2024
2024
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Record 109 of
Title:Replica-assisted super-resolution fluorescence imaging in scattering media
Author Full Names:Wu, Tengfei(1,2); Baek, Yoonseok(1); Xia, Fei(1); Gigan, Sylvain(1); de Aguiar, Hilton B.(1)Source Title:arXivLanguage:EnglishDocument Type:Preprint (PP)Abstract:Far-field super-resolution fluorescence microscopy has been rapidly developed for applications ranging from cell biology to nanomaterials. However, it remains a significant challenge to achieve super-resolution imaging at depth in opaque materials. In this study, we present a super-resolution microscopy technique for imaging hidden fluorescent objects through scattering media, started by exploiting the inherent object replica generation arising from the memory effect, i.e. the seemingly informationless emission speckle can be regarded as a random superposition of multiple object copies. Inspired by the concept of super-resolution optical fluctuation imaging, we use temporally-fluctuating speckles to excite fluorescent signals and perform high-order cumulant analysis on the fluctuation, which can not only improve the image resolution, but also increase the speckle contrast to isolate only the bright object replicas. A super-resolved image can be finally retrieved by simply unmixing the sparsely distributed replicas with their location map. This methodology allows to overcome scattering and achieve robust super-resolution fluorescence imaging, circumventing the need of heavy computational steps. Copyright ? 2024, The Authors. All rights reserved.Affiliations:(1) Laboratoire Kastler Brossel, ENS- Université PSL, CNRS, Sorbonne Université, Collège de France. 24 rue Lhomond, Paris; 75005, France; (2) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, ChinaPublication Year:2024DOI Link:10.48550/arXiv.2404.19734數(shù)據(jù)庫ID（收錄號）:20240222956 -
Record 110 of
Title:Optimization design of cooling system stability of double crystal monochromator
Author Full Names:Jiang, Bo(1); Chu, Yuanbo(2); Guo, Yifan(2); Dong, Yiming(1)Source Title:Proceedings of SPIE - The International Society for Optical EngineeringLanguage:EnglishDocument Type:Conference article (CA)Conference Title:2024 International Conference on Frontiers of Applied Optics and Computer Engineering, AOCE 2024Conference Date:January 27, 2024 - January 28, 2024Conference Location:Kunming, ChinaConference Sponsor:Shandong University; Xinjiang UniversityAbstract:With the development of scientific research, the stability of synchrotron radiation has been paid more attention. The liquid vibration will change the liquid flow state, cause the vibration of the pipe surface, and lead to the crystal jitter. Aiming at the stability requirements of the high-stability monochromator of the partial beam line of SSRF, ANSYS workbench software was used to analyze and optimize the structure, and a cooling pipe system with more stable structure was designed. This paper also analyzes the effect of cooling system vibration on crystal. The test results of the prototype show that the resolution of the device can reach 1 urad and the repetition accuracy is less than 1.071 urad. All the indexes meet the needs of the monochromator. ? 2024 SPIE.Affiliations:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an, China; (2) School of Optoelectronics Engineering, Xi’an Technological University, Xi’an, ChinaPublication Year:2024Volume:13080Article Number:1308008DOI Link:10.1117/12.3025729數(shù)據(jù)庫ID（收錄號）:20241115749947 -
Record 111 of
Title:Research on the Disassembly Process of the Primary Mirror Components after the Deformation of the Glass-ceramic Primary Mirror
Author Full Names:Tao, Ren Wang(1); Peng, Wang(1)Source Title:Proceedings of SPIE - The International Society for Optical EngineeringLanguage:EnglishDocument Type:Conference article (CA)Conference Title:Advanced Optical Manufacturing Technologies and Applications 2024, AOMTA 2024 and 4th International Forum of Young Scientists on Advanced Optical Manufacturing, YSAOM 2024Conference Date:July 5, 2024 - July 7, 2024Conference Location:Xi'an, ChinaConference Sponsor:Advanced Optical Manufacturing Youth Expert Committee, CSOE; Shanghai Engineering Research Center of Ultra-Precision Optical Manufacturing, Fudan University; University of Shanghai for Science and Technology; Xi'an Institute of Optics and Precision Mechanics of CAS; Xi'an Technological UniversityAbstract:The primary mirror system is the key component of the high-precision optical system, and the surface accuracy of the primary mirror determines the imaging quality of the whole system. When the surface accuracy of the primary mirror decreases, the optical performance of the whole optical system will be seriously affected. At this time, the primary mirror of the primary mirror assembly needs to be disassembled, and the secondary assembly of the primary mirror assembly is carried out until the assembly index is met. In this paper, the research object is a 98 mm aperture glass-ceramic primary mirror component, which is composed of a glass-ceramic primary mirror and a primary mirror backplate, and the bonding method is central axis epoxy 2216 adhesive. When the surface shape of the primary mirror changes and exceeds the expected result, the primary mirror and the back plate of the primary mirror need to be removed, and the primary mirror needs to be reassembled. Aim at that bonding mode of the primary mirror component, the primary mirror component need to be placed in a hot oven, and the epoxy 2216 adhesive is inactivated by high temperature baking, so that the micro crystalline glass is separate from the back plate of the primary mirror. In the actual operation process, the heating rate of the thermal oven is too fast, and a higher temperature gradient appears on the surface of the primary mirror. Because of the appearance of the higher temperature gradient, the stress distribution of the primary mirror in the glass-ceramic exceeds its tensile strength, resulting in cracks on the surface of the primary mirror in the glass-ceramic.In this paper, combined with the material properties of glass-ceramics, the causes of cracks are analyzed, and according to the analysis results, a safe disassembly process is formulated for the future disassembly of glass-ceramics. ? 2024 SPIE.Affiliations:(1) Xi’an Institute of Optics and Precision Machinery, CAS, No.17, Xinxi Avenue, High-tech Zone, Shaanxi Province, Xi'an City, ChinaPublication Year:2024Volume:13280Article Number:132800NDOI Link:10.1117/12.3047180數(shù)據(jù)庫ID（收錄號）:20244917483522 -
Record 112 of
Title:Performance analysis of high-spectral-resolution lidar with/without laser seeding technique for measuring aerosol optical properties
Author Full Names:Gao, Fengjia(1); Gao, Fei(1,2,3); Li, Gaipan(1); Yang, Fan(1); Wang, Li(1,2,3); Song, Yuehui(1,2); Hua, Dengxin(1,2,3); Stani?, Samo(4)Source Title:Optics and Lasers in EngineeringLanguage:EnglishDocument Type:Journal article (JA)Abstract:High-spectral-resolution lidar (HSRL) is a powerful tool for aerosol measurements. With/without laser seeding technique in the transmitted laser, the HSRL can be distinguished as the single-longitudinal-mode (SLM) HSRL or the multi-longitudinal-mode (MLM) HSRL, and the Mach-Zehnder interferometer (MZI) with periodic transmittance function can be used as the spectral discriminator in both the SLM HSRL and MLM HSRL. To in-depth knowledge of the respective advantages of the SLM HSRL and MLM HSRL for measuring aerosol optical properties, the working principle, optimal parameter setting, and detection performance of the SLM HSRL and MLM HSRL are analyzed and discussed in detail, respectively. The working principle of the SLM HSRL and MLM HSRL indicate that the effective transmittance of MZI is the important parameter of data retrieval, the main source of retrieval uncertainties, and the key factor of MZI optical path difference (OPD) settings. To ensure that the MZI can achieve the preferable separation for aerosol Mie scattering signals and molecular Rayleigh scattering signals, the optimal OPDs of MZI are set at 165 mm and 1000 mm in the SLM HSRL and MLM HSRL from the aspects of the effective transmittance of MZI and the spectral discrimination ratio (SDR). Besides, to analyze the influence of frequency difference and divergence angle for the detection performance of HSRL, the effective transmittance of MZI and SDR are simulated and the results show that the MLM HSRL has higher requirements for the environmental parameters and the echo beam collimation than the SLM HSRL. Moreover, the HSRLs with SLM and MLM transmitted lasers are constructed in Xi'an for measuring aerosol optical properties. The preliminary measurement results show that the range square corrected signal (RSCS) of Rayleigh channel is smaller than that of Mie channel in both the SLM HSRL and MLM HSRL, while the difference between RSCS of Rayleigh channel and RSCS of Mie channel in the SLM HSRL is larger than that in the MLM HSRL, and the detection range of the SLM HSRL is lower than that of the MLM HSRL. ? 2024 Elsevier LtdAffiliations:(1) School of Mechanical and Precision Instrument Engineering, Xi'an University of Technology, Xi'an; 710048, China; (2) Shaanxi Collaborative Innovation Center for Modern Equipment Green Manufacturing, Xi'an; 710048, China; (3) Key Laboratory of Metrological Optics and Application for State Market Regulation, Xi'an; 710048, China; (4) Center for Atmospheric Research, University of Nova Gorica, Nova Gorica; SI-5000, SloveniaPublication Year:2024Volume:177Article Number:108133DOI Link:10.1016/j.optlaseng.2024.108133數(shù)據(jù)庫ID（收錄號）:20241015672482 -
Record 113 of
Title:Adaptive sliding mode control by memristor-based neural network and its application
Author Full Names:Lin, Di(1,2); Wu, Yiming(1,2); Yang, Sen(3); Zhang, Yin(3); Zhao, Mingshu(3)Source Title:Hongwai yu Jiguang Gongcheng/Infrared and Laser EngineeringLanguage:ChineseDocument Type:Journal article (JA)Abstract:Objective In the optoelectronic pod system, there are various disturbances and unmodeled dynamics. Therefore, it is difficult for conventional control algorithms to adapt to complex situations. The neural network is adopted to realize the adaptive estimation of the unknown dynamics of the model, combined with sliding mode variable structure control, the control accuracy can be effectively improved. However, if the neural network estimation fails to converge to the parameters in the actual model at the initial control stage, chattering phenomenon will arise in the sliding mode control. In order to achieve fast convergence of neural network estimation, suppress the chattering at the initial stage of sliding mode control, and improve control accuracy and stability, the algorithm of adaptive sliding mode control based on memristor-based neural network is proposed herein. Methods An improved memristor-based neural network is adopted to store the weight parameters to approach the unmodeled dynamics, which can reduce network convergence time and improve control accuracy compared to the conventional neural network. In the initial stage of sliding mode variable structure control, a neural network based on memristors is adopted. The adaptive gain is improved to reduce the chattering caused by estimation error of neural network. The improved algorithm in overall significantly reduced the chattering and quickly and accurately estimated unmodeled dynamics, enhancing control accuracy and stability. Under analog simulation conditions, the improved algorithm is compared with conventional sliding mode variable structure method regarding to the sinusoidal position response, and the result shows that the convergence time by the improved algorithm is reduced to half of that of the conventional sliding mode control algorithm (Fig.9). When an actual unmanned aerial vehicle tracking detection is conducted in the outfield, the control accuracy under the improved algorithm is increased by 59.18% compared to the conventional sliding mode control algorithm (Fig.12). Results and Discussions Under analog simulation conditions, compared with conventional sliding mode variable structure method, the convergence accuracy for the sinusoidal position response by adopting the improved algorithm is within 0.0002° while the one by conventional algorithm is within 0.001°, which means the convergence time by the improved algorithm is reduced to half of that of the conventional sliding mode control algorithm (Fig.9). When an unmanned aerial vehicle targets detection is conducted in the outfield, with a maximum speed of maneuvering flight of 15 m/s and a distance of 1 km from the unmanned aerial vehicle to tracking turntable, the stably tracking miss distance (RMS) by the conventional sliding mode control algorithm is 0.009 8°, while the RMS by the improved algorithm is 0.004°, approximately 69.8 μrad, resulting in the increase of accuracy under the improved algorithm by 59.18% compared to the conventional sliding mode control algorithm (Fig.12). Conclusions By adopting the improved algorithm of adaptive sliding mode variable structure control based on the memristor-based neural network, the convergence time of estimation for unknown unmodeled dynamics is reduced, up to half of that of conventional sliding mode control algorithm. In an actual outfield detection experiment, the stably tracking control accuracy by the improved algorithm is increased by 59.18% compared to that by the conventional sliding mode control algorithm. The experimental results show that the use of the improved algorithm of adaptive sliding mode variable structure control based on the memristor-based neural network can not only help the system to realize fast convergence and suppress chattering, but also effectively improve the tracking accuracy and stability of the optoelectronic pod system, which has certain application value in engineering. ? 2024 Chinese Society of Astronautics. All rights reserved.Affiliations:(1) Tongren Intelligent Technology (Xi’an) Co., Ltd, Xi’an Jiaotong University, Tongren Intelligent Systems Science and Intelligent Device Physics Joint Research Institute, Xi’an; 710115, China; (2) Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (3) School of Physics, Xi’an Jiaotong University, Xi’an; 710115, ChinaPublication Year:2024Volume:53Issue:6Article Number:20230667DOI Link:10.3788/IRLA20230667數(shù)據(jù)庫ID（收錄號）:20243717021357 -
Record 114 of
Title:In-line attosecond photoelectron holography for single photon ionization
Author Full Names:Liu, Yanhong(1); Cao, Wei(1); Yao, Ling-Hui(2); Pi, Liang-Wen(2); Zhou, Yueming(1); Lu, Peixiang(1,3)Source Title:Physical Chemistry Chemical PhysicsLanguage:EnglishDocument Type:Journal article (JA)Abstract:The momentum distribution of photoelectrons in H2+ molecules subjected to an attosecond pulse is theoretically investigated. To better understand the laser-molecule interaction, we develop an in-line photoelectron holography approach that is analogous to optical holography. This approach is specifically suitable for extracting the amplitude and phase of the forward-scattered electron wave packet in a dissociating molecule with atomic precision. We also extend this approach to imaging the transient scattering cross-section of a molecule dressed by a near infrared laser field. This attosecond photoelectron holography sheds light on structural microscopy of dissociating molecules with high spatial-temporal resolution. ? 2024 The Royal Society of Chemistry.Affiliations:(1) School of Physics and Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan; 430074, China; (2) Research Center for Attosecond Science and Technology, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (3) Optics Valley Laboratory, Wuhan; 430074, ChinaPublication Year:2024Volume:26Issue:25Start Page:17902-17909DOI Link:10.1039/d3cp05919g數(shù)據(jù)庫ID（收錄號）:20242516295916 -
Record 115 of
Title:Tapered Fiber with Dual Concentric Cores for Broadband Dispersion Compensation
Author Full Names:Geng, Wenpu(1); Zeng, Zhi(2); Zhang, Lin(3); Pan, Zhongqi(4); Yue, Yang(2)Source Title:Specialty Optical Fibers, SOF 2024 in Proceedings Advanced Photonics Congress 2024 - Part of Optica Advanced Photonics CongressLanguage:EnglishDocument Type:Conference article (CA)Conference Title:2024 Specialty Optical Fibers, SOF 2024Conference Date:July 28, 2024 - August 1, 2024Conference Location:Quebec City, QC, CanadaAbstract:A tapered fiber with two Ge-doped concentric cores is proposed to achieve flexible and slope-controllable broadband flat negative dispersion. The dispersion curve of the fundamental mode features ? Optica Publishing Group 2024, ? 2024 The Author(s)Affiliations:(1) Institute of Modern Optics, Nankai University, Tianjin; 300350, China; (2) School of Information and Communications Engineering, Xi'an Jiaotong University, Xi'an; 710049, China; (3) School of Precision Instruments and Opto-electronics Engineering, Tianjin University, Tianjin; 300072, China; (4) Department of Electrical & Computer Engineering, University of Louisiana at Lafayette, Lafayette; LA; 70504, United StatesPublication Year:2024數(shù)據(jù)庫ID（收錄號）:20250417759941 -
Record 116 of
Title:Flexible Ge/Cu/ZnSe multilayer photonic structures for triple-band infrared camouflage, visible camouflage, and radiative cooling
Author Full Names:Huang, Lehong(1,2,3,4); Zhang, Wenbo(1,2,3); Wei, Yuxuan(1,3); Li, Haochuan(1); Li, Xun(1); Ma, Caiwen(1,3,4); Zhang, Chunmin(2)Source Title:Optics ExpressLanguage:EnglishDocument Type:Journal article (JA)Abstract:With the rapid advancement of multi-band detection technologies, military and civilian equipment face an increasing risk of being detected, posing significant challenges to traditional single-band camouflage designs. To address this issue, this study presents an innovative multilayer structure using Ge, Cu, and ZnSe materials to achieve triple-band infrared camouflage, visible camouflage, and radiative cooling. The structure exhibits low emissivity in the short-wave infrared (SWIR, 1.2-2.5μm), mid-wave infrared (MWIR, 3-5μm), and long-wave infrared (LWIR, 8-14μm) bands, with values of 0.23, 0.11, and 0.27 respectively, thus realizing effective infrared camouflage. Additionally, it efficiently radiates heat in the non-atmospheric window (Εˉ5?8μm = 0.62). By adjusting the thickness of the top ZnSe layer, the structure can achieve visual camouflage against various backgrounds, significantly enhancing its effectiveness. The total thickness of the multilayer structure is only 1.33μm, and it is deposited on a flexible polyimide substrate via electron beam evaporation, providing remarkable deformation capability to meet camouflage needs in various complex environments. Experimental results show that, under an input power density of 1097 W/m2, the apparent temperature of the structure is reduced by about 10°C compared to the commonly used engineering material titanium alloy (TC4), significantly reducing the detection range and demonstrating excellent infrared camouflage performance. This study also highlights the broad application prospects of this innovative multi-band camouflage material in both military and civilian fields, particularly its ability to flexibly adapt to different environments and conditions. ? 2024 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.Affiliations:(1) Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (2) School of Physics, Xi’an Jiaotong University, Xi’an; 710049, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China; (4) Key Laboratory of Space Precision Measurement Technology, Chinese Academy of Sciences, Xi’an; 710119, ChinaPublication Year:2024Volume:32Issue:21Start Page:37295-37309DOI Link:10.1364/OE.534651數(shù)據(jù)庫ID（收錄號）:20244217188319 -
Record 117 of
Title:Research progress on hyperspectral anomaly detection
Author Full Names:Qu, Bo(1,2,3); Zheng, Xiangtao(1); Qian, Xueming(2); Lu, Xiaoqiang(1)Source Title:National Remote Sensing BulletinLanguage:ChineseDocument Type:Journal article (JA)Abstract:The applications of remote sensing images in numerous fields have been increasing with the continuous development of aerospace and remote sensing technologies. HyperSpectral Image (HSI) is a common type of remote sensing image that comprises a series of two-dimensional remote sensing images as a 3D data cube. Each two-dimensional image in HSI can reveal the reflection/radiation intensity of different wavelengths of electromagnetic waves, and each pixel of HSI corresponds to the spectral curve reflecting the spectral information in different wavelengths. Therefore, the hyperspectral remote sensing images are characterized by"spatial-spectral integration," which contains not only spectral information with strong discriminant but also rich spatial information. Therefore, the hyperspectral data have considerable application potential. Hyperspectral anomaly detection aims to detect pixels in a scene with different characteristics from surrounding pixels and determines them as anomalous targets without any previous knowledge of the target. Hyperspectral anomaly detection is an unsupervised process that does not require any priori information regarding the target to be measured in advance; thus, this type of detection plays a crucial role in real life. For example, anomaly target detection technology can be used to search and rescue people after a disaster, quickly determine the fire point of a forest fire, and search mineral points in mineral resource exploration. Hyperspectral anomaly detection has been a popular research direction in the area of remote sensing image processing in recent years, and a numerous researchers have conducted extensive research and achieved rich research results. However, hyperspectral anomaly detection still encounters many difficult problems. For example, the targets of the same material may exhibit various spectral characteristics due to the different imaging equipment and environment, which may interfere with the detection results and lead to the problem of"same object with different spectra."Meanwhile, the targets of different materials may also exhibit the problem of"different objects with different spectra."Then, most of the existing hyperspectral anomaly detection algorithms are only in the laboratory stage and with low technology maturity. Furthermore, the hyperspectral data may have numerous spectral bands that contain a considerable amount of redundant information, which increases the difficulty of data processing. Moreover, the number of publicly available hyperspectral anomaly detection datasets is insufficient and mostly old. In this paper, the main research progress of hyperspectral anomaly detection is first summarized. The existing mainstream algorithms are then classified and summarized. These algorithms are mainly divided into five categories: statistics-based anomaly detection methods, data expression-based anomaly detection methods, data decomposition-based anomaly detection methods, deep learning-based anomaly detection methods, and other methods. Through the investigation, analysis, and summary of the existing methods, three future development directions of hyperspectral anomaly detection are proposed. (1) Database expansion: new datasets with additional images and highly sophisticated remote sensing sensors are introduced. (2) Multisource data combination: the advantages of different imaging sensors and various types of remote sensing data are maximized. (3) Algorithm practicality: the anomaly detection algorithms are relayed for application on real platforms. ? 2024 Science Press. All rights reserved.Affiliations:(1) Key Laboratory of Spectral Imaging Technology CAS, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (2) School of Information and Communication Engineering, Xi’an Jiaotong University, Xi’an; 710049, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, ChinaPublication Year:2024Volume:28Issue:1Start Page:42-54DOI Link:10.11834/jrs.20232405數(shù)據(jù)庫ID（收錄號）:20241515892466 -
Record 118 of
Title:Real-time Target Detection and Velocity Measurement for Spacecraft Docking Based on Improved Arc-support LSs Ellipse Detection
Author Full Names:Wu, Xiongzhi(1,2,4); Wu, Jiaxin(1,2,4); Zhang, Haifeng(1,4); Duan, Yingni(3); Meng, Han(1,4)Source Title:Proceedings of SPIE - The International Society for Optical EngineeringLanguage:EnglishDocument Type:Conference article (CA)Conference Title:3rd International Conference on Optics and Machine Vision, ICOMV 2024Conference Date:January 19, 2024 - January 21, 2024Conference Location:Nanchang, ChinaAbstract:With the development of China's space station, rendezvous and docking between spacecraft and the station have become more frequent. Smooth and safe docking speed is important for the effectiveness of docking missions. In this context, vision-based docking speed measurement comes into view. Visual measurement is a commonly used method. It is a non-contact measurement method, which is realized by optical measurement principles and equipment to measure the structure under test. We propose an improved ellipse detection method for arc-support LSs.The method first forms an arc support group, verifies this prior knowledge on the basis of the arc support group according to the feature that the ellipse cross target is always in the center of the image, and sets a prior box to narrow the detection range of the ellipse. and then generates an initial ellipse set using two complementary methods, and after selecting the significant ellipse candidates and refining them as the detection points, achieves an efficient and high-quality ellipse detection. The docking speed calculation formula was established based on the physical imaging model. It is validated on our own docking simulation video and the real public Shenzhou XVI and Shenzhou XVII spacecraft docking videos, with a recall of 0.9353 and an FPS of 8.513 on the simulation video, which is more efficient and high-quality than other traditional ellipse detection methods, and the speed measurement errors are 5.8% and 3.6% on the two real public videos, which improves the spacecraft docking speed measurement robustness. ? 2024 SPIE.Affiliations:(1) Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Xi’an University, Department of Robotics Engineering, Xi’an; 710065, China; (4) Xi’an Key Laboratory of Spacecraft Optical Imaging and Measurement Technology, Xi’an; 710119, ChinaPublication Year:2024Volume:13179Article Number:131790KDOI Link:10.1117/12.3031610數(shù)據(jù)庫ID（收錄號）:20243216830238 -
Record 119 of
Title:PDE Standardization Analysis and Solution of Typical Mechanics Problems
Author Full Names:Wang, Ningjie(1); Wang, Yihao(1); Pei, Yongle(2); Li, Luxian(1)Source Title:CMES - Computer Modeling in Engineering and SciencesLanguage:EnglishDocument Type:Journal article (JA)Abstract:A numerical approach is an effective means of solving boundary value problems (BVPs). This study focuses on physical problems with general partial differential equations (PDEs). It investigates the solution approach through the standard forms of the PDE module in COMSOL. Two typical mechanics problems are exemplified: The deflection of a thin plate, which can be addressed with the dedicated finite element module, and the stress of a pure bending beam that cannot be tackled. The procedure for the two problems regarding the three standard forms required by the PDE module is detailed. The results were in good agreement with the literature, indicating that the PDE module provides a promising means to solve complex PDEs, especially for those a dedicated finite element module has yet to be developed. Copyright ? 2024 The Authors. Published by Tech Science Press.Affiliations:(1) State Key Laboratory for Strength and Vibration of Mechanical Structures, Shaanxi Key Laboratory of Environment and Control for Flight Vehicle, School of Aerospace Engineering, Xi’an Jiaotong University, Xi’an; 710049, China; (2) Xi’an Institute of Optics and Precision Mechanics of Chinese Academy of Sciences, Xi’an; 710119, ChinaPublication Year:2024Volume:141Issue:1Start Page:171-186DOI Link:10.32604/cmes.2024.053520數(shù)據(jù)庫ID（收錄號）:20243516928022 -
Record 120 of
Title:A 4×112Gbps Compact Polarization-Insensitive Silicon Photonic WDM Receiver
Author Full Names:Xue, Jintao(1,2); Wu, Jinyi(1,3); Cheng, Chao(1,3); Zhang, Wenfu(1,2); Wang, Binhao(1,2)Source Title:Optical Fiber Communication Conference in Proceedings Optical Fiber Communication Conference, OFC 2024Language:EnglishDocument Type:Conference article (CA)Conference Title:2024 Optical Fiber Communication Conference, OFC 2024Conference Date:March 24, 2024 - March 28, 2024Conference Location:San Diego, CA, United statesAbstract:A 4×112Gbps polarization-insensitive silicon photonic WDM receiver with a two-dimensional grating coupler, cascaded dual-ring filters and bidirectional photodiodes is demonstrated. A polarization-dependent loss of 0.45dB is achieved. ? 2024 The Author(s).Affiliations:(1) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (2) School of Future Technology, University of Chinese Academy of Sciences, Beijing; 100049, China; (3) School of Optoelectronics, University of Chinese Academy of Sciences, Beijing; 100049, ChinaPublication Year:2024DOI Link:10.1364/ofc.2024.w3a.6數(shù)據(jù)庫ID（收錄號）:20244417281788