandwidth of 23.6nm, which are the largest numbers achieved to date. Furthermore, we reproduced the experimentally observed joint spectral intensity from the obtained transmission spectrum of the resonator involving the information of the dispersion of the device.
Accession Number: WOS:000540745800001
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Chu, Sai T  D-3312-2014  0000-0001-8263-8507 
Yin, Zhenghao    0000-0002-8134-6139 
Takeuchi, Shigeki    0000-0001-7731-003X 
ISSN: 0003-6951
eISSN: 1077-3118

Record 11 of 333
Title: Optimization of a multi-TW few-cycle 1.7-mu m source based on Type-I BBO dual-chirped optical parametric amplification
Author(s): Xu, L (Xu, Lu); Nishimura, K (Nishimura, Kotaro); Suda, A (Suda, Akira); Midorikawa, K (Midorikawa, Katsumi); Fu, YX (Fu, Yuxi); Takahashi, EJ (Takahashi, Eiji J.)
Source: OPTICS EXPRESS  Volume: 28  Issue: 10  Pages: 15138-15147  DOI: 10.1364/OE.392045  Published: MAY 11 2020  
Abstract: This paper presents the optimization of a dual-chirped optical parametric amplification (DC-OPA) scheme for producing an ultrafast intense infrared (IR) pulse. By employing a total energy of 0.77 J Ti:sapphire pump laser and type-I BBO crystals, an IR pulse energy at the center wavelength of 1.7 mu m exceeded 0.1 J using the optimized DC-OPA. By adjusting the injected seed spectrum and prism pair compressor with a gross throughput of over 70%, the 1.7-mu m pulse was compressed to 31 fs, which resulted in a peak power of up to 2.3 TW. Based on the demonstration of the BBO type-I DC-OPA, we propose a novel OPA scheme called the "dual pump DC-OPA" for producing a high-energy IR pulse with a two-cycle duration. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Accession Number: WOS:000538870000086
PubMed ID: 32403546
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Takahashi, Eiji J.  A-6936-2011   
ISSN: 1094-4087

Record 12 of 333
Title: Hierarchical Feature Fusion Network for Salient Object Detection
Author(s): Li, XL (Li, Xuelong); Song, DW (Song, Dawei); Dong, YS (Dong, Yongsheng)
Source: IEEE TRANSACTIONS ON IMAGE PROCESSING  Volume: 29  Pages: 9165-9175  DOI: 10.1109/TIP.2020.3023774  Published: 2020  
Abstract: Convolutional Neural Network (CNN) has shown their advantages in salient object detection. CNN can generate great saliency maps because it can obtain high-level semantic information. And the semantic information is usually achieved by stacking multiple convolutional layers and pooling layers. However, multiple pooling operations will reduce the size of the feature map and easily blur the boundary of the salient object. Therefore, such operations are not beneficial to generate great saliency results. To alleviate this issue, we propose a novel edge information-guided hierarchical feature fusion network (HFFNet). Our network fuses features hierarchically and retains accurate semantic information and clear edge information effectively. Specifically, we extract image features from different levels of VGG. Then, we fuse the features hierarchically to generate high-level semantic information and low-level edge information. In order to retain better information at different levels, we adopt a one-to-one hierarchical supervision strategy to supervise the generation of low-level information and high-level information respectively. Finally, we use low-level edge information to guide the saliency map generation, and the edge guidance fusion is able to identify saliency regions effectively. The proposed HFFNet has been extensively evaluated on five traditional benchmark datasets. The experimental results demonstrate that the proposed model is fairly effective in salient object detection compared with 10 state-of-the-art models under different evaluation indicators, and it is superior to most of the comparison models.
Accession Number: WOS:000574739100003
PubMed ID: 32946391
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Li, Xuelong  ABF-3381-2020   
ISSN: 1057-7149
eISSN: 1941-0042

Record 13 of 333
Title: TiO2-based compact TM-pass polarizer at visible wavelengths with ultra-low power loss
Author(s): Zhao, QF (Zhao, Qinfeng); Yu, WQ (Yu, Wenqi); Zhao, YR (Zhao, Yiru); Dai, SX (Dai, Shuangxing); Liu, JG (Liu, Jianguo)
Source: OPTICS COMMUNICATIONS  Volume: 475  Article Number: 126282  DOI: 10.1016/j.optcom.2020.126282  Published: NOV 15 2020  
Abstract: A compact transverse magnetic (TM)-pass/transverse electric (TE)-stop polarizer with ultra-low power loss at visible wavelengths is theoretically proposed on a TiO2-based platform, which is achieved via the surface plasmon polaritons effect in the hybrid plasmonic grating structure. We design the TiO2 waveguide and optimize the structural parameters of the hybrid plasmonic grating using finite element method (FEM) and 3D Finite-Difference-Time-Domain (FDTD) simulation. The proposed polarizer shows a high extinction ratio over 27 dB from the wavelength of 0.54 to 0.57 pm, a low insertion loss of 0.087 dB at 0.552 pm, a compact size of only 2.64 pm and a great fabrication error tolerance.
Accession Number: WOS:000563999900008
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Zhao, Qinfeng    0000-0001-8435-409X 
ISSN: 0030-4018
eISSN: 1873-0310

Record 14 of 333
Title: Fully noncontact measurement of inner cracks in thick specimen with fiber-phased-array laser ultrasonic technique
Author(s): Pei, CX (Pei, Cuixiang); Yi, DC (Yi, Dongchi); Liu, TH (Liu, Tianhao); Kou, X (Kou, Xing); Chen, ZM (Chen, Zhenmao)
Source: NDT & E INTERNATIONAL  Volume: 113  Article Number: 102273  DOI: 10.1016/j.ndteint.2020.102273  Published: JUL 2020  
Abstract: To realize a fully noncontact ultrasonic testing method for inner cracks inspection in thick metal specimen, a phased array laser ultrasonic testing system with using a compact optic fiber array bundle and a laser inter-ferometer is developed in this study. The focusing and steering of the shear wave and longitudinal wave generated with seven fiber-phased-array laser sources in thermoelastic regime is investigated by a numerical simulation and validated by the experiment. A non-contact measurement of the inner-surface cracks by both the angle-beam testing method and time-of-flight diffraction method with the fiber-phased-array laser ultrasonic technique have been studied.
Accession Number: WOS:000534258800001
ISSN: 0963-8695
eISSN: 1879-1174

Record 15 of 333
Title: Research on Microhole Processing Technology Based on the Femtosecond-Laser Spiral Trepanning Method
Author(s): Li, FP (Li, Fengping); Feng, G (Feng, Guang); Yang, XJ (Yang, Xiaojun); Li, XG (Li, Xiaogang); Ma, G (Ma, Guang); Lu, CJ (Lu, Chengji)
Source: APPLIED SCIENCES-BASEL  Volume: 10  Issue: 21  Article Number: 7508  DOI: 10.3390/app10217508  Published: NOV 2020  
Abstract: Featured Application
Film hole; fuel injection nozzle; microfluidic chips.
Microholes have crucial applications in aerospace, the automotive industry, and other industries. In this study, the microhole processing technology based on the femtosecond-laser spiral trepanning method was investigated. By adjusting the spiral scanning path, laser power distribution, and defocusing amount to control laser energy distribution, an inverted cone hole, straight hole, and normal cone hole were obtained finally. The morphology and element of the microhole were investigated by scanning electron microscopy (SEM) equipped with energy-dispersive X-ray spectroscopy (EDX). The experimental results of the femtosecond-laser spiral trepanning method could achieve fewer impurities. Finally, the formation mechanisms of different microholes are explained in detail. The method is simpler and more efficient than the traditional microhole processing technology. The femtosecond-laser spiral trepanning method with controllable hole roundness, accuracy, and taper has important practical significance in microhole processing.
Accession Number: WOS:000589028100001
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Li, Fengping    0000-0002-8535-112X 
eISSN: 2076-3417

Record 16 of 333
Title: Bioinspired surface hierarchical microstructures of Ti6Al4V alloy with a positive effect on osteoconduction
Author(s): Li, C (Li, Chen); Yang, LJ (Yang, Lijun); Liu, N (Liu, Nan); Yang, Y (Yang, Yong); Zhao, J (Zhao, Jing); Yang, PF (Yang, Pengfei); Cheng, GH (Cheng, Guanghua)
Source: SURFACE & COATINGS TECHNOLOGY  Volume: 388  Article Number: 125594  DOI: 10.1016/j.surfcoat.2020.125594  Published: APR 25 2020  
Abstract: Osteoconduction is critical for the success of dental and orthopaedic implants. Inspired by the remarkable adhesion of the skin structures in tree frog toe pads, biomimetic hierarchical surface structures on titanium alloy implants are fabricated by laser surface texturing and chemistry surface treatment in this work, to improve osteoconduction on implants. The main differences in the wettability, bioactivity in simulated body fluid and osteoblastic cell MC3T3 proliferation were measured and analyzed among Ti6Al4V samples with smooth surface, micro-hexagons and hierarchical structures, respectively. Noteworthy, bioinspired hierarchical structures displayed the lowest contact angle in hydrophilicity, best bioactivity and excellent cell proliferation. The reasons for these differences were found and discussed in the topographical cues and bioactive surface layer. An innovative functionalization strategy of improving the osteoconduction on titanium alloy implants was proposed using the hierarchical structures, which is meaningful in various tissue engineering applications and implant fields.
Accession Number: WOS:000526989400020
ISSN: 0257-8972

Record 17 of 333
Title: Generation of multimode quantum correlation with energy-level cascaded four-wave mixing processes
Author(s): Li, JW (Li, Jiawei); Li, W (Li, Wei); Niu, MQ (Niu, Mengqi); Lin, YX (Lin, Yixing); Li, CB (Li, Changbiao); Cai, Y (Cai, Yin); Zhang, YP (Zhang, Yanpeng)
Source: ANNALS OF PHYSICS  Volume: 422  Article Number: 168316  DOI: 10.1016/j.aop.2020.168316  Published: NOV 2020  
Abstract: Multimode quantum correlation has important applications in the field of quantum information. In this paper, we propose a compact scheme to generate multiple quantum correlated beams based on energy-level cascaded four-wave mixing (EC-FWM) process in a single atomic medium of rubidium. Injecting two strong pump beams with different frequencies and one weak probe beam into one rubidium vapor, four possible paramet-rically amplified FWM (PA FWM) processes can coexist under different phase matching conditions. Within the scheme, the weak probe beam is amplified and three coherent beams are generated, which can also be seen as an eight-wave mixing (EWM) process when certain phase matching condition is satisfied. Based on the energy level system of the scheme, three different cascaded structure models are employed to study the quantum correlation between the four generated beams. Amplitude and phase quadratures squeezing and intensity squeezing of the threeand four-mode are calculated via the input-output relations of the system. We found versatile multimode squeezing can be generated in all the structures, but the degree of squeezing and its distribution among the modes are different, depending on the specific structure. Furthermore, the relation of the quantum correlation, as well as the eigenmodes and eigenvalues of the four-mode quantum states are studied. (C) 2020 Elsevier Inc. All rights reserved.
Accession Number: WOS:000591352500008
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
CAI, Yin  AAC-3779-2019  0000-0001-6781-7857 
ISSN: 0003-4916
eISSN: 1096-035X

Record 18 of 333
Title: Reconstructing of Embedded High-Aspect-Ratio Nano-Voids Generated by Ultrafast Laser Bessel Beams
Author(s): Chen, TQ (Chen, Tianqu); Zhang, GD (Zhang, Guodong); Wang, YS (Wang, Yishan); Li, XL (Li, Xuelong); Stoian, R (Stoian, Razvan); Cheng, GH (Cheng, Guanghua)
Source: MICROMACHINES  Volume: 11  Issue: 7  Article Number: 671  DOI: 10.3390/mi11070671  Published: JUL 2020  
Abstract: Ultrafast non-diffractive Bessel laser beams provide strong light confinement and show robust advantages for fabricating high-aspect-ratio nanoscale structures inside transparent materials. They take the form of nanoscale voids with typical diameters well below the wavelength and aspect ratio of more than 1000. Delivering 3D morphologies of such nanoscale voids is an important issue to evaluate the result for fabrication. However, the characterization of such laser-induced structures is a difficult task. Here, an accurate and time-saving tomography-like methodology is proposed and adopted for reconstructing the morphology of high-aspect-ratio nano-holes. The technique allows an accurate assertion of laser parameters and position on nano-structured features. The reconstructed configuration reveals that nanoholes morphologies have a close relationship with energy distribution in the focal region. It suggests that the configuration of micro-explosion can be controlled by laser energy deposition in the process of laser-matter interaction down to the nanoscale.
Accession Number: WOS:000554205500001
PubMed ID: 32664216
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Li, Xuelong  ABF-3381-2020   
eISSN: 2072-666X

Record 19 of 333
Title: Design of a novel high-performance ultrafast optical framing camera
Author(s): Lei, X (Lei, X.); Cai, C (Cai, C.); Zhang, M (Zhang, M.); Wu, S (Wu, S.); Wang, J (Wang, J.); Tian, J (Tian, J.); Lu, Y (Lu, Y.); Wen, W (Wen, W.); Pei, C (Pei, C.); Liu, A (Liu, A.)
Source: JOURNAL OF INSTRUMENTATION  Volume: 15  Issue: 3  Article Number: P03007  DOI: 10.1088/1748-0221/15/03/P03007  Published: MAR 2020  
Abstract: The analysis of fast physical phenomena is a relevant tool in several fields including atomic physics and photochemistry. In turn, to record phenomena occurring on an ultra-short time scale, one needs an imaging system that can accurately capture the event. In this paper, we propose a novel ultrafast optical framing camera that achieves a spatial resolution up to 36.6 LP/mm while keeping a high temporal resolution of 3.25 ns using a digital delay generator. Our technique involves the splitting of light into four beams and their imaging on four ICCD cameras. In addition, the data transfer system is designed to combine data-streams from multiple digital ports into a single output, thus providing a compact user interface. The characteristic parameters influencing the temporal resolution of the image intensifier has been analyzed, and the framing camera has been experimentally assessed. Our results show that a temporal resolution of 3.25 ns and a spatial resolution of 36.6 LP/mm can be obtained. We foresee the use of our apparatus for inertial confined fusion.
Accession Number: WOS:000528040600007
ISSN: 1748-0221

Record 20 of 333
Title: Electromagnetic Performance of the Novel Hybrid-Pole Permanent Magnet Machines for High Peak Torque Density
Author(s): Liu, YX (Liu, Yu-Xi); Cao, JW (Cao, Ji-Wei); Gao, QH (Gao, Qin-He); Liu, ZH (Liu, Zhi-Hao); Lu, YC (Lu, Ya-Chao); Sun, ZY (Sun, Zhi-Yin)
Source: IEEE ACCESS  Volume: 8  Pages: 220384-220393  DOI: 10.1109/ACCESS.2020.3043432  Published: 2020  
Abstract: This paper proposes two novel hybrid rotors permanent magnet (PM) machines for the high torque density in short duration condition operation. In order to enhance the torque performance, the flux concentrated structure of spoke-type PM is employed to increase the air-gap flux density. Meanwhile, the non-magnetic connector of the rotor is employed to eliminate the magnetic flux leakage. The rotors of the conventional machines and the proposed machines are optimized by the finite element analysis (FEA). Furthermore, based on the comparisons of electromagnetic performances for the optimized machines, including the open-circuit flux density, torque, PM eddy current loss, overload capability, the characteristics of the proposed machines are analyzed. The results indicate that the proposed machine can improve the torque at rated and overload operation with growth rate 14.3% and 13.1%, respectively. Finally, a 12-slots/10-pole PM machine is prototyped and FEA is to be validated.
Accession Number: WOS:000600304900001
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Liu, Yuxi    0000-0002-0182-084X 
ISSN: 2169-3536

Record 21 of 333
Title: Design and Fabrication of Dual-Scale Broadband Antireflective Structures on Metal Surfaces by Using Nanosecond and Femtosecond Lasers
Author(s): Lou, R (Lou, Rui); Zhang, GD (Zhang, Guodong); Li, GY (Li, Guangying); Li, XL (Li, Xuelong); Liu, Q (Liu, Qing); Cheng, GH (Cheng, Guanghua)
Source: MICROMACHINES  Volume: 11  Issue: 1  Article Number: 20  DOI: 10.3390/mi11010020  Published: JAN 2020  
Abstract: Antireflective surfaces, with their great potential applications, have attracted tremendous attention and have been the subject of extensive research in recent years. However, due to the significant optical impedance mismatch between a metal surface and free space, it is still a challenging issue to realize ultralow reflectance on a metal surface. To address this issue, we propose a two-step strategy for constructing antireflective structures on a Ti-6Al-4V (TC4) surface using nanosecond and femtosecond pulsed lasers in combination. By controlling the parameters of the nanosecond laser, microgrooves are first scratched on the TC4 surface to reduce the interface reflection. Then, the femtosecond laser is focused onto the sample surface with orthogonal scanning to induce deep air holes and nanoscale structures, which effectively enhances the broadband absorption. The antireflection mechanism of the dual-scale structures is discussed regarding morphological characterization and hemispherical reflectance measurements. Finally, the modified sample surface covered with micro-nano hybrid structures is characterized by an average reflectance of 3.1% over the wavelengths ranging from 250 nm to 2250 nm.
Accession Number: WOS:000514309100020
PubMed ID: 31878117
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Li, Xuelong  ABF-3381-2020   
eISSN: 2072-666X

Record 22 of 333
Title: Evolution properties of the orbital angular momentum spectrum of twisted Gaussian Schell-model beams in turbulent atmosphere
Author(s): Zhou, MY (Zhou, Mengyao); Fan, WC (Fan, Weichen); Wu, GF (Wu, Gaofeng)
Source: JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION  Volume: 37  Issue: 1  Pages: 142-148  DOI: 10.1364/JOSAA.37.000142  Published: JAN 1 2020  
Abstract: We derive the analytical formula of the energy weight of each orbital angular momentum (OAM) mode of twisted Gaussian Schell-model (TGSM) beams propagating in weak turbulent atmosphere. The evolution of its OAM spectrum is studied by numerical calculation. Our results show that the OAM spectrum of a TGSM beam changes with the beam propagating in turbulent atmosphere, which is completely different from that of the TGSM beam propagating in free space. Furthermore, influences of the source parameters and the turbulence parameters on the OAM spectrum of a TGSM beam in turbulent atmosphere are analyzed. It is found that the source parameters and turbulence parameters, such as twist factor, coherence length, beam waist size, and structure constant, have a significant influence on the OAM spectrum, but the value of the wavelength and inner scale have little influence. Increasing the beam waist size or decreasing the coherence length would lead to the OAM spectrum broadened in the source plane, but would be robust for the OAM modes of the TGSM beam in the turbulent atmosphere. It is dear that the bigger the value of the twist factor, the more asymmetric the OAM mode of the TGSM beam is, and the better mode distribution can be maintained when it propagates in turbulent atmosphere. Our results have potential applications in reducing the error rate of free-space optical communication and detecting the atmospheric parameters. (C) 2019 Optical Society of America
Accession Number: WOS:000510847300017
PubMed ID: 32118891
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Fan, Weichen    0000-0003-0041-955X 
ISSN: 1084-7529
eISSN: 1520-8532

Record 23 of 333
Title: Triphoton correlations in six-wave mixing
Author(s): Zhang, SQ (Zhang, Siqiang); Li, W (Li, Wei); Li, KK (Li, Kangkang); Li, YM (Li, Yameng); Mu, F (Mu, Fan); Feng, Y (Feng, Yuan); Liu, Y (Liu, Yang); Zhang, YP (Zhang, Yanpeng)
Source: ANNALS OF PHYSICS  Volume: 412  Article Number: 168000  DOI: 10.1016/j.aop.2019.168000  Published: JAN 2020  
Abstract: The generation of nonclassical multiphoton has aroused and renewed interest in recent years. Here, we theoretically propose a new method to generate a temporal triplet correlation via a spontaneous six-wave mixing process. In the dressed-state picture at atomic ensemble, we forecast two or more different resonant dispersion modes of each generated photons. With energy conservation condition, these resonant dispersion modes compose multiple six-wave mixing processes, and the different processes could beat with each other. When we only consider the nonlinear optical response, the coincidence counts of triplets perform as a damped Rabi oscillation (three conditional two-photon correlations with four or six periods) because of the destructive interference among the possible six-wave mixing processes. The coherent time in the system is determined by the effective dephasing rate. Furthermore, we study the triphoton correlation with the fifth-order nonlinear susceptibility and the phase matchings mixing. (C) 2019 Elsevier Inc. All rights reserved.
Accession Number: WOS:000509419600019
ISSN: 0003-4916
eISSN: 1096-035X

Record 24 of 333
Title: Sparse spectral signal reconstruction for one proposed nine-band multispectral imaging system
Author(s): Sun, BY (Sun, Bangyong); Zhao, Z (Zhao, Zhe); Xie, DH (Xie, Dehong); Yuan, NZ (Yuan, Nianzeng); Yu, Z (Yu, Zhe); Chen, F (Chen, Fuwei); Cao, CJ (Cao, Congjun); de Dravo, VW (de Dravo, Vincent Whannou)
Source: MECHANICAL SYSTEMS AND SIGNAL PROCESSING  Volume: 141  Article Number: 106627  DOI: 10.1016/j.ymssp.2020.106627  Published: JUL 2020  
Abstract: Multispectral filter array (MSFA) imaging with one single sensor is a portable and inexpensive means of acquiring spectral image which is widely used for object detection, material analysis and mechanical system diagnosis. The most challenging task for MSFA imaging is the multispectral demosaicking with the aim of reconstructing the captured raw/mosaic image, especially for the systems with many bands which result in higher sparseness of the raw data. In this paper, we present a 9-band MSFA imaging system in a repetitive 4 x 4 filter array on a single sensor, and propose a demosaicking algorithm for reconstructing the raw spectral image. Within the 4 x 4 MSFA pattern, the fifth spectral band takes up half of the total spatial position while the remaining eight bands occupy 1/16 respectively. To reconstruct the sparse raw data, we first recover the fifth band by propagating the neighboring sampled pixels to the unsampled position using the image gradients, and then employ the reconstructed fifth band as a guided image to demosaick the other bands with the guided filter and residual interpolation. Finally, we estimate the spectral reflectance values from the multispectral image and the characterization matrix. In the experiment, we evaluate the performance of the 9-band imaging system with the binary tree-based edge-sensing (BTES) algorithm, compressed sensing (CS) algorithm, and our proposed demosaicking algorithm. The experiment results demonstrate that our demosaicking algorithm not only outperforms BTES and CS algorithms in terms of objective image quality, e.g., PSNR values and spectral errors, but also reduces the demosaicking artifacts in terms of subjective evaluations. (C) 2020 Elsevier Ltd. All rights reserved.
Accession Number: WOS:000529084500024
ISSN: 0888-3270

Record 25 of 333
Title: Tunable Electromagnetically Induced Transparency-Like Spectrum in Lithium Niobate on Insulator Platform With Narrow Linewidth
Author(s): Yu, WQ (Yu, Wenqi); Dai, SX (Dai, Shuangxing); Zhao, YR (Zhao, Yiru); Zhao, QF (Zhao, Qinfeng); Li, JY (Li, Jinye); Liu, JG (Liu, Jianguo)
Source: IEEE PHOTONICS JOURNAL  Volume: 12  Issue: 5  Article Number: 2700308  DOI: 10.1109/JPHOT.2020.3025626  Published: OCT 2020  
Abstract: An all-pass racetrack-resonator-Bragg gratings (APRR-BG) on thin-film lithium niobate on insulator (LNOI) based coupling resonant system is proposed to generate tunable electromagnetically induced transparency (EIT)-like transmission. The structure is a normal all-pass racetrack-resonator with two Bragg gratings inscribed within the straight waveguides, which introduces two different optical pathways in essence, inducing EIT-like spectrum as a result. We investigate the linewidth, and tunability of the EIT-like spectrum, and manufacturing tolerance of the resonant system by utilising the transfer matrix method. The simulation results indicate an extremely narrow linewidth of several picometers, and a high voltage sensitivity of 0.338 GHz/V@1550 nm, which indicates potential for optical filter, optical switching, and sensing of the system.
Accession Number: WOS:000579383900003
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Zhao, Qinfeng    0000-0001-8435-409X 
ISSN: 1943-0655
eISSN: 1943-0647

Record 1 of 333
Title: All-fiber phase shifter based on hollow fiber interferometer integrated with Au nanorods
Author(s): Luo, M (Luo, Meng); Yang, XH (Yang, Xinghua); Teng, PP (Teng, Pingping); Liu, ZH (Liu, Zhihai); Kong, DP (Kong, Depeng); Zhang, JZ (Zhang, Jianzhong); Yang, J (Yang, Jun); Tian, FJ (Tian, Fengjun); Gao, DH (Gao, Danheng); Li, ZN (Li, Zhanao); Yuan, LB (Yuan, Libo); Li, K (Li, Kang); Copner, N (Copner, Nigel)
Source: SENSORS AND ACTUATORS A-PHYSICAL  Volume: 301  Article Number: 111750  DOI: 10.1016/j.sna.2019.111750  Published: JAN 2020  
Abstract: We propose and demonstrate a novel all-fiber phase shifter by integrating a microstructured hollow fiber (MHF) and gold nanorods (GNRs) with photothermal effect. There are two cores and a central hole in the MHF. One core is suspended on the inner surface of the central hole, which serves as the sensing arm. The other one located in the cladding is as the reference arm. A Mach-Zehnder interferometer (MZI) can be fabricated simply through splicing multimode fiber-single mode fiber structures at both ends of the MHF. In this device, the center hole of MHF is filled with the solution of GNRs. The GNRs around the sensing arm is excited by near infrared light in the core via the evanescent interaction and the released heat because of the photothermal effect. Then, the refractive index around the sensing arm is modulated and the interference dips can be reversibly shifted. Experimental results show that spectral shift efficiency about -37.5 pm/mW near 1560 nm can be obtained under an excitation laser at the wavelength of 805 nm. This all-optical device based on MHF and GNRs has great potentials in integrated all-fiber signal controlling. (C) 2019 Elsevier B.V. All rights reserved.
Accession Number: WOS:000514215300025
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Yang, jun  G-4446-2014  0000-0002-6805-4289 
ISSN: 0924-4247

Record 2 of 333
Title: Simulation of magnetic field effects on the MCP gain
Author(s): Li, L (Li, L.); Guo, L (Guo, L.); Wei, Y (Wei, Y.); Sai, X (Sai, X.); Liu, H (Liu, H.); He, K (He, K.); Gou, Y (Gou, Y.); Liu, B (Liu, B.); Tian, J (Tian, J.); Chen, P (Chen, P.)
Source: JOURNAL OF INSTRUMENTATION  Volume: 15  Issue: 3  Article Number: C03048  DOI: 10.1088/1748-0221/15/03/C03048  Published: MAR 2020  
Abstract: A multi-anode microchannel plate photomultiplier (Ma MCP-PMT) is an appropriate photo sensor for particle identification in high energy physics experiments such as PANDA, Belle II, etc. Since these detectors usually work in a strong magnetic field, the sensors must be immune to the field. In this article, the effects of the magnetic field on the conventional MCP and the atomic layer deposited MCP (ALD-MCP) are studied by simulating the electron multiplication in the microchannel of the MCP. Simulation results show that the gain of conventional MCP-PMTs increases a little before it starts decreasing while the magnetic field is further increasing. We found that the shortening of electronic trajectories and the reduction of secondary electrons mainly contribute to gain variations of a conventional MCP. For the ALD-MCP that usually has higher secondary emission yields, it is found that high re-diffusion secondary electron yields could make it more vulnerable to magnetic fields.
Accession Number: WOS:000528039600048
Conference Title: International Workshop on Fast Cherenkov Detectors - Photon Detection, DIRC Design and DAQ
Conference Date: SEP 11-13, 2019
Conference Location: Giessen, GERMANY
ISSN: 1748-0221

Record 3 of 333
Title: Automatic Process Parameters Tuning and Surface Roughness Estimation for Laser Cleaning
Author(s): Liu, HT (Liu, Haoting); Li, JC (Li, Jiacheng); Yang, Y (Yang, Yong); Lan, JH (Lan, Jinhui); Xue, YF (Xue, Yafei)
Source: IEEE ACCESS  Volume: 8  Pages: 20904-20919  DOI: 10.1109/ACCESS.2020.2970086  Published: 2020  
Abstract: An image analysis-based two-stage process parameters tuning and Surface Roughness (SR) estimation algorithm is proposed for the laser cleaning application. A Cartesian coordinate robot is utilized to collect image and implement cleaning. Before cleaning, in order to tune the proper laser parameters, first, the environment lighting is controlled for the metal image collection. Second, lots of classification features are computed for the images above. The Gray-Level Co-occurrence Matrix (GLCM) texture features, the concavo-convex region features, the histogram symmetry difference feature, and the imaging thermophysical property features are computed. Third, the initial laser parameters are created randomly and an iteration computation is performed: a Support Vector Machine (SVM) is used to forecast the cleaning effect; its inputs include the classification features and the initial laser parameters; its output is the cleaning effect degree. If the SVM output cannot fulfill user's demand, the laser parameters will be updated randomly. This iteration will be implemented constantly until the SVM output becomes valid. Then the laser cleaning will be performed. When estimating SR for the cleaned metal, multiple image features are calculated for the images after cleaning. The features include the Tamura coarseness, some GLCM features, and the convex region feature. To improve the prediction precision, different feature combinations are used for different cleaning effects. The linear function and the 3-order polynomial function are considered for the SR estimation. After tests, the accuracies of SVM, the SR prediction function, and the integrated SR control and estimation algorithm can be 90.0%, 80.0% and 80.0% approximately.
Accession Number: WOS:000525391900026
ISSN: 2169-3536

Record 4 of 333
Title: Fabrication of hollow polymer microstructures using dielectric and capillary forces
Author(s): Tonry, CEH (Tonry, Catherine E. H.); Patel, MK (Patel, Mayur K.); Yu, WX (Yu, Weixing); Desmulliez, MPY (Desmulliez, Marc P. Y.); Bailey, C (Bailey, Christopher)
Source: MICROSYSTEM TECHNOLOGIES-MICRO-AND NANOSYSTEMS-INFORMATION STORAGE AND PROCESSING SYSTEMS  Volume: 26  Issue: 2  Pages: 301-308  DOI: 10.1007/s00542-019-04409-z  Published: FEB 2020  
Abstract: Electric Field Assisted Capillarity is a novel one-step process suitable for the fabrication of hollow polymer microstructures. The process, demonstrated to work experimentally on a microscale using Polydimethylsiloxane (PDMS), makes use of both the electrohydrodynamics of polymers subject to an applied voltage and the capillary force on the polymers caused by a low contact angle on a heavily wetted surface. Results of two-dimensional numerical simulations of the process are discussed in this paper for the special case of production of microfluidic channels. The paper investigates the effects of altering key parameters including the contact angle with the top mask, the polymer thickness and air gap, the permittivity of the polymer, the applied voltage and geometrical variations on the final morphology of the microstructure. The results from these simulations demonstrate that the capillary force caused by the contact angle has the greatest effect on the final shape of the polymer microstructures.
Accession Number: WOS:000511470900002
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Yu, Weixing  G-3658-2012  0000-0002-3216-526X 
Tonry, Catherine    0000-0002-8214-0845 
ISSN: 0946-7076
eISSN: 1432-1858

Record 5 of 333
Title: Space Debris Detection Using Feature Learning of Candidate Regions in Optical Image Sequences
Author(s): Xi, JB (Xi, Jiangbo); Xiang, YB (Xiang, Yaobing); Ersoy, OK (Ersoy, Okan K.); Cong, M (Cong, Ming); Wei, X (Wei, Xin); Gu, JK (Gu, Junkai)
Source: IEEE ACCESS  Volume: 8  Pages: 150864-150877  DOI: 10.1109/ACCESS.2020.3016761  Published: 2020  
Abstract: Space debris detection is important in space situation awareness and space asset protection. In this article, we propose a method to detect space debris using feature learning of candidate regions. The acquired optical image sequences are first processed to remove hot pixels and flicker noise, and the nonuniform background information is removed by the proposed one dimensional mean iteration method. Then, the feature learning of candidate regions (FLCR) method is proposed to extract the candidate regions and to detect space debris. The candidate regions of space debris are precisely extracted, and then classified by a trained deep learning network. The feature learning model is trained using a large number of simulated space debris with different signal to noise ratios (SNRs) and motion parameters, instead of using real space debris, which make it difficult to extract a sufficient number of real space debris with diverse parameters in optical image sequences. Finally, the candidate regions are precisely placed in the optical image sequences. The experiment is performed using the simulated data and acquired image sequences. The results show that the proposed method has good performance when estimating and removing background, and it can detect low SNR space debris with high detection probability.
Accession Number: WOS:000567056500001
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Xi, Jiangbo    0000-0003-2258-0993 
XIANG, Yaobing    0000-0002-2874-7486 
ISSN: 2169-3536

Record 6 of 333
Title: Investigations on Average Fluorescence Lifetimes for Visualizing Multi-Exponential Decays
Author(s): Li, YH (Li, Yahui); Natakorn, S (Natakorn, Sapermsap); Chen, Y (Chen, Yu); Safar, M (Safar, Mohammed); Cunningham, M (Cunningham, Margaret); Tian, JS (Tian, Jinshou); Li, DDU (Li, David Day-Uei)
Source: FRONTIERS IN PHYSICS  Volume: 8  Article Number: 576862  DOI: 10.3389/fphy.2020.576862  Published: OCT 16 2020  
Abstract: Intensity- and amplitude-weighted average lifetimes, denoted as tau(I) and tau(A) hereafter, are useful indicators for revealing Forster resonance energy transfer (FRET) or fluorescence quenching behaviors. In this work, we discussed the differences between tau(I) and tau(A) and presented several model-free lifetime determination algorithms (LDA), including the center-of-mass, phasor, and integral equation methods for fast tau(I) and tau(A) estimations. For model-based LDAs, we discussed the model-mismatch problems, and the results suggest that a bi-exponential model can well approximate a signal following a multi-exponential model. Depending on the application requirements, suggestions about the LDAs to be used are given. The instrument responses of the imaging systems were included in the analysis. We explained why only using the tau(I) model for FRET analysis can be misleading; both tau(I) and tau(A) models should be considered. We also proposed using tau(A)/tau(I) as a new indicator on two-photon fluorescence lifetime images, and the results show that tau(A)/tau(I) is an intuitive tool for visualizing multi-exponential decays.
Accession Number: WOS:000584706400001
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
SAFAR, MOHAMMED    0000-0003-0991-2973 
Cunningham, Margaret    0000-0001-6454-8671 
ISSN: 2296-424X

Record 7 of 333
Title: The phase transitions and magnetocaloric effects in Ga-doped Heusler Ni50Mn36Sn14 alloys
Author(s): Cao, KY (Cao, Kaiyan); Wang, DC (Wang, Dingchen); Tian, FH (Tian, Fanghua); Zhao, QZ (Zhao, Qizhong); Chang, TY (Chang, Tieyan); Zhang, HS (Zhang, Haosu); Zhou, C (Zhou, Chao); Zuo, WL (Zuo, Wenliang); Yang, S (Yang, Sen); Song, XP (Song, Xiaoping); Zhang, Y (Zhang, Yin)
Source: JAPANESE JOURNAL OF APPLIED PHYSICS  Volume: 59  Issue: 1  Article Number: 010905  DOI: 10.7567/1347-4065/ab5c59  Published: JAN 1 2020  
Abstract: Recent investigations in the magnetocaloric effect mainly focus on the discovery of new materials exhibiting large refrigeration capacity, tuneable working temperature and negligible hysteresis. In this context, different magnetic phase transitions of Ni50Mn36GaxSn14-x (0 <= x <= 14) ferromagnetic shape memory alloys have been systematically investigated and the phase diagram with morphotropic phase boundary (MPB) was drawn accordingly. In particular, magnetocaloric effects were calculated and compared in the vicinity of Curie transition, martensitic transition and MPB, respectively. As a result, the magnetocaloric effect of the Ni50Mn36Ga5Sn9 alloy has a wide working temperature range and zero thermal hysteresis at the MPB compared to the effect occurring at other transitions, and the effective refrigeration capacity could reach a compared value 96 J kg(-1) in this case. (C) 2019 The Japan Society of Applied Physics
Accession Number: WOS:000566404300005
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Dingchen, Wang    0000-0003-3747-1626 
ISSN: 0021-4922
eISSN: 1347-4065

Record 8 of 333
Title: A Wavelength Tunable CW Orange-red Laser Source Based on Magnesium Oxide-doped Periodically-poled LiNbO3 in an Intracavity Sum-frequency Generation
Author(s): Bai, Y (Bai, Yang); Li, JL (Li, Jianlin); Lei, GZ (Lei, Guangzhi); Hou, L (Hou, Lei); Zha, RW (Zha, Rongwei); Wang, Y (Wang, Yi); Chen, HW (Chen, Haowei)
Source: MATERIALS SCIENCE-MEDZIAGOTYRA  Volume: 26  Issue: 4  Pages: 381-386  DOI: 10.5755/j01.ms.26.4.22640  Published: 2020  
Abstract: A watt-level continuous wave (CW) orange-red laser with wavelength tunable properties is experimentally implemented based on sum-frequency generation (SFG) in a composite cavity. The cavity is composed of an 880 nm laser diode (LD) side-pumped Nd: GdVO4 p-polarized 1062.9 nm cavity and a single-resonant optical parametric oscillator (SRO) of signal light using a magnesium oxide-doped periodically-poled LiNbO3 (MgO: PPLN) crystal with a poling period of 29.1 nm. In the overlap region of the two cavities, orange-red laser is generated by using a type-II critical phase-matched potassium titanyl phosphate crystal (KTP) crystal. In the temperature tuning range of the MgO: PPLN crystal (from 30 degrees C to 200 degrees C), the CW orange-red laser beams are generated in a tunable waveband from 612.24 nm to 620.72 nm (Delta lambda = 8.48 nm), corresponding to the mid-infrared idler light is also obtained with tunable wavelength from 4027.5 nm to 3708.2 nm (Delta lambda = 319.3 nm). At the lowest tuning temperature of 30 degrees C, the maximum CW output power of the orange-red laser at 612.24 nm and the idler light at 4027.5 nm are obtained, which are 1.145 W and 2.83 W, respectively.
Accession Number: WOS:000561119800001
ISSN: 1392-1320
eISSN: 2029-7289

Record 9 of 333
Title: High-power tunable sub-nm narrowband near-diffraction-limited superfluorescent fiber source based on a single-lens spectral filter
Author(s): Gao, W (Gao, Wei); Fan, WH (Fan, Wenhui); Zhang, YP (Zhang, Yanpeng); Ju, P (Ju, Pei); Zhao, BY (Zhao, Baoyin); Wu, P (Wu, Peng); Li, G (Li, Gang); Gao, Q (Gao, Qi); Li, Z (Li, Zhe)
Source: OPTICS COMMUNICATIONS  Volume: 463  Article Number: 125359  DOI: 10.1016/j.optcom.2020.125359  Published: MAY 15 2020  
Abstract: We propose a method for a high-power tunable sub-nm narrowband near-diffraction-limited superfluorescent fiber source (SFS) based on a single-lens spectral filter (SLSF), which is composed of a grating monochromator and a movable space-fiber coupler. The center wavelength of the SLSF is set to 1063 nm with a full width at half-maximum (FWHM) linewidth of less than 0.08 nm. By utilizing the SLSF and a broadband amplified SFS, a tunable sub-nm narrowband SFS seed source is obtained, and the central wavelength of the sub-nm narrowband SFS seed source can be easily tuned from 1052.4 nm to 1072.8 nm by adjusting the SLSF. After a three-stage amplifier system, the output power of this sub-nm narrowband SFS is boosted to 230W with the FWHM range from 0.10 nm to 0.12 nm. The beam quality factors (M-2) of the full power sub-nm narrowband SFS at 1060.1 nm is 1.20. The proposed tunable sub-nm SFS has advantages of high spectral resolution, simple configuration, which may have potential applications in the industrial production and scientific research.
Accession Number: WOS:000520479100020
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Gao, Wei    0000-0001-8984-4805 
ISSN: 0030-4018
eISSN: 1873-0310

Record 10 of 333
Title: Under-oil self-driven and directional transport of water on a femtosecond laser-processed superhydrophilic geometry-gradient structure
Author(s): Wu, JR (Wu, Junrui); Yin, K (Yin, Kai); Li, LM (Li, Ming); Wu, ZP (Wu, Zhipeng); Xiao, S (Xiao, Si); Wang, H (Wang, Hua); Duan, JA (Duan, Ji-An); He, J (He, Jun)
Source: NANOSCALE  Volume: 12  Issue: 6  Pages: 4077-4084  DOI: 10.1039/c9nr09902f  Published: FEB 14 2020  
Abstract: Self-driven and continuous directional transport of water droplets in an oil environment has great potential applications in microfluidics, oil-water separation, etc. Nevertheless, most current studies exploit water behaviors occurring in air, and the directional regulation of water in a viscous oil medium remains a challenge. In this work, a superhydrophilic geometry-gradient stainless steel platform with nanoparticle-covered nanoripple structures is proposed using femtosecond laser direct writing technology. The as-prepared platform spontaneously and directionally transported water droplets in the oil environment from the minor side to the large side of the trapezoidal platform surface, but not in the opposite direction. The transport velocity of water droplets as a function of trapezoid angle and tilt angle of the as-prepared platform was investigated in detail. In addition, a pumpless under-oil water transport platform was successfully prepared on other substrates including Ti and Ni sheets, polyimide film, and C cloth, and exhibited transport capabilities when the platform was flexed and combined into various shapes. This work offers insight into the simple fabrication of a flexible and substrate-independent pumpless under-oil directional transport device for water.
Accession Number: WOS:000515391000052
PubMed ID: 32022050
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
HE, Jun  C-5197-2008  0000-0002-1479-285X 
Yin, Kai  S-9883-2017  0000-0002-0763-3834 
Xiao, Si    0000-0002-7172-3607 
ISSN: 2040-3364
eISSN: 2040-3372

Record 11 of 333
Title: RETRACTION: Retracted:Non-crystalline YVO(4)fiber (Retraction of Vol 0, Pg 1, 2019)
Author(s): Lan, BJ (Lan, Bijiao); Yu, YZ (Yu, Yongze); Xiao, XS (Xiao, Xusheng); Feng, X (Feng, Xu); Tang, JZ (Tang, Junzhou); Guo, HT (Guo, Haitao); Wu, ZP (Wu, Zhenping); Zhou, SF (Zhou, Shifeng)
Source: JOURNAL OF THE AMERICAN CERAMIC SOCIETY  Volume: 103  Issue: 8  DOI: 10.1111/jace.16350  Published: AUG 2020  
Accession Number: WOS:000543493000069
ISSN: 0002-7820
eISSN: 1551-2916

Record 12 of 333
Title: Photonic RF Phase-Encoded Signal Generation With a Microcomb Source
Author(s): Xu, XY (Xu, Xingyuan); Tan, MX (Tan, Mengxi); Wu, J (Wu, Jiang); Boes, A (Boes, Andreas); Corcoran, B (Corcoran, Bill); Nguyen, TG (Nguyen, Thach G.); Chu, ST (Chu, Sai T.); Little, BE (Little, Brent E.); Morandotti, R (Morandotti, Roberto); Mitchell, A (Mitchell, Arnan); Moss, D (Moss, David)
Source: JOURNAL OF LIGHTWAVE TECHNOLOGY  Volume: 38  Issue: 7  Pages: 1722-1727  DOI: 10.1109/JLT.2019.2958564  Published: APR 1 2020  
Abstract: We demonstrate photonic RF phase encoding based on an integrated micro-comb source. By assembling single-cycle Gaussian pulse replicas using a transversal filtering structure, phase encoded waveforms can be generated by programming the weights of the wavelength channels. This approach eliminates the need for RF signal generators for RF carrier generation or arbitrary waveform generators for phase encoded signal generation. A large number of wavelengths-up to 60-were provided by the microcomb source, yielding a high pulse compression ratio of 30. Reconfigurable phase encoding rates ranging from 2 to 6 Gb/s were achieved by adjusting the length of each phase code. This article demonstrates the significant potentials of this microcomb-based approach to achieve high-speed RF photonic phase encoding with low cost and footprint.
Accession Number: WOS:000528516300014
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Morandotti, Roberto  AAU-4702-2020   
Xu, Xingyuan  AAL-3295-2021   
Corcoran, Bill  AAQ-6585-2020   
Boes, Andreas  N-4462-2019  0000-0001-8443-3396 
Chu, Sai T  D-3312-2014  0000-0001-8263-8507 
Mitchell, Arnan  C-5017-2008  0000-0002-2463-2956 
Morandotti, Roberto  J-7954-2013  0000-0001-7717-1519 
Nguyen, Thach    0000-0002-8409-5638 
ISSN: 0733-8724
eISSN: 1558-2213

Record 13 of 333
Title: Physical and Mechanical Characteristics of Lunar Soil at the Chang'E-4 Landing Site
Author(s): Tang, ZC (Tang, Zhencheng); Liu, JJ (Liu, Jianjun); Wang, X (Wang, Xing); Ren, X (Ren, Xin); Chen, WL (Chen, Wangli); Yan, W (Yan, Wei); Zhang, XX (Zhang, Xiaoxia); Tan, X (Tan, Xu); Zeng, XG (Zeng, Xingguo); Liu, DW (Liu, Dawei); Zhang, HB (Zhang, Hongbo); Wen, WB (Wen, Weibin); Zuo, W (Zuo, Wei); Su, Y (Su, Yan); Yang, JF (Yang, Jianfeng); Li, CL (Li, Chunlai)
Source: GEOPHYSICAL RESEARCH LETTERS  Volume: 47  Issue: 22  Article Number: e2020GL089499  DOI: 10.1029/2020GL089499  Published: NOV 28 2020  
Abstract: Chang'E-4, with the Yutu-2 rover, is the first lunar probe to successfully land and conduct a tour on the far side of the Moon from early 2019. We analyze the physical and mechanical characteristics of lunar soil through the in situ terrain data collected by the panoramic camera onboard the Yutu-2 rover. With the slip ratio and wheel sinkage obtained by the derived Digital Orthophoto Map (DOM) and Digital Elevation Model (DEM), the mechanical parameters of lunar soil are derived from the slip-sinkage model. These mechanical parameters and wheel size of the rover are used to obtain the pressure-sinkage curves, which can estimate the lunar soil strength. The experimental results indicate that the soil strength at the Chang'E-4 landing site is much higher than that at the Chang'E-3 landing site. The discrepancies in lunar soil strength between the two landing sites may be related to the local surface topography and degree of space weathering.
Plain Language Summary The knowledge of the physical and mechanical characteristics of lunar soil is of fundamental importance because it is the basis for mineral resource exploration and engineering activity aimed at the construction of lunar bases. The Chang'E-4 landing site is within the mare floor of the Von Karman crater inside the South Pole-Aitken (SPA) basin. The ejecta from the nearby impact craters has covered the Chang'E-4 landing area. Besides, the lunar soil of the Chang'E-4 landing area has been relatively mature. Here, a method of analyzing the characteristics of lunar soil is introduced to provide an opportunity to understand the physical and mechanical properties of the mature lunar soil at the Chang'E-4 landing site. With the terrain data collected by the panoramic camera onboard the Yutu-2 rover, we can get the relationship curve of the interaction between the rover wheels and lunar soil, such as the pressure-sinkage curve. The pressure-sinkage curves can intuitively reflect the discrepancies of lunar soil strength at the Chang'E-4 and Chang'E-3 landing sites, which may bear a big relationship to the local surface morphology and degree of space weathering.
Accession Number: WOS:000595819700097
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Wang, Xing    0000-0001-7428-2360 
Tang, ZhenCheng    0000-0001-6690-9004 
Liu, Jianjun    0000-0002-9328-6532 
ISSN: 0094-8276
eISSN: 1944-8007

Record 14 of 333
Title: Spiculation Sign Recognition in a Pulmonary Nodule Based on Spiking Neural P Systems
Author(s): Qiu, S (Qiu, Shi); Sun, JT (Sun, Jingtao); Zhou, T (Zhou, Tao); Gao, GL (Gao, Guilong); He, ZN (He, Zhenan); Liang, T (Liang, Ting)
Source: BIOMED RESEARCH INTERNATIONAL  Volume: 2020  Article Number: 6619076  DOI: 10.1155/2020/6619076  Published: DEC 24 2020  
Abstract: The spiculation sign is one of the main signs to distinguish benign and malignant pulmonary nodules. In order to effectively extract the image feature of a pulmonary nodule for the spiculation sign distinguishment, a new spiculation sign recognition model is proposed based on the doctors' diagnosis process of pulmonary nodules. A maximum density projection model is established to fuse the local three-dimensional information into the two-dimensional image. The complete boundary of a pulmonary nodule is extracted by the improved Snake model, which can take full advantage of the parallel calculation of the Spike Neural P Systems to build a new neural network structure. In this paper, our experiments show that the proposed algorithm can accurately extract the boundary of a pulmonary nodule and effectively improve the recognition rate of the spiculation sign.
Accession Number: WOS:000607928500003
PubMed ID: 33426059
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Zhou, Tao  AAW-4180-2021   
ISSN: 2314-6133
eISSN: 2314-6141

Record 15 of 333
Title: OpenMRE: A Numerical Platform for MRE Study
Author(s): Li, BN (Li, Bing Nan); Shan, X (Shan, Xiang); Xiang, K (Xiang, Kui); Kobayashi, E (Kobayashi, Etsuko); Wang, M (Wang, Meng); Li, XL (Li, Xuelong)
Source: IEEE TRANSACTIONS ON SYSTEMS MAN CYBERNETICS-SYSTEMS  Volume: 50  Issue: 3  Pages: 1111-1121  DOI: 10.1109/TSMC.2017.2717481  Published: MAR 2020  
Abstract: Magnetic resonance elastography (MRE) offers a noninvasive solution to visualize the mechanical properties of soft tissue, but the study suffers from expensive magnetic resonance scanning. Moreover, translating MRE wave images into soft tissue elasticity is a nontrivial issue for clinical professionals and healthcare practitioners. An interactive system-OpenMRE-is thus developed with the aid of ImageJ for numerical MRE study. It is comprised of two comparatively independent toolkits, namely MREA for simulation and MREP for interpretation. MREA mainly deals with the forward problem of MRE, and provides a numerical platform to determine the propagation and distribution of specially designed elastic wave. It is possible to numerically study some state-of-the-art paradigms including multisource and multifrequency MRE. The resultant wave images are interpretable in MREP that is designed for the inverse problem of MRE. It consists of the algorithms for phase unwrapping, directional filtering, and elasticity reconstruction. In a word, OpenMRE offers the MRE community a convenient and well-functioning system for interactive MRE study.
Accession Number: WOS:000521966800031
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Kobayashi, Etsuko  ABA-5530-2020   
samani, Hooman  AAF-3524-2021  0000-0003-1494-2798 
Li, Xuelong  ABF-3381-2020   
Li, Bing Nan  A-4498-2009  0000-0002-4777-5773 
ISSN: 2168-2216
eISSN: 2168-2232

Record 16 of 333
Title: RF and Microwave Fractional Differentiator Based on Photonics
Author(s): Tan, MX (Tan, Mengxi); Xu, XY (Xu, Xingyuan); Corcoran, B (Corcoran, Bill); Wu, JY (Wu, Jiayang); Boes, A (Boes, Andreas); Nguyen, TG (Nguyen, Thach G.); Chu, ST (Chu, Sai T.); Little, BE (Little, Brent E.); Morandotti, R (Morandotti, Roberto); Mitchell, A (Mitchell, Arnan); Moss, DJ (Moss, David J.)
Source: IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS  Volume: 67  Issue: 11  Pages: 2767-2771  DOI: 10.1109/TCSII.2020.2965158  Published: NOV 2020  
Abstract: We report a photonic radio frequency (RF) fractional differentiator based on an integrated Kerr micro-comb source. The micro-comb source has a free spectral range (FSR) of 49 GHz, generating a large number of comb lines that serve as a high-performance multi-wavelength source for the differentiator. By programming and shaping the comb lines according to calculated tap weights, arbitrary fractional orders ranging from 0.15 to 0.90 are achieved over a broad RF operation bandwidth of 15.49 GHz. We experimentally characterize the frequency-domain RF amplitude and phase response as well as the temporal response with a Gaussian pulse input. The experimental results show good agreement with theory, confirming the effectiveness of our approach towards high-performance fractional differentiators featuring broad processing bandwidth, high reconfigurability, and potentially reduced sized and cost.
Accession Number: WOS:000604257500093
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Mitchell, Arnan  C-5017-2008  0000-0002-2463-2956 
Xu, Xingyuan  AAL-3295-2021   
Wu, Jiayang  Q-8590-2019  0000-0003-1115-610X 
Chu, Sai T  D-3312-2014  0000-0001-8263-8507 
Boes, Andreas  N-4462-2019  0000-0001-8443-3396