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Deep learning-based scattering removal of light field imaging

Chinese Optics Letters 2022年第4期20卷 16-22页

作者： Weihao Wang Xing Zhao Zhixiang Jiang Ya Wen Institute of Modern Optics Nankai UniversityTianjin 300350China Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Tianjin 300350China

Light field imaging has shown significance in research fields for its high-temporal-resolution 3D imaging ***,in scenes of light field imaging through scattering,such as biological imaging in vivo and imaging in fog,the quality of 3D reconstruction will be severely reduced due to the scattering of the light field *** this paper,we propose a deep learning-based method of scattering removal of light field *** this method,a neural network,trained by simulation samples that are generated by light field imaging forward models with and without scattering,is utilized to remove the effect of scattering on light fields captured *** the deblurred light field and the scattering-free forward model,3D reconstruction with high resolution and high contrast can be *** demonstrate the proposed method by using it to realize high-quality 3D reconstruction through a single scattering layer experimentally.

关键词： computational imaging light field imaging scattering imaging deep learning

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Generation and time jitter of the loose soliton bunch in a passively mode-locked fiber laser

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Chinese Optics Letters 2017年第8期15卷 26-29页

作者：王振洪王志刘艳格贺瑞敬王光斗杨光韩思濛 Key Laboratory of Optical Information and Technology Ministry of EducationTianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology and Institute of Modern Optics Nankai University Tianjin 300350 China

Passively mode-locked fiber lasers （PMLFLs） could be not only used as simple and economic ultrashort pulse sources but also as an ideal platform for exploring the nonlinear dynamics of dissipative solitons such as b... 详细信息

关键词： mode Generation and time jitter of the loose soliton bunch in a passively mode-locked fiber laser time

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Simulations of ultra-high sensitivity RI sensor in triple-core fiber with modified Vernier effect:Application in marine RI measurement

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optoelectronics Letters 2023年第8期19卷 481-486页

作者： XIONG Lingyi YU Yangfei DUAN Shaoxiang LIU Bo LIN Wei YAO Yuan Institute of Modern Optics Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network TechnologyNankai UniversityTianjin 300350China Marine Protected Area Administration of Sansha City Sansha 573100China Southern Marine Science and Engineering Guangdong Laboratory Zhuhai 519000China

We proposed an ultra-high sensitivity triple-core fiber refractive index(RI)sensor with a modified Vernier effect for marine RI measurement and demonstrated it by numerical *** sensor composes a pair of parallelized spatial mode Mach-Zehnder interferometers(MZIs),both of which are involved in sensing,but possess different interfering *** designing an MZI RI fiber optic sensor based on Vernier effect in air,it is demonstrated that in the low RI such as air environment,only the modes involved in sensing interference are affected by the environment to generate Vernier *** the high RI marine environment,both sensing interferometer and reference interferometer need to be affected by the ambient RI to generate Vernier *** simulation results indicate that the proposed novel sensing structure can amplify its sensitivity from-15428 nm/RIU to-24857 nm/RIU in the marine environment.

关键词： interferometer fiber effect

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Adaptive Detection of Frequency-Hopping Spread Spectrum Signals Based on Compressed Measurements and Artificial Neural networks 5

Adaptive Detection of Frequency-Hopping Spread Spectrum Sign...

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5th IEEE Advanced Information technology, Electronic and Automation Control Conference, IAEAC 2021

作者： Huang, Yuang Meng, Xuedong Zhang, Shuang Liu, Feng Nankai University College of Electronic Information and Optical Engineering Tianjin China Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Nankai University Tianjin China

In modern secure communications, the frequency-hopping spread spectrum (FHSS) technique has been widely implemented. In this technique, the signal carrier frequency hops in a pseudo-random manner, and the conventional non-cooperative receivers without the knowledge of the hopping sequence have to sample the signals with relatively expensive hardware to catch the entire spectrum. Thus, the FHSS signals usually get good performance against interception. In this paper, the authors propose a non-cooperative method to detect the FHSS signals from compressive measurements. In contrast to most of the existing literature on compressive sampling, which proposed to use random or recursively optimized measurement kernels, the proposed method enable efficient adaptive measurement kernel design based on task-specific information optimization and artificial neural networks. Simulation results demonstrate that the proposed method provides significantly improved detection accuracy over the compressive detection method with random kernels, as well as significantly improved measurement kernel designing efficiency over the recursive optimization method in the existing literature. © 2021 IEEE.

关键词： Neural networks

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An on-line fiber cutting-welding method for the fabrication of Fabry-Perot micro-cavity

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optoelectronics Letters 2020年第4期16卷 248-251页

作者： WU Ji-xuan WANG Qian SONG Bin-bin CUI Guang-huan LIU Bo ZHANG Hao ZHANG Cheng ZHANG Shan-shan DUAN Shao-xiang BAI Hua Tianjin Key Laboratory of Optoelectronic Detection Technology and Systems Tianjin Key Laboratory of Engineering Technologies for Cell PhamaceuticalCollege of Electronic and Information EngineeringTiangong UniversityTianjin 300387China Key Laboratory of Computer Vision and Systems Ministry of EducationSchool of Computer Science and EngineeringTianjin University of TechnologyTianjin 300384China Key Laboratory of Optoelectronic Sensor and Sensing Network Technology College of Electronic Information and Optical EngineeringNankai UniversityTianjin 300350China

A Fabry-Perot micro-cavity is fabricated by on-line fiber cutting-welding *** asymmetrical fiber Fabry-Perot micro-cavity is designed and produced by cutting a standard single-mode fiber and welding the fiber end with the core-offset *** length of the Fabry-Perot micro-cavity could be controlled within a certain range of accuracy based on the on-line fiber cutting-welding *** to this method,a micro-machined Fabry-Perot micro-cavity with a length of about 147μm is achieved and its spectral characteristic is also investigated in our *** proposed method is suitable to produce a micro-fiber-optic structure with improved and controlled precision,which is attractive for the fiber processing ***,the fabricated Fabry-Perot micro-cavity also has potential application in the microfluidic system and biochemical detection area.

关键词： fiber cavity welding

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Review of terahertz phase control devices based on liquid crystal integrated with microstructures or nanomaterials 10

Review of terahertz phase control devices based on liquid cr...

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10th International Symposium on Ultrafast Phenomena and Terahertz Waves, ISUPTW 2021

作者： Ji, Yunyun Fan, Fei Chang, Shengjiang Institute of Modern Optics Nankai University Tianjin Key Laboratory of Micro-scale Optical Information Science and Technology Tianjin300350 China Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Tianjin300350 China

ISBN: (纸本)9781510646933

Phase and polarization are the basic parameters of electromagnetic wave, which can not only carry useful electromagnetic information, but also manipulate the propagation and states of light. With the development of terahertz (THz) technology and its application system, high-performance THz phase control devices are urgently needed. Our recent research work on THz phase control devices based on liquid crystals integrating with artificial microstructures or nanomaterials was reviewed in this paper. The proposed dielectric metasurface can realize a polarization-dependent electromagnetically induced transparency effect with a large artificial birefringence and a negative-dispersion phase difference with large artificial anisotropy. The double-layer graphene gratings can achieve a switchable function to switch between linear-to-linear and linear-to-circular polarization states. On this basis, we presented to combine the artificial microstructures with liquid crystals for controllable THz phase shifters and broadband wave plates. Moreover, by using the strong interaction between liquid crystals and the electrically or magnetically sensitive nanomaterials, we proposed a series of high-efficiency control THz phase devices. This work has greatly promoted the development and practical application of THz phase and polarization control devices. © 2021 SPIE.

关键词： Microstructure

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Review on terahertz polarization sensing based on metasurface sensor 10

Review on terahertz polarization sensing based on metasurfac...

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10th International Symposium on Ultrafast Phenomena and Terahertz Waves, ISUPTW 2021

作者： Zhang, Ziyang Fan, Fei Li, Tengfei Zhong, Changzhi Ji, Yunyun Chang, Shangjiang Institute of Modern Optics Nankai University Tianjin Key Laboratory of Micro-scale Optical Information Science and Technology Tianjin300350 China Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Tianjin300350 China

ISBN: (纸本)9781510646933

Terahertz waves have a wide range of applications in the field of sensing because of their good coherence, high signal-noise ratio, low radiation energy, and non-ionization. In addition, THz sensing also has the advantages of real-time, non-contact, and label-free, so it has important application in biological sensing, especially in the sensing of active biological substances. But it also has some defects, such as low sensitivity, strong water absorption, limited detection information, and poor applicability. Herein, we propose a THz time-domain polarization spectroscopy (TDPS) sensing system. The metal metasurface structures are used as the sensor, and the transmission or reflection sensing method is used to detect the PVA thin film, tumor cell and amino acid solution respectively. The experimental results show that: Compared with the traditional resonant sensing method, the quality (Q) factor and figure of merit (FoM) of polarization sensing method are improved by at least 4∼5 times, so the sensing sensitivity is significantly improved. For tumor cell sensing, its minimum detection accuracy has reached 103 cells/ml. For amino acid solution sensing, the minimum detection accuracy is 10-5 g/ml magnitude. In addition, using the chiral metasurface structure as sensor, this method can also identify the difference between the chiral enantiomer solutions of amino acids. © 2021 SPIE.

关键词： Amino acids

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Towards single-molecule optoelectronic devices

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Science China Chemistry 2018年第11期61卷 1368-1384页

作者： Lijue Chen Anni Feng Maoning Wang Junyang Liu Wenjing Hong Xuefeng Guo Dong Xiang State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical Engineering Collaborative Innovation Center of Chemistry for Energy Materials Xiamen University Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Institute of Modern Optics College of Electronic Information and Optical Engineering Nankai University Beijing National Laboratory for Molecular Sciences State Key Laboratory for Structural Chemistry of Unstable and Stable SpeciesCollege of Chemistry and Molecular Engineering Peking University

Benefiting from the development of molecular electronics and molecular plasmonics, the interplay of light and electronic transport in molecular junctions has attracted growing interest among researchers in both fields, leading to a new research direction of "single-molecule optoelectronics". Here, we review the latest developments of photo-modulated charge transport,electroluminescence and Raman spectroscopy from single-molecule junctions, and suggest future directions for single-molecule optoelectronics.

关键词： molecular electronics molecular optoelectronics single-molecule junction

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Coverage Performance Analysis of Grid Distribution in Heterogeneous network

Coverage Performance Analysis of Grid Distribution in Hetero...

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2017 17th IEEE International Conference on Communication technology (ICCT 2017)

作者： Xueming Sui Hui Zhang Yuanhong Lv Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Nankai University

With the growth of wireless communication services, large base stations will not only produce a lot of electromagnetic radiation, but also bring huge energy consumption, resulting in a large number of greenhouse gases. The fifth generation mobile communication will deploy the macro base stations and the micro base stations in multi-layer heterogeneous network to enhance the system network performance, reducing the negative impact of abovementioned factors. According to the theory of cell communication, in this paper, by adding the micro base stations distributed in different grid modes in the surrounding area of the macro base station, the purpose is to maximize the total area covered by the base stations in the cell under the condition that the total power consumption of the base stations is not increased.

关键词： heterogeneous network base station distribution cellular network Voronoi diagram coverage performance

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Co-electrolysis of ethylene glycol and carbon dioxide for formate synthesis

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Science China Chemistry 2024年第5期67卷 1539-1544页

作者： Dongfeng Du Fusong Kang Shiru Yang Bin Shao Jingshan Luo Institute of Photoelectronic Thin Film Devices and Technology State Key Laboratory of Photovoltaic Materials and CellsKey Laboratory of Photoelectronic Thin Film Devices and Technology of TianjinMinistry of Education Engineering Research Center of Thin Film Photoelectronic TechnologyNankai UniversityTianjin 300350China Haihe Laboratory of Sustainable Chemical Transformations Tianjin 300192China Frontiers Science Center for New Organic Matter Nankai UniversityTianjin 300071China College of Electronic Information and Optical Engineering Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network TechnologyNankai UniversityTianjin 300350China

Co-electrolysis of waste plastics and carbon dioxide(CO_(2)) into value-added chemicals or fuels is a promising pathway for a sustainable society, but efficient and selective conversion remains a challenge. Herein, a gold-mediated nickel hydroxide(Au/Ni(OH)_(2)) is developed to oxidize waste plastic-derived ethylene glycol(EG) into formate. In-situ electrochemical experiments and theoretical results reveal that the introduction of Au favors the redox properties and EG adsorption behavior of Ni(OH)_(2). The Au/Ni(OH)_(2) catalyst shows an excellent formate selectivity of >90% at high current densities of above 100 m A cm^(-2). When coupled with sputtered bismuth(Bi) cathode for CO_(2) reduction, a high formate Faradic efficiency(FE) of 188.2% at 200 m A cm^(-2)and a good formate productivity of 7.33 mmol m^(-2)s^(-1)at 10 A are obtained in a flow cell and a zero-gap membrane electrode assembly(MEA) cell, respectively. This work demonstrates a promising strategy to convert waste plastics and CO_(2) into valuable products.

关键词： waste plastic upcycling ethylene glycol oxidation carbon dioxide reduction electrocatalysis formate synthesis

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