2024
2024
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Record 85 of
Title:Snapshot coherent diffraction imaging across ultra-broadband spectra
Author Full Names:Li, Boyang; Xiao, Zehua; Yuan, Hao; Huang, Pei; Cao, Huabao; Wang, Hushan; Zhao, Wei; Fu, YuxiSource Title:PHOTONICS RESEARCHLanguage:EnglishDocument Type:ArticleAbstract:Ultrafast imaging simultaneously pursuing high temporal and spatial resolution is a key technique to study the dynamics in the microscopic world. However, the broadband spectra of ultra-short pulses bring a major challenge to traditional coherent diffraction imaging (CDI), as they result in an indistinct diffraction pattern, thereby complicating image reconstruction. To address this, we introduce, to our knowledge, a new ultra- broadband coherent imaging method, and empirically demonstrate its efficacy in facilitating high-resolution and rapid image reconstruction of achromatic objects. The existing full bandwidth limitation for snapshot CDI is enhanced to ' 60% experimentally, restricted solely by our laser bandwidth. Simulations indicate the applicability of our method for CDI operations with a bandwidth as high as ' 140%, potentially supporting ultrafast imaging with temporal resolution into ' 50-attosecond scale. Even deployed with a comb-like harmonic spectrum encompassing multiple octaves, our method remains effective. Furthermore, we establish the capability of our approach in reconstructing a super-broadband spectrum for CDI applications with high fidelity. Given these advancements, we anticipate that our method will contribute significantly to attosecond imaging, thereby advancing cutting-edge applications in material science, quantum physics, and biological research. (c) 2024 Chinese Laser PressAddresses:[Li, Boyang; Xiao, Zehua; Yuan, Hao; Huang, Pei; Cao, Huabao; Wang, Hushan; Zhao, Wei; Fu, Yuxi] Chinese Acad Sci, Xian Inst Opt & Precis Mech, Ctr Attosecond Sci & Technol CAST, Xian 710119, Peoples R China; [Yuan, Hao; Cao, Huabao; Wang, Hushan; Fu, Yuxi] Univ Chinese Acad Sci, Beijing 100049, Peoples R ChinaAffiliations:Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CASPublication Year:2024Volume:12Issue:9Start Page:2068End Page:2077DOI Link:http://dx.doi.org/10.1364/PRJ.532957數(shù)據(jù)庫ID（收錄號）:WOS:001315448700006 -
Record 86 of
Title:SMALE: Hyperspectral Image Classification via Superpixels and Manifold Learning
Author Full Names:Liao, Nannan; Gong, Jianglei; Li, Wenxing; Li, Cheng; Zhang, Chaoyan; Guo, BaolongSource Title:REMOTE SENSINGLanguage:EnglishDocument Type:ArticleKeywords Plus:NONLINEAR DIMENSIONALITY REDUCTION; COMPONENT ANALYSIS; SEGMENTATIONAbstract:As an extremely efficient preprocessing tool, superpixels have become more and more popular in various computer vision tasks. Nevertheless, there are still several drawbacks in the application of hyperspectral image (HSl) processing. Firstly, it is difficult to directly apply superpixels because of the high dimension of HSl information. Secondly, existing superpixel algorithms cannot accurately classify the HSl objects due to multi-scale feature categorization. For the processing of high-dimensional problems, we use the principle of PCA to extract three principal components from numerous bands to form three-channel images. In this paper, a novel superpixel algorithm called Seed Extend by Entropy Density (SEED) is proposed to alleviate the seed point redundancy caused by the diversified content of HSl. It also focuses on breaking the dilemma of manually setting the number of superpixels to overcome the difficulty of classification imprecision caused by multi-scale targets. Next, a space-spectrum constraint model, termed Hyperspectral Image Classification via superpixels and manifold learning (SMALE), is designed, which integrates the proposed SEED to generate a dimensionality reduction framework. By making full use of spatial context information in the process of unsupervised dimension reduction, it could effectively improve the performance of HSl classification. Experimental results show that the proposed SEED could effectively promote the classification accuracy of HSI. Meanwhile, the integrated SMALE model outperforms existing algorithms on public datasets in terms of several quantitative metrics.Addresses:[Liao, Nannan; Gong, Jianglei; Li, Wenxing; Zhang, Chaoyan; Guo, Baolong] Xidian Univ, Inst Intelligent Control & Image Engn, Xian 710071, Peoples R China; [Gong, Jianglei] China Acad Space Technol, Beijing 100094, Peoples R China; [Li, Cheng] Chinese Acad Sci, Xi An Inst Opt & Precis Mech, Xian 710119, Peoples R ChinaAffiliations:Xidian University; Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CASPublication Year:2024Volume:16Issue:18Article Number:3442DOI Link:http://dx.doi.org/10.3390/rs16183442數(shù)據(jù)庫ID（收錄號）:WOS:001323359100001 -
Record 87 of
Title:Numerical simulation of dynamics behavior of pre-ionized pulsed-DC helium plasma jets at atmospheric pressure
Author Full Names:Liu, Yinghua; Yin, Peiqi; Xu, Boping; Liu, Dawei; Pi, Liangwen; Fu, Yuxi; Wang, Yishan; Zhao, Wei; Tang, JieSource Title:PHYSICS OF PLASMASLanguage:EnglishDocument Type:ArticleKeywords Plus:GLOW-DISCHARGE; GLIDING ARCAbstract:A two-dimensional axisymmetric fluid model was established to investigate the dynamic behavior of pre-ionized pulsed-direct-current helium plasma jets at atmospheric pressure. Our simulation results show that, at a relatively low pre-ionization level, the electron number density is reduced and the streamer propagation is decelerated before the plasma jet is ejected from the tube, which is attributed to the inhibitory effect of a recombination process between the positive ions in the streamer and the seed electrons near the anode. As the pre-ionization reaches a relatively high level, the electron number density is larger than that without pre-ionization before the plasma jet is ejected from the tube, which originates from the promotion effect of decreased breakdown voltage. These two competing mechanisms jointly dominate the dynamic behavior of gas discharge in the presence of pre-ionization. After the plasma jet is ejected from the tube, the enhanced discharge power is responsible for the strengthened electric field in the streamer head, augmented total ionization rate, accelerated streamer propagation, and increased number density of electrons and active species, whatever the pre-ionization density is. With the increase in pre-ionization density, the plasma jet length, streamer propagation speed, discharge power, and discharge energy exhibit the initial increase and subsequent decrease variation trend. The optimal enhancement effect is obtained at the pre-ionization density of 6 x 10(12) m(-3), with the plasma jet lengthened by 28.4% and the energy deposition efficiency enhanced by 28.1%. (c) 2024 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (Addresses:[Liu, Yinghua; Yin, Peiqi; Xu, Boping; Wang, Yishan; Zhao, Wei; Tang, Jie] Chinese Acad Sci, Xian Inst Opt & Precis Mech, State Key Lab Transient Opt & Photon, Shaanxi 710119, Peoples R China; [Liu, Yinghua; Yin, Peiqi; Xu, Boping; Pi, Liangwen; Fu, Yuxi; Wang, Yishan; Zhao, Wei; Tang, Jie] Univ Chinese Acad Sci, Beijing 100049, Peoples R China; [Liu, Dawei] Huazhong Univ Sci & Technol, State Key Lab Adv Electromagnet & Technol, Sch Elect & Elect Engn, Wuhan 430074, Hubei, Peoples R China; [Pi, Liangwen; Fu, Yuxi] Chinese Acad Sci, Xian Inst Opt & Precis Mech, Ctr Attosecond Sci & Technol, Xian 710119, Shaanxi, Peoples R ChinaAffiliations:Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Huazhong University of Science & Technology; Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CASPublication Year:2024Volume:31Issue:9Article Number:93506DOI Link:http://dx.doi.org/10.1063/5.0215614數(shù)據(jù)庫ID（收錄號）:WOS:001313858800007 -
Record 88 of
Title:Recent Advances in Applications of Ultrafast Lasers
Author Full Names:Niu, Sibo; Wang, Wenwen; Liu, Pan; Zhang, Yiheng; Zhao, Xiaoming; Li, Jibo; Xiao, Maosen; Wang, Yuzhi; Li, Jing; Shao, XiaopengSource Title:PHOTONICSLanguage:EnglishDocument Type:ReviewKeywords Plus:WHITE-LIGHT FILAMENTS; FEMTOSECOND LASER; WAVE-GUIDES; PULSED-LASER; SILICON SUBSTRATE; SYSTEM-DESIGN; FABRICATION; ABLATION; WRITTEN; HOLESAbstract:Ultrafast lasers, characterized by femtosecond and picosecond pulse durations, have revolutionized material processing due to their high energy density and minimal thermal diffusion, and have played a transformative role in precision manufacturing. This review first traces the progression from early ruby lasers to modern titanium-sapphire lasers, highlighting breakthroughs like Kerr-lens mode-locking and chirped pulse amplification. It also examines the interaction mechanisms between ultrafast pulses and various materials, including metals, dielectrics, and semiconductors. Applications of ultrafast lasers in microstructure processing techniques are detailed, such as drilling, cutting, surface ablation, and nano welding, demonstrating the versatility and precision of the technology. Additionally, it covers femtosecond laser direct writing for optical waveguides and the significant advancements in imaging and precision measurement. This review concludes by discussing potential future advancements and industrial applications of ultrafast lasers.Addresses:[Niu, Sibo; Zhao, Xiaoming; Li, Jibo; Wang, Yuzhi] Xidian Univ, Sch Optoelect Engn, Xian 710071, Peoples R China; [Niu, Sibo; Wang, Wenwen; Liu, Pan] China North Ind Grp Corp Ltd, Henan Pingyuan Opt Elect Co Ltd, Optoelect Grp, Jiaozuo 454000, Peoples R China; [Zhang, Yiheng] Xiamen Univ, Sch Aerosp Engn, Xiamen 361005, Peoples R China; [Xiao, Maosen; Shao, Xiaopeng] Chinese Acad Sci, Xian Inst Opt & Precis Mech, Xian 710119, Peoples R China; [Li, Jing] Xian Inst Appl Opt, Xian 710018, Peoples R ChinaAffiliations:Xidian University; Xiamen University; Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; Chinese Academy of SciencesPublication Year:2024Volume:11Issue:9Article Number:857DOI Link:http://dx.doi.org/10.3390/photonics11090857數(shù)據(jù)庫ID（收錄號）:WOS:001323749000001 -
Record 89 of
Title:A Survey on Vision-Based Anti Unmanned Aerial Vehicles Methods
Author Full Names:Wang, Bingshu; Li, Qiang; Mao, Qianchen; Wang, Jinbao; Chen, C. L. Philip; Shangguan, Aihong; Zhang, HaosuSource Title:DRONESLanguage:EnglishDocument Type:ReviewKeywords Plus:DRONE; TRANSFORMER; TRACKINGAbstract:The rapid development and widespread application of Unmanned Aerial Vehicles (UAV) have raised significant concerns about safety and privacy, thus requiring powerful anti-UAV systems. This survey provides an overview of anti-UAV detection and tracking methods in recent years. Firstly, we emphasize the key challenges of existing anti-UAV and delve into various detection and tracking methods. It is noteworthy that our study emphasizes the shift toward deep learning to enhance detection accuracy and tracking performance. Secondly, the survey organizes some public datasets, provides effective links, and discusses the characteristics and limitations of each dataset. Next, by analyzing current research trends, we have identified key areas of innovation, including the progress of deep learning techniques in real-time detection and tracking, multi-sensor fusion systems, and the automatic switching mechanisms that adapt to different conditions. Finally, this survey discusses the limitations and future research directions. This paper aims to deepen the understanding of innovations in anti-UAV detection and tracking methods. Hopefully our work can offer a valuable resource for researchers and practitioners involved in anti-UAV research.Addresses:[Wang, Bingshu; Li, Qiang; Mao, Qianchen] Northwestern Polytech Univ, Sch Software, Xian 710129, Peoples R China; [Wang, Bingshu; Wang, Jinbao] Shenzhen Univ, Natl Engn Lab Big Data Syst Comp Technol, Shenzhen 518060, Peoples R China; [Chen, C. L. Philip] South China Univ Technol, Sch Comp Sci & Engn, Guangzhou 510641, Peoples R China; [Chen, C. L. Philip] Pazhou Lab, Guangzhou 510335, Peoples R China; [Shangguan, Aihong; Zhang, Haosu] Chinese Acad Sci, Xian Inst Opt & Precis Mech, Xian 710119, Peoples R ChinaAffiliations:Northwestern Polytechnical University; Shenzhen University; South China University of Technology; Pazhou Lab; Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CASPublication Year:2024Volume:8Issue:9Article Number:518DOI Link:http://dx.doi.org/10.3390/drones8090518數(shù)據(jù)庫ID（收錄號）:WOS:001323475600001 -
Record 90 of
Title:A 4x112 Gb/s Ultra-Compact Polarization-Insensitive Silicon Photonics WDM Receiver With CMOS TIA for Co-Packaged Optics and Optical I/O
Author Full Names:Xue, Jintao; Wang, Binhao; Chen, Yihan; Chen, Sikai; Wu, Jinyi; Cheng, Chao; Bao, Shenlei; Qi, Nan; Zhang, WenfuSource Title:JOURNAL OF LIGHTWAVE TECHNOLOGYLanguage:EnglishDocument Type:ArticleKeywords Plus:GRATING COUPLER; CWDMAbstract:We present a four-channel polarization-insensitive silicon photonic (SiPh) wavelength division multiplexing (WDM) receiver, incorporating a polarization splitting grating coupler, dual-ring filters and bidirectional photodiodes. This design achieves an ultra-compact footprint of 1 mm x 0.2 mm with a polarization dependent loss (PDL) of 0.58 dB or less. Four clearly open eye diagrams at a data rate of 112 Gb/s PAM4 are obtained. Furthermore, we demonstrate the hybrid integration of the SiPh chip with a 28 nm CMOS transimpedence amplifier (TIA), resulting in an impressive energy efficiency of 1.34 pJ/bit at a data rate of 100 Gb/s PAM4. Sensitivities of -13.4 dBm and -5.6 dBm are achieved at data rates of 50 Gb/s NRZ and 100 Gb/s PAM4, respectively, under KP4 forward error correction (FEC) threshold.Addresses:[Xue, Jintao; Wang, Binhao; Wu, Jinyi; Cheng, Chao; Bao, Shenlei; Zhang, Wenfu] Chinese Acad Sci, Xian Inst Opt & Precis Mech, State Key Lab Transient Opt & Photon, Beijing 710119, Peoples R China; [Xue, Jintao; Wang, Binhao; Chen, Yihan; Chen, Sikai; Wu, Jinyi; Cheng, Chao; Bao, Shenlei; Qi, Nan; Zhang, Wenfu] Univ Chinese Acad Sci, Beijing 101408, Peoples R China; [Chen, Yihan; Chen, Sikai; Qi, Nan] Chinese Acad Sci, Inst Semicond, Beijing 100083, Peoples R ChinaAffiliations:Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Chinese Academy of Sciences; Institute of Semiconductors, CASPublication Year:2024Volume:42Issue:17Start Page:6028End Page:6035DOI Link:http://dx.doi.org/10.1109/JLT.2024.3402053數(shù)據(jù)庫ID（收錄號）:WOS:001297652400025 -
Record 91 of
Title:The Solar Aspect System of the Hard X-ray Imager Onboard ASO-S
Author Full Names:Yu, Jirui; He, Yinghong; Tao, Jinyou; Su, Yang; Zhang, Zhe; Yang, Jianfeng; Wang, Nange; Guo, Song; Lv, Baogang; Chen, Xiaobo; Xue, Bin; Hu, Yiming; Chen, Dengyi; Yu, Fu; Ding, Mingde; Ruan, PingSource Title:SOLAR PHYSICSLanguage:EnglishDocument Type:ArticleAbstract:The ASO-S/HXI is a bi-grids modulating instrument for solar hard X-ray imaging, whose collimator contains 91 pairs of tungsten grids. Since the solar disk is invisible in hard X-rays, a Solar Aspect System (SAS) is required to provide the pointing of hard X-ray imager (HXI) for locating X-ray sources on the solar disk. In addition, the knowledge of the alignment and relative twist of the corresponding front-rear grid pairs is important for image reconstruction as well as locating flares. Therefore, the SAS system was designed to monitor the alignment status of HXI grids and to provide the pointing direction of the HXI collimator with two subsystems DM and SA during the whole life cycle of HXI. DM measures the centroids of the front frosted glasses and the solar disk. SA images the Sun and provides precise relative locations of the solar disk center. Both work in the visible light of 565-585 nm. With all the data together, we can solve with an inversion algorithm the alignment status of the front and rear grids, the relative twist, and the pointing direction. We tested and validated the SAS design with both the simulation model and ground coordinate measuring machine. Here we present the detailed system design, the testing results, the inversion algorithm, and the in-orbit status of the SAS. Currently, the SAS has realized the rotational measurement accuracy of about 4 arcsec, and a translational measurement accuracy of about 15 mu m, and the SAS pointing data has been used in both imaging calibration for flare locations and imaging corrections for the platform drifting effect. The high-cadence precise measurement (better than 0.3 arcsec) of the pointing will allow the study of source locations at different energies and therefore help us to understand electron acceleration and transportation in flares.Addresses:[Yu, Jirui; He, Yinghong; Tao, Jinyou; Yang, Jianfeng; Wang, Nange; Guo, Song; Lv, Baogang; Chen, Xiaobo; Xue, Bin; Ruan, Ping] Chinese Acad Sci, Xian Inst Opt & Precis Mech, Xian 710119, Peoples R China; [Yu, Jirui] Univ Chinese Acad Sci, Beijing 100049, Peoples R China; [Su, Yang; Zhang, Zhe; Hu, Yiming; Chen, Dengyi; Yu, Fu] Chinese Acad Sci, Key Lab Dark Matter & Space Astron, Purple Mt Observ, Nanjing 210023, Peoples R China; [Su, Yang] Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Peoples R China; [Ding, Mingde] Nanjing Univ, Sch Astron & Space Sci, Nanjing 210023, Peoples R ChinaAffiliations:Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Purple Mountain Observatory, CAS; Chinese Academy of Sciences; Nanjing Institute of Astronomical Optics & Technology, NAOC, CAS; Chinese Academy of Sciences; University of Science & Technology of China, CAS; Nanjing UniversityPublication Year:2024Volume:299Issue:9Article Number:122DOI Link:http://dx.doi.org/10.1007/s11207-024-02366-z數(shù)據(jù)庫ID（收錄號）:WOS:001303226700001 -
Record 92 of
Title:Simultaneous transmission of multi-format signals in the mid-infrared over free space
Author Full Names:Su, Yulong; Xue, Jiayi; Zheng, Yunqiang; Wang, Wei; Tian, Wenlong; Zhu, JiangfengSource Title:OPTICS COMMUNICATIONSLanguage:EnglishDocument Type:ArticleKeywords Plus:2ND-HARMONIC GENERATION; WAVE; MODULES; FOGAbstract:Mid-infrared (MIR) light within the 3-5 mu m spectrum offers distinct advantages over the 1.5 mu m band, particularly in adverse atmospheric conditions, rendering it a favorable option for free-space optical (FSO) communication. The transmission capacity within the 3-5 mu m band is relatively low due to the immature state of its devices. In this study, we demonstrate multi-format signals FSO transmission with a total of 40 Gbps capacity in the 3 mu m band, utilizing our developed MIR transmitter and receiver modules. These modules facilitate wavelength conversion between the 1.5 mu m and 3 mu m bands through the utilization of difference-frequency generation (DFG) effect. The MIR transmitter effectively produces three MIR signals: On-Off Keying (OOK), Binary Phase Shift Keying (BPSK), and Quadrature Phase Shift Keying (QPSK) optical signals. The generated MIR power is 7.8 dBm, covering a wavelength range from 3.5864 to 3.5885 mu m. The MIR receiver regenerates the three format signals with a power of -29.6 dBm. Relevant results of regenerated signal demodulation have been collected in detail, including bit error ratio (BER), constellation diagram, and eye diagram. The required powers for the 10 Gbps OOK, BPSK, and QPSK are -37.82, -40.24, and -39.4 dBm at BER of 1 x 10(-6). It is expected to further push the data capacity to the terabit-per-second level by adding more 1.5 mu m band laser sources and using wider-bandwidth chirped nonlinear crystals.Addresses:[Su, Yulong; Xue, Jiayi; Zheng, Yunqiang; Tian, Wenlong; Zhu, Jiangfeng] Xidian Univ, Sch Optoelect Engn, Xian 710071, Peoples R China; [Zheng, Yunqiang; Wang, Wei] Chinese Acad Sci, Xian Inst Opt & Precis Mech XIOPM, State Key Lab Transient Opt & Photon, Xian 710119, Peoples R ChinaAffiliations:Xidian University; Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; State Key Laboratory of Transient Optics & PhotonicsPublication Year:2024Volume:573Article Number:131019DOI Link:http://dx.doi.org/10.1016/j.optcom.2024.131019數(shù)據(jù)庫ID（收錄號）:WOS:001317024400001 -
Record 93 of
Title:Upconversion photoluminescence of the lanthanide-doped core-shell luminescent material for anti-counterfeiting recognition
Author Full Names:Li, Dongdong; Zhang, Qianqian; Liao, Haibin; Fan, Qi; She, JiangboSource Title:OPTICS COMMUNICATIONSLanguage:EnglishDocument Type:ArticleKeywords Plus:NANOCRYSTALSAbstract:Three different NaErF4:Tm@NaREF4:Er (RE = Y, Lu, Yb) core-shell luminescent material were successfully synthesized. XRD, XPS and other characterization techniques were used to analyze the composed material, morphology, and luminous characteristics of the produced microparticles. Especially, compared with the uncoated NaErF4:Tm, the luminescence intensity of the materials with active-shell structure were increased by 2.44 times, 3.46 times, and 4.01 times respectively under 980 nm laser excitation. Moreover, the generated UCMPs were reliably employed for anti-counterfeiting recognition labels when they were used as screen-printing materials for anti-counterfeiting ink.Addresses:[Li, Dongdong; Zhang, Qianqian; Liao, Haibin] Xian Univ Posts & Telecommun, Sch Elect Engn, Xian 710121, Peoples R China; [Fan, Qi; She, Jiangbo] Chinese Acad Sci, Xian Inst Opt & Precis Mech, State Key Lab Transient Opt & Photon, Xian 710119, Peoples R ChinaAffiliations:Xi'an University of Posts & Telecommunications; State Key Laboratory of Transient Optics & Photonics; Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CASPublication Year:2024Volume:573Article Number:130987DOI Link:http://dx.doi.org/10.1016/j.optcom.2024.130987數(shù)據(jù)庫ID（收錄號）:WOS:001316929900001 -
Record 94 of
Title:Accurate two-step random phase retrieval approach without pre-filtering based on hyper ellipse fitting
Author Full Names:Li, Ziwen; Du, Hubing; Feng, Leijie; Gu, Feifei; Li, Yanjie; Zhu, Qian; Wei, Pengfei; Zhang, GaopengSource Title:OPTICS EXPRESSLanguage:EnglishDocument Type:ArticleKeywords Plus:GRAM-SCHMIDT ORTHONORMALIZATION; SHIFTING INTERFEROMETRY; FRINGE-PROJECTION; DEMODULATION; ALGORITHMAbstract:In this work, we propose a hyper ellipse fitting-based high-precision random two- frame phase shifting algorithm to improve the accuracy of phase retrieval. This method includes a process of Gram-Schmidt orthonormalization, followed by a hyper ellipse fitting procedure. The Gram-Schmidt orthonormalization algorithm constructs a quadrature fringe pattern relative to the original fringe pattern. These two quadrature fringe patterns are then fed into the hyper ellipse fitting procedure, which reconstructs the phase map and refines the background light to produce the final accurate phase of interest. Due to the hyper ellipse fitting procedure, the demodulation results are significantly improved in many cases. This method allows us to design a two-shot phase reconstruction algorithm without the need for least squares iteration or pre-filtering, effectively mitigating residual background to the greatest extent. It combines the advantages of both the Gram-Schmidt orthonormalization method and the Lissajous ellipse fitting method, making our hyper ellipse fitting approach a simple, flexible, and accurate phase retrieval algorithm. Experiments show that by using the weighted least squares method and adjusting the weights, this method can prioritize data points with more significant information or higher reliability, ensuring more accurate estimation of the ellipse parameters.Addresses:[Li, Ziwen; Du, Hubing; Feng, Leijie; Li, Yanjie; Zhu, Qian; Wei, Pengfei] Xian Technol Univ, Sch Mechatron Engn, Xian 710032, Shaanxi, Peoples R China; [Gu, Feifei] Chinese Acad Sci, Shenzhen Inst Adv Technol, Guangdong Hong Kong Macao Joint Lab Human Machine, Hong Kong 518055, Guangdong, Peoples R China; [Zhang, Gaopeng] Chinese Acad Sci, Xian Inst Opt & Precis Mech, Xian 710119, Peoples R ChinaAffiliations:Xi'an Technological University; Chinese Academy of Sciences; Shenzhen Institute of Advanced Technology, CAS; Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CASPublication Year:2024Volume:32Issue:18Start Page:31984End Page:32001DOI Link:http://dx.doi.org/10.1364/OE.533121數(shù)據(jù)庫ID（收錄號）:WOS:001305174600002 -
Record 95 of
Title:Highly sensitive Ga2O3 MSM solar-blind UV photodetector with impact ionization gain
Author Full Names:Wan, Qiyi; Zhang, Anzhen; Cao, Weiwei; Bai, Yonglin; Wang, Bo; Cheng, Hang; Wang, GangSource Title:OPTICS EXPRESSLanguage:EnglishDocument Type:ArticleKeywords Plus:THIN-FILM; TEMPERATURE; PERFORMANCE; SAPPHIRE; GROWTHAbstract:In this study, a (400) crystal-oriented beta-Ga2O3 thin film with a thickness of approximately 400 nm was grown on a c-plane sapphire substrate using atomic layer deposition. Schottky contact-type metal-semiconductor-metal solar-blind ultraviolet detectors with an Au/Ni/Ga2O3/Ni/Au structure were fabricated on the epitaxial thin films. The Schottky barrier height is about 1.1 eV. The device exhibited a high responsivity of up to 800 A/W, and a detectivity of 6 x 1014 Jones while maintaining a relatively fast response speed with a rise time of 4 ms and a fall time of 12 ms. The photo-to-dark current ratio was greater than 103, and the external quantum efficiency exceeded 103, indicating a significant gain in the device. Through the analysis of TCAD simulation and experimental results, it is determined that the impact ionization at the edge of the MSM electrode and channel contact is the main source of gain. Barrier tunneling effects and the photoconductive effect due to different carrier mobilities were not the primary reasons for the gain.Addresses:[Wan, Qiyi; Zhang, Anzhen; Cao, Weiwei; Bai, Yonglin; Wang, Bo; Cheng, Hang; Wang, Gang] Chinese Acad Sci, Key Lab Space Sci Low Light Level Detect Technol, Xian Inst Opt & Precis Mech XIOPM, Xian 710119, Shaanxi, Peoples R China; [Wan, Qiyi; Zhang, Anzhen; Bai, Yonglin; Wang, Bo; Cheng, Hang; Wang, Gang] Univ Chinese Acad Sci, Beijing 100049, Peoples R China; [Cao, Weiwei] Xi An Jiao Tong Univ, Key Lab Phys Elect & Devices, Minist Educ, Xian 710049, Peoples R China; [Cao, Weiwei] Xi An Jiao Tong Univ, Shaanxi Key Lab Informat Photon Tech, Xian 710049, Peoples R ChinaAffiliations:Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Xi'an Jiaotong University; Xi'an Jiaotong UniversityPublication Year:2024Volume:32Issue:18Start Page:32322End Page:32335DOI Link:http://dx.doi.org/10.1364/OE.531784數(shù)據(jù)庫ID（收錄號）:WOS:001304777600008 -
Record 96 of
Title:A novel demodulation method of the channeled modulated polarization imaging pictures by hybrid feature modulated autoencoders
Author Full Names:Zhang, Ning; Zhao, Mingfan; Zhang, Zhinan; Liu, Jie; Zhang, Yunyao; Li, SiyuanSource Title:OPTICS EXPRESSLanguage:EnglishDocument Type:ArticleKeywords Plus:SNAPSHOT; COMPACTAbstract:Channeled modulated polarization imaging technology offers advantages owing to its simple structure and low cost. However, the loss of high-frequency information due to channel crosstalk and the filter demodulation method has consistently hindered the mature application of this technology. We analyzed the data structure of pictures detected using this technology and proposed a demodulation method using hybrid feature modulated autoencoders. Training the network with a substantial number of images, it effectively addresses the issue of high-frequency information loss and demonstrates proficient demodulation capabilities for both simulated and real detected pictures. (c) 2024 Optica Publishing Group under the terms of the Optica Open Access Publishing AgreementAddresses:[Zhang, Ning; Zhao, Mingfan; Zhang, Zhinan; Liu, Jie; Li, Siyuan] Chinese Acad Sci, Xian Inst Opt & Precis Mech, Key Lab Spectral Imaging Technol, Xian 710119, Peoples R China; [Zhao, Mingfan] Sun Yat Sen Univ, Sch Integrated Circuits, Shenzhen 518107, Peoples R China; [Zhang, Yunyao] Northwest Univ, Coll Informat Sci & Technol, Xian 710126, Peoples R ChinaAffiliations:Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; Sun Yat Sen University; Northwest University Xi'anPublication Year:2024Volume:32Issue:18Start Page:31473End Page:31484DOI Link:http://dx.doi.org/10.1364/OE.530310數(shù)據(jù)庫ID（收錄號）:WOS:001306695500005