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Single-shot double-pulse range-gated 3D imaging

Chinese Optics Letters 2025年第3期 31-36页

作者：孙均全殷永凯范华张晓磊孙宝清 School of Information Science and Engineering Shandong University Key Laboratory of Laser&Infrared System Ministry of Education Qilu University of Technology Shandong Academy of Sciences

Range-gated imaging has the advantages of long imaging distance,high signal-to-noise ratio,and good environmental ***,conventional range-gated imaging utilizes a single laser pulse illumination modality,which can only resolve a single depth of ranging in one ***-dimensional (3D) imaging has to be obtained from multiple shots,which limits its real-time ***,an approach of range-gated imaging using a specific double-pulse sequence is proposed to overcome this *** the help of a calibrated double-pulse range-intensity profile,the depth of static targets can be calculated from the measurement of a single ***,the double-pulse approach is beneficial for real-time depth estimation of dynamic *** results indicate that,compared to the conventional approach,the depth of field and depth resolution are increased by 1.36 and 2.20 times,*** is believed that the proposed double-pulse approach provides a potential new paradigm for range-gated 3D imaging.

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A Semi-supervised Low-Light Image Enhancement with Color Guidance

A Semi-supervised Low-Light Image Enhancement with Color Gui...

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Asia-Pacific Signal and Information Processing Association Annual Summit and Conference (APSIPA)

作者： Yuxin Wang Shuolin Yang Qianxi Wu Zhishuo Zhang Yunxia Liu Yang Yang Yakui Dong Cheng Fei Junliang Liu Lili Wang Shuzhen Fan Yongfu Li Center for Optics Research and Engineering (CORE) Shandong University Qingdao China Key Laboratory of Laser & Infrared System Ministry of Education Shandong University Qingdao China School of Information Science and Technology Shandong University Qingdao China

ISBN: (数字)9798350367331

ISBN: (纸本)9798350367348

Low-light image enhancement (LLIE) has found extensive applications in surveillance and related fields. Current deep learning-based algorithms have demonstrated significant advantages over traditional methods for LLIE. However, the issue of color distortion still remains a challenge. This paper proposes a semi-supervised curve estimation and restoration network that consists of two cascaded sub-networks with distinct functionalities. The first-level sub-network applies specific constraints to enhance different regions based on their brightness levels. The second-level sub-network is trained using superpixel color consistency loss and global histogram loss to effectively correct color distortion. Experimental results demonstrate that the proposed method achieves satisfactory outcomes in both visual quality and evaluation metrics.

关键词： Measurement Histograms Visualization Image color analysis Surveillance Brightness Estimation Distortion Image restoration Image enhancement

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Controllable growth of type-II Dirac semimetal PtTe2 atomic layer on Au substrate for sensitive room temperature terahertz photodetection

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InfoMat 2021年第6期3卷 705-715页

作者： Yang Yang Kaixuan Zhang Libo Zhang Guo Hong Chao Chen Hongmei Jing Jiangbo Lu Peng Wang Xiaoshuang Chen Lin Wang Hua Xu Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education Shaanxi Key Laboratory for Advanced Energy DevicesSchool of Materials Science and EngineeringShaanxi Normal UniversityXi'anChina State Key Laboratory for Infrared Physics Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghaiChina Department of Optoelectronic Science and Engineering Donghua UniversityShanghaiChina Department of Physics and Chemistry Faculty of Science and TechnologyInstitute of Applied Physics and Materials EngineeringUniversity of MacaoMacaoChina School of Physics and Information Technology Shaanxi Normal UniversityXi'anChina

Platinum telluride(PtTe_(2)),a member of metallic transition metal dichalcogenides,provides a new platform for investigating various properties such as type-II Dirac fermions,topological superconductivity,and wide-band ***,the study of PtTe_(2)is largely limited to exfoliated flakes,and its direct synthesis remains ***,we report the controllable synthesis of highly crystalline 2D PtTe_(2)crystals with tunable morphology and thickness via chemical vapor deposition(CVD)growth on Au *** adjusting Te amount and substrate temperature,anisotropic and isotropic growth modes of PtTe_(2)were realized on the solid and molten Au substrates,*** domain size of PtTe_(2)crystal was achieved up to 30μm,and its thickness can be tuned from 5.6 to 50 nm via controlling the growth ***,a metal–PtTe_(2)–metal structural device was fabricated to validate the wide-band terahertz(THz)photodetection from 0.04 to 0.3 THz at room *** to the high crystallinity of PtTe_(2)crystal,the photodetector acquires high responsivity(30–250 mA W-1 from 0.12 to 0.3 THz),fast response rate(rise time:7μs,decay time:8μs),and high-quality imaging *** work demonstrates the feasibility for realistic exploitation of high-performing photodetection system at THz band based on the CVDgrown 2D Dirac semimetal materials.

关键词： 2D materials chemical vapor deposition Dirac semimetal platinum telluride terahertz photodetection

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Next-generation machine vision systems incorporating two-dimensional materials: Progress and perspectives

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InfoMat 2022年第1期4卷 23-39页

作者： Peisong Wu Ting He He Zhu Yang Wang Qing Li Zhen Wang Xiao Fu Fang Wang Peng Wang Chongxin Shan Zhiyong Fan Lei Liao Peng Zhou Weida Hu State Key Laboratory of Infrared Physics Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghaiChina University of Chinese Academy of Sciences BeijingChina Hangzhou Institute for Advanced Study University of Chinese Academy of SciencesHangzhouChina State Key Laboratory of ASIC and System School of MicroelectronicsFudan UniversityShanghaiChina Henan Key Laboratory of Diamond Optoelectronic Materials and Devices School of Physics and EngineeringZhengzhou UniversityZhengzhouChina Department of Electronic and Computer Engineering The Hong Kong University of Science and TechnologyClear Water BayKowloonHong Kong SARChina School of Physics and Electronics Hunan UniversityChangshaChina

Machine vision systems(MVSs)are an important component of intelligent systems,such as autonomous vehicles and ***,with the continuous increase in data and new application scenarios,new requirements are put forward for the next generation of *** is an urgent need to find new material systems to complement the existing semiconductor technology based on thin-film materials,and new architectures must be explored to improve *** of their unique physical properties,two-dimensional(2D)materials have received extensive attention for use in MVSs,especially in biomimetic ones:the human visual system,which can process complex visual information with low power consumption,provides a model for next-generation *** review paper summarizes the progress and challenges of applying 2D material photodetectors in sense-memory-computational integration and biomimetic image sensors for machine vision.

关键词： in-sensor computing machine vision systems photodetectors two-dimensional materials

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Designing Fragile-to-Strong Crystallization Kinetics in Confined Nanoscale Films for Improved Phase-Change Memory Performances

SSRN

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SSRN 2024年

作者： Chen, Yimin Wang, Guoxiang Chen, Bin Gu, Chenjie Gao, Yixiao Liu, Zijun Zou, Qiushun Xu, Tiefeng Wang, Jun-Qiang Lotnyk, Andriy Shen, Xiang Department of Microelectronic Science and Engineering School of Physical Science and Technology Ningbo University Ningbo315211 China Laboratory of Infrared Material and Devices Key Laboratory of Photoelectric Materials and Devices of Zhejiang Province Advanced Technology Research Institute Ningbo University Ningbo315211 China Co. Ltd. Wuhan430205 China CAS Key Laboratory of Magnetic Materials and Devices Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology Ningbo Institute of Materials Technology & Engineering Chinese Academy of Sciences Ningbo315201 China Permoserstrasse 15 LeipzigD-04318 Germany

Designing the crystallization process in confined nanoscale phase-change materials (PCMs) is crucial for developing universal memory and neuro-inspired computation. This requires a comprehensive understanding of phase-change behavior, especially in complex situations involving interfacial effects, nanoscale effects, and non-isothermal conditions. We designed 2D confined nanoscale GeTe films and investigated thickness dependent crystallization kinetics using non-isothermal Flash DSC method. Compared to conventional Ge2Sb2Te5, we found the nanoscale GeTe films exhibit both the faster crystallization and better amorphous thermal stability, which is attributed to the distinct fragile-to-strong crossover (FSC) behavior. Noteworthily, the FSC magnitude is always ~2 for 2D confined films, but the FSC temperature increases significantly as the film thickness decreases to nanometers. The thickness dependent crystal growth rate of confined PCMs can be depicted by an exponential expression, yielding the thickness of ~10 nm is optimal for phase-change memory. We confirmed the 10 nm GeTe based device has fast SET speed of 6 ns after applying 2.5 V voltage pulse. We also revealed the explored FSC behavior stems from the competition between heterogenous nucleation at interface and crystal growth in the inner film. These findings would be a useful guideline for future phase-change neuro-inspired computing and provide supports to data-intensive applications. © 2024, The Authors. All rights reserved.

关键词： Phase change memory

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Dual-symmetry-perturbed all-dielectric resonant metasurfaces for high-Q perfect light absorption

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Chinese Optics Letters 2024年第2期22卷 200-206页

作者：葛俊洋高一骁徐雷周宁沈祥 Laboratory of Infrared Materials and Devices Research Institute of Advanced TechnologiesNingbo UniversityNingbo 315211China Key Laboratory of Photoelectric Detection Materials and Devices of Zhejiang Province Ningbo 315211China Advanced Optics&Photonics Laboratory Department of EngineeringSchool of Science and TechnologyNottingham Trent UniversityNottingham NG118NSUK School of Physics and Optoelectronic Engineering Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of SciencesHangzhou 310024China Ningbo Institute of Oceanography Ningbo 315832China

We demonstrate a high-Q perfect light absorber based on all-dielectric doubly-resonant *** bound states in the continuum(BICs)protected by different symmetries,we manage to independently manipulate the Q factors of the two degenerate quasi-BICs through dual-symmetry perturbations,achieving precise matching of the radiative and nonradiative Q factors for degenerate critical *** achieve a narrowband light absorption with a>600 Q factor and a>99%absorptance atλ_(0)=1550 nm on an asymmetric germanium metasurface with a 0.2λ_(0)*** work provides a new strategy for engineering multiresonant metasurfaces for narrowband light absorption and nonlinear applications.

关键词： resonant metasurface perfect light absorption bound states in the continuum

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Axiotaxy driven growth of belt-shaped InAs nanowires in molecular beam epitaxy

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Nano Research 2021年第7期14卷 2330-2336页

作者： Qiang Sun Dong Pan Xutao Zhang Jianhua Zhao Pingping Chen Wei Lu Jin Zou School of Materials Engineering University of QueenslandQueensland 4072Australia Centre for Microscopy and Microanalysis The University of QueenslandQueensland 4072Australia State Key Laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China School of Physical Science and Technology Northwestern Polytechnical UniversityXi'an 710129China State Key Laboratory for Infrared Physics Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghai 200083China

In this study,we demonstrate the axiotaxy driven growth of belt-shaped InAs nanowires using Au catalysts by molecular beam *** is found that,the zinc-blende structured InAs nanowires,with the features of[113]growth direction and extensive{110}side-surfaces,are induced by catalysts in Au–In α phase through the axiotaxy growth,in which the lattice mismatch between the projections of atomic planes onto nanowire/catalyst interfaces is minimized by forming extraordinary tilted *** atomic-resolution in situ TEM heating experiments show that the catalysts remained in the solid state of Au–In α phase during the axiotaxy growth,by which the vapor–solid–solid growth mechanism can be *** manipulating the growth direction,this unusual growth mechanism can provide a practical pathway to control the morphology of the low-dimensional nanomaterials,from conventional nanowires to belt-shaped nanowires utilizing a significant lateral growth,simply using nanoparticles as catalyst.

关键词： InAs nanowire axiotaxy molecular beam epitaxy

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Self-Powered Broadband Photodetector Based on a Monolayer InSe p-i-n Homojunction

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Physical Review Applied 2023年第1期19卷 014039-014039页

作者： Lin Li Peize Yuan Ting Liu Zinan Ma Congxin Xia Xueping Li School of Physics Henan Key Laboratory of Infrared Materials & Spectrum Measures and Applications Henan Normal University Xinxiang Henan 453007 China College of Science Zhengzhou Key Laboratory of Low-Dimensional Quantum Materials and Devices Zhongyuan University of Technology Zhengzhou 450007 China College of Electronic and Electrical Engineering Henan Normal University Xinxiang Henan 453007 China

The two-dimensional homojunction is promising in electronic and optoelectronic applications. However, its performance is restricted by lattice mismatch and the depletion region. Here, we construct a monolayer InSe-based p-i-n homojunction photodetector. It presents high photoelectric conversion with a wide light response in the photon-energy range from 1.4 to 5 eV, which induces a photocurrent density of 13.13 nA m−1 and a photoresponsivity of 0.022 A W−1. Moreover, the gate voltage improves the photocurrent and photoresponsivity almost fourfold. Additionally, the increasing dielectric constant of the substrate decreases the photocurrent spectral width, and a low doping concentration is suitable for photodetectors due to high mobility. These results indicate that the two-dimensional p-i-n homojunction is promising for future photoelectric devices.

关键词： Optoelectronics 2-dimensional systems Junctions Monolayer films Photodiodes Semiconductor compounds Density functional calculations

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Wave vector filter based on surface and Tamm plasmon polaritons

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Optics Letters 2025年第12期50卷 3939-3942页

作者： Qixiang Jia Qingquan Liu Xueyu Guan Peiqi Yu Hengyi Cui Zhongshi Huang Ruonan Ji Hailing Wang Wei Lu Shaowei Wang Key Laboratory of Infrared Science and Technology Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai 200083 China School of Physical Science and Technology ShanghaiTech University Shanghai 201210 China Shanghai Research Center for Quantum Sciences Shanghai 201315 China University of Chinese Academy of Sciences Beijing 100049 China State Key Laboratory of Precision Spectroscopy East China Normal University Shanghai 200241 China Collaborative Innovation Center of Extreme Optics Shanxi University Taiyuan Shanxi 030006 China luwei@***

This study proposes a wave vector filter leveraging coupling-induced transparency (CIT) between surface plasmon polaritons (SPPs) and Tamm plasmon polaritons (TPPs) to enable simultaneous wavelength and incident-angle selection, overcoming conventional optical filters’ inability to control both parameters. By synergizing the wave vector selectivity of SPPs with the low-loss field enhancement of TPPs, the device achieves efficient spectral–angular filtering in the short-wave infrared regime. Structural optimization of silver gratings and Ag/distributed Bragg reflector (DBR) layers yields a 60% transmission peak at 2.08 μm. The transmission intensity decreases by an order of magnitude with 0.2° angular deviation, demonstrating exceptional wave vector selectivity. Experimental validation confirms the angle–wavelength dual-selectivity mechanism, showing strong agreement with theoretical models. This work addresses critical challenges in multi-parameter photonic control, offering a breakthrough for hyperspectral imaging, multi-channel sensing, and on-chip nonlinear photonic systems. The CIT-based platform provides a novel design paradigm, to the best of our knowledge, for advanced photonic devices requiring joint spectral–spatial resolution.

关键词： Bragg reflectors Field enhancement Optical constants Optical filters Photonic devices Resolution

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Research on infrared Computational Multispectral Imaging technology Based on Coding Mask 9

Research on Infrared Computational Multispectral Imaging Tec...

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9th Symposium on Novel Photoelectronic Detection technology and Applications

作者： Li, Dapeng Zhou, Weiwen Liu, Sha Wu, Jianrong Zhang, Xiaotong Shanghai Aerospace Control Technology Institute No.1555 Zhongchun Road Minhang District Shanghai201109 China Shanghai Academy of Spaceflight Technology No.3888 Yuanjiang Road Minhang District Shanghai201109 China Infrared Detection Technology Research & Development Center CASC No.1555 Zhongchun Road Minhang District Shanghai201109 China Key Laboratory for Quantum Optics Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Science Shanghai201800 China

ISBN: (纸本)9781510664432

Limited by the current technological development level of infrared detectors, it is difficult for the infrared multispectral imaging systems to meet the requirements of practical engineering application indicators such as low structural complexity and high transmittance at the same time. In order to promote the engineering application level of computational imaging technology in the infrared spectrum, this paper proposes a snapshot computational spectral imaging technology scheme based on reflective coding mask;this scheme utilizes the built-in reflective coding mask in traditional imaging system: Firstly, complete the design and molding of the coding mask according to the index requirements, complete the information calibration of the coding mask in the spatial dimension and the spectral dimension by building a high-precision spectral calibration module, and then combine the compressive sensing image restoration algorithm according to the calibration results, finally realize the Imaging and spectral data extraction of targets. laboratory indoor imaging shows that this scheme can realize broad-spectrum imaging of indoor targets and extraction of multi-spectral information of targets. Compared with the technical scheme of traditional optical filter and grating infrared spectrometer, it has the technical advantages of simple structure and high transmittance. © 2023 SPIE.

关键词： Compressed sensing

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