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2024 Applied Optics and Photonics China: Optical Sensing, Imaging technology, and Applications, AOPC 2024

作者： Dan, Ding Feng, Shi Hongchang, Cheng Xin, Guo Lei, Yan Hongjin, Qiu Kunming Physics Research Institute Kunming650223 China National Key Laboratory of Science and Technology on Low Level Light Xi'an710065 China

ISBN: (数字)9781510687820

ISBN: (纸本)9781510687813

low-light-level (LLL) real-time color imaging technology plays an important role in military reconnaissance, scientific detection, security monitoring and assisted driving, and is one of the key technologies developed domestically and internationally. When the ambient light is insufficient, the imaging effect of the human eye is reduced. In order to enhance human eye recognition ability under low illumination and obtain imaging effects with real color, high resolution and high sensitivity, more and more teams are committed to researching LLL real-time color imaging technology. Firstly, the impact of human visual limitation and physical constraint on LLL real-time color imaging is analyzed in this paper. Then, the current research progress of LLL real-time color imaging technology is introduced. Finally, according to the future research direction, the problems and key methods that need to be further studied are proposed. © 2024 SPIE.

关键词： Color image processing

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Surface activation process of nickel-supported monolayer graphene 9

Surface activation process of nickel-supported monolayer gra...

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9th Symposium on Novel Photoelectronic Detection technology and Applications

作者： Tang, Song Wang, Dongzhi Wang, Qiming Li, Shiman Shi, Feng Zhang, Yijun School of Electronic and Optical Engineering Nanjing University of Science and Technology Nanjing210094 China National Key Laboratory of Science and Technology on Low-Level-Light Xi'an710065 China

ISBN: (纸本)9781510664432

Electron source can be considerably benefited from the application of photocathodes with long lifetime, broad spectral response and high quantum efficiency. As graphene has exhibited potential to serve as the passivation layer to improve electron emission behavior of photocathodes due to its unique structure and properties, exploring photoemission phenomenon of metal-supported graphene material can help to develop robust photocathodes. We report the photoemission performance of the nickel-supported monolayer graphene through various activation processes. To investigate the effects of different activation processes on this composite material, we compare the photoemission behavior of the nickel-supported monolayer graphene by cesium (Cs)-only activation at room temperature, Cs-only activation under heated condition and cesium-oxygen (Cs/O) activation under heated condition. The experimental results show that these activation methods are able to promote photoemission ability of the nickel-supported monolayer graphene. Among them, the Cs/O activation process under heated condition can improve the photocurrent most significantly. This process validation of activating the nickel-supported graphene material provides a new route to enhance photoemission performance of metal photocathodes, and the activation method could be applied to the surface modification of other metal-supported graphene materials. © 2023 SPIE.

关键词： Monolayers

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Temporal response of laminated graded-bandgap GaAs-based photocathode with distributed Bragg reflection structure:Model and simulation

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Chinese Physics B 2022年第9期31卷 628-635页

作者： Zi-Heng Wang Yi-Jun Zhang Shi-Man Li Shan Li Jing-Jing Zhan Yun-Sheng Qian Feng Shi Hong-Chang Cheng Gang-Cheng Jiao Yu-Gang Zeng School of Electronic and Optical Engineering Nanjing University of Science and TechnologyNanjing 210094China National Key Laboratory of Science and Technology on Low-Level-Light Xi'an 710065China Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China

To describe the dynamic response characteristics of the laminated graded-bandgap GaAs-based photocathode with distributed Bragg reflection structure,a general theoretical temporal response model is deduced by combining the unsteady continuity equation and numerical calculation *** the model,the contribution of the distribution Bragg reflec-tion structure and graded-bandgap emission layer to the temporal response are ***,the relationships between the temporal response characteristics of the laminated GaAs-based photocathode and different structural parame-ters are also analyzed,including average electron decay time,emission layer thickness,and incident light *** is found that the introduction of distribution Bragg reflection(DBR)layer solves the discrepancy between the absorption capability of the emission layer and the temporal ***,the distributed Bragg reflection layer can improve the time response by optimizing the initial photoelectron *** improvement effect of the DBR layer on the temporal response is enhanced with the emission layer thickness decreasing or the incident light wavelength *** results explain the effect of the DBR layer of the photocathode on the dynamic characteristics,which can offer a new insight into the dynamic research of GaAs-based photocathode.

关键词： temporal response GaAs-based photocathode distribution Bragg reflection graded-bandgap

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The scintillation noise characteristics investigation and quantitative evaluation of low light level image intensifier 9

The scintillation noise characteristics investigation and qu...

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9th Symposium on Novel Photoelectronic Detection technology and Applications

作者： Qiu, Xiangbiao Guo, Xin Liu, Dan Wu, Haoyu Zhang, Ni Wang, Jian Jiao, Gangcheng Cong, Xiaoqing Jin, Ge Qiao, Fangjian Xu, Zhao Nie, Huijun North Night Vision Technology （Nanjing）Research Institute Co. Ltd Nanjing211106 China National Key Laboratory of Science and Technology on Low-Level-Light Xi'an710065 China

ISBN: (纸本)9781510664432

This paper proposed a "high-speed imaging + digital processing" evaluation method to solve the problem of scintillation noise of low light image intensifiers under low illumination, which fills the gap in the quantitative evaluation of scintillation noise characteristics under low illumination in China. It was found that the scintillation noise is mainly characterized by scintillations with a diameter over 50μm and a duration of sub-microsecond or less. The frequency and the brightness of the scintillations are used to quantitatively evaluate scintillation noise. The effects of the input illuminance and luminous gain on the scintillation noise of the domestic low light image intensifier were investigated by the proposed method. With the increase of input illuminance, the frequency of scintillation noise increases linearly, and the brightness does not change obviously. As the luminous gain of the image intensifier increases, the frequency of scintillation noise increases linearly, but the rate of increase in scintillation frequency is higher than that of luminous gain increase. Based on the characteristics of scintillation noise, such as size, duration, intensity, and the variation law with various conditions, the scintillation noise of the image intensifier can be further studied. The quantitative evaluation method of scintillation noise based on scintillation noise frequency and average equivalent input electron quantity proposed in this paper is of great significance to the breakthrough of scintillation noise and the improvement of the performance of image tubes under low illumination in the future. © 2023 SPIE.

关键词： Scintillation

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Electron beam pumping improves the conversion efficiency of low-frequency photons radiated by perovskite quantum dots

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Chinese Physics B 2023年第4期32卷 754-761页

作者：杜鹏母一宁任航 Idelfonso Tafur Monroy 李彦正樊海波王帅 Makram Ibrahim 梁栋 School of Physics Changchun University of Science and TechnologyChangchun 130022China Institute for Photonic Integration Eindhoven University of TechnologyEindhoven 5600 MBNetherlands Science and Technology on Low-Light-Level Night Vision Laboratory Xi’an 710018China Kunming Institute of Physics Kunming 650221China Solar and Space Research Department National Research Institute of Astronomy and Geophysics(NRIAG)Cairo 11421Egypt

This research argues that using an electron beam with high kinetic energy to pump perovskite quantum dots can significantly boost the efficiency of the low-frequency photon radiation ***,we measure the random lasing threshold and luminescence threshold of CsPbX_(3)films pumped by an electron ***,we simulate the spatial distribution of the electron beams in CsPbX_(3)*** with the above data,a low-frequency photon radiation conversion model based on the electron pumped perovskite quantum dots is *** could be a way to create a terahertz source with a high-power output or to multiply the terahertz power.

关键词： electron beam perovskite quantum dots THz

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Photoemission evidence of a novel charge order in kagome metal FeGe

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science China(Physics,Mechanics & Astronomy) 2025年第6期68卷 172-178页

作者： Zhisheng Zhao Tongrui Li Peng Li Xueliang Wu Jianghao Yao Ziyuan Chen Yajun Yan Shengtao Cui Zhe Sun Yichen Yang Zhicheng Jiang Zhengtai Liu Alex Louat Timur Kim Cephise Cacho Aifeng Wang Yilin Wang Dawei Shen Juan Jiang * and Donglai Feng Department of Physics School of Emerging TechnologyUniversity of Science and Technology of ChinaHefei 230026China Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China National Synchrotron Radiation Laboratory School of Nuclear Science and TechnologyUniversity of Science and Technology of ChinaHefei 230026China Low Temperature Physics Laboratory College of Physics and Center of Quantum Materials and DevicesChongqing UniversityChongqing 401331China State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology(SIMIT)Chinese Academy of SciencesShanghai 200050China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201210China Diamond Light Source Ltd. Harwell Science and Innovation CampusDidcot OX110DEUK New Cornerstone Science Laboratory University of Science and Technology of ChinaHefei 230026China

The kagome metal FeGe provides a rich platform for understanding the mechanisms behind competing orders,as it exhibits charge order(CO)emerging deep within the antiferromagnetic *** investigate the intrinsic origin of this behavior,we examine the evolution of the low-energy electronic structure across the phase transition in annealed FeGe samples using angleresolved photoemission *** find no evidence supporting a conventional nesting mechanism,such as Fermi surface nesting or van Hove ***,we observe two notable changes in the band structure:an electron-like band around the K point and another around the A point,both shifting upward in energy when CO *** findings are consistent with our density-functional theory calculations,which suggest that the charge order in FeGe is primarily driven by magnetic energy savings due to a lattice distortion involving *** results provide photoemission evidence supporting this novel mechanism for CO formation in FeGe,in contrast to the conventional nesting-driven mechanisms.

关键词： kagome metal charge order electronic structure angle-resolved photoemission spectroscopy

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Substrate effects on surface activation processes of graphene/metal composite photocathodes 12

Substrate effects on surface activation processes of graphen...

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Optoelectronic Devices and Integration XII 2023

作者： Tang, Song Zhang, Yijun Jiao, Gangcheng Shi, Feng Wang, Dongzhi Tong, Zehao Jiang, Yu Hao, Guanghui Science and Technology on Low-Light-Level Night Vision Laboratory Xi'an710065 China School of Electronic and Optical Engineering Nanjing University of Science and Technology Nanjing210094 China National Key Laboratory of Science and Technology on Vacuum Electronics Beijing Vacuum Electronics Research Institute Beijing100015 China

ISBN: (纸本)9781510667778

Graphene is considered a suitable atomically thick layer on photocathodes, and the photoemission performance of the graphene-covered photocathodes can be enhanced through Cs/O activation. To investigate the effects of the substrate materials beneath the graphene layer on Cs/O deposition and photoemission performance. We compare the activation processes and photoemission performances of few-layer graphene supported by nickel and copper to investigate the effects of the substrate materials beneath the graphene layer on Cs/O deposition and photoemission performance. By Cs/O activation, the nickel-supported few-layer graphene can possess a higher response at 405 nm, while the copper-supported cathode can acquire a wider spectral response and better stability. After degradation, we discover that the samples supported by nickel and copper can act differently through the additional Cs/O deposition processes, while the surface barrier heights of both samples are further decreased. © 2023 SPIE.

关键词： Graphene

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Multi-scale Deep Curve Estimation for low-light Image Enhancement 2022

Multi-scale Deep Curve Estimation for Low-light Image Enhanc...

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7th International Conference on Multimedia and Image Processing, ICMIP 2022

作者： Zhang, Xin Wang, Xia Jiao, Gangcheng Yang, Ye Cheng, Hongchang Yan, Bo Key Laboratory of Optoelectronic Imaging Technology and System Ministry of Education Beijing Institute of Technology Beijing100081 China Science and Technology on Low-Light-Level Night Vision Laboratory China

ISBN: (纸本)9781450387408

Due to the limitation of the device, pictures taken in low-light environment usually consist of unpleasant deterioration, such as low contrast and color distortion. In this paper, we propose a Multi-scale Deep Curve Estimation network (MSDCE) for low-light image enhancement, which formulates the single low-light image enhancement task as a pixel-wise curve estimation by paired learning. To impose more priors of low-light regions, we propose an inverse illuminance map as part of the Curve Estimation network input. The curve estimation network backbone is composed of multi-scale modules which learns information from multi-scale feature streams and ensures the information exchange across different scales. Compared with several state-of-The-Art methods, our method is significantly better. From the perspective of visual evaluation, our MSDCE can effectively improve the contrast and illumination of the image, and ensure the color fidelity of the image. CCS CONCEPTS •Computing methodologies •Artificial intelligence •Computer vision •Computer vision problems •Reconstruction © 2022 ACM.

关键词： Image enhancement

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Effect of Gradient Doping on Charge Collection Efficiency of EBCMOS Devices

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Advances in Multimedia 2022年第0期2022卷

作者： Qin, Xulei Shi, Qidong Shi, Feng Li, Ye Song, De National Key Laboratory of Science and Technology on Low-Level-Light Xi'an710065 China Changchun University of Science and Technology Changchun130022 China

We investigated the effect of different gradient doping methods on the charge collection efficiency of the electron multiplication layer of EBCMOS devices. Exponential doping of the electron multiplication layer can form a built-in electric field in the electron multiplication layer that is favorable for photoelectron transport, so exponential doping instead of uniform doping in the electron multiplication layer of EBCMOS can effectively improve the charge collection efficiency. It is shown that exponential heavy doping on the side of the electron multiplication layer near the dead layer and exponential light doping on the side near the depletion region can improve the built-in electric field structure and increase the lifetime of the multiplied electrons, thereby improving the charge collection efficiency of EBCMOS. The optimized device achieves a charge collection efficiency of 94.48% at an incident electron energy of 4 keV, an electron beam diameter of 20 nm, a dead layer thickness of 60 nm, and a P-type silicon epitaxial layer thickness of 10 μm. © 2022 Xulei Qin et al.

关键词： Electric fields

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Outgassing Rates and Compositions of the Released Gases from Optical Fiber Panel and Photocathode Glass Used for low-light-level Image Intensifiers 10

Outgassing Rates and Compositions of the Released Gases from...

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10th Annual International Conference on Material science and Environmental Engineering, MSEE 2022

作者： Guo, Xin Pang, Yan Deng, Ningkang Yuan, Yuan Hu, Wenbo Bu, Renan Science and Technology on Low-Light-Level Night Vision Laboratory No. 24 3rd Zhangba Road Xi'an710065 China Key Laboratory for Physical Electronics and Devices of the Ministry of Education School of Electronic Science and Engineering Xi'An Jiaotong University No. 28 West Xianning Road Xi'an710049 China

To analyze the vacuum failure mechanism of low-light-level image intensifiers in depth, the outgassing rates and compositions of the released gases from optical fiber panel and photocathode glass used for the image intensifiers were investigated by static pressure-rising method and residual gas analysis. The investigation results show that the outgassing rate of the optical fiber panel at a baking temperature of 150°C is only about one order of magnitude higher than that at 23°C, while the outgassing rate of the photocathode glass at 150°C is about two orders of magnitude higher than that at 23°C. As the static accumulation time of gas releasing extends, the outgassing rate of the optical fiber panel linearly increases at 23°C, and it remains basically unchanged at 150°C, while for the photocathode glass, its outgassing rate increases rapidly firstly and then tends to be stable gradually both at 23°C and 150°C. The gas compositions released from the optical fiber panel and photocathode glass at 23°C mainly include H2O, H2, N2/CO and CO2. After experiencing the vacuum baking at 150°C, the releasing ratio of H2O gas from the optical fiber panel decreased just slightly, which indicates that the vacuum baking degassing for the photocathode glass is relatively difficult;by contrast, the releasing ratio of H2O gas from the photocathode glass significantly decreased, and that of H2 gas obviously increased. These results can provide experimental bases for further optimizing the component materials and fabrication process of low-light-level image intensifiers. © Published under licence by IOP Publishing Ltd.

关键词： Optical fibers

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