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IEEE Electron Device Letters 2025年

作者： Wang, Zhanren Jiang, Xiaolong Meng, Wenhao Guo, Menghui Huang, Zhiwei Liu, Guanzhou Zhou, Jinrong Ke, Shaoying Minnan Normal University Key Laboratory of Light Field Manipulation and System Integration Applications in Fujian Province School of Physics and Information Engineering Zhangzhou363000 China

In this study, a novel approach for fabricating Ge/Si APDs using high-vacuum in-situ sputtering bonding technology is presented. By introducing a 3 nm thick amorphous Si (a-Si) at the Ge/Si bonded interface, the lattice mismatch is effectively mitigated, significantly improving the bonding quality and enhancing carrier transport efficiency. Through a combination of sputtering, etching, and photolithography techniques, Ge/Si APDs with diameters of 70 μm and 100 μm are successfully fabricated, incorporating a separation absorption charge multiplication layer structure. It is demonstrated that the Ge/Si APDs exhibit exceptional performance under 1310 nm wavelength illumination, with gains reaching 4.8×104 and 1.1×105 for the 70 μm and 100 μm devices, respectively. Moreover, the devices maintain stability at extreme temperatures up to 500 K, highlighting their potential for weak light detection in harsh environments. © 1980-2012 IEEE.

关键词： Lattice mismatch

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Observation of higher-order deterministic optical vortices from random vortex beams

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APL Photonics 2025年第4期10卷

作者： Liu, Yonglei Xu, Siyu Peng, Peipei Zhang, Yongtao Dai, Siting Chen, Yahong Cai, Yangjian Wang, Fei School of Physical Science and Technology Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow University Suzhou215006 China School of Intelligent Manufacturing and Smart Transportation Suzhou City University Suzhou215104 China Key Laboratory of Light Field Manipulation and System Integration Applications in Fujian Province School of Physics and Information Engineering Minnan Normal University Zhangzhou363000 China Shandong Provincial Engineering and Technical Center of Light Manipulation Shandong Provincial Key Laboratory of Optics and Photonic Devices School of Physics and Electronics Shandong Normal University Jinan250014 China Joint Research Center of Light Manipulation Science and Photonic Integrated Chip of East China Normal University Shandong Normal University East China Normal University Shanghai200241 China Suzhou Key Laboratory of Intelligent Photoelectric Perception Soochow University Suzhou215006 China

Optical vortices in coherent beams have been identified as spiral phases with intensity nulls at singularities, while in random beams, they appear as coherence vortices in correlation functions, often not matching intensity nulls. Observing deterministic optical vortices in random beams is challenging due to their randomness. In this work, we propose a scheme relying on spatial coherence engineering and fractional Fourier transform to design a partially coherent light source capable of generating deterministic optical vortices at specific propagation distances in free space. At other propagation distances (including the source plane), the beam may exhibit coherence vortices characterized by spatially coupled two-point correlations, while deterministic vortices emerge only at designated distances. We show that both the topological charge and the axial position of the deterministic vortex are determined by the coherence parameters of the light source. Using a random-mode superposition approach, we experimentally synthesize such partially coherent light sources and characterize both coherence vortices and deterministic phase vortex through measurements of the four-dimensional correlation function at different propagation distances. In addition, we study the coherence phase orbital angular momentum (OAM) spectrum of the random beam both theoretically and experimentally. Our results reveal that the phase OAM spectrum is pure when the random beam carries a deterministic vortex, whereas for coherence vortices, the phase OAM spectrum is non-pure. This study provides a pathway for understanding and controlling the transition between deterministic phase vortices and coherence vortices, with potential applications in optical communication and metrology. © 2025 Author(s).

关键词： Optical design

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A Traffic Sign Recognition Method Based on Improved VGGNet Model 2

A Traffic Sign Recognition Method Based on Improved VGGNet M...

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2nd International Conference on Artificial Intelligence, Human-Computer Interaction and Robotics, AIHCIR 2023

作者： Song, Jianhua Fan, Yazhuo School of Physics and Information Engineering Minnan Normal University Key Laboratory of Light Field Manipulation and System Integration Applications in Fujian Province Zhangzhou China

ISBN: (纸本)9798350360363

Traffic sign recognition is one of the key technologies in auto drive system. In recent years, with the wide application of convolutional neural network, the recognition effect has made great progress. However, the current popular networks still have shortcomings in lightweight and recognition accuracy. An improved Visual Geometry Group network (VGGNet) model is proposed in this paper based on the VGGNet, which achieves the goal of extracting fine features and network lightweight by adjusting the structure and number of convolutional layers. The proposed network was trained and tested on the German traffic sign database, and the recognition accuracy reached 98.8%. © 2023 IEEE.

关键词： Traffic signs

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A Reverse Path Planning Approach for Enhanced Performance of Multi-Degree-of-Freedom Industrial Manipulators

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Computer Modeling in Engineering & Sciences 2024年第5期139卷 1357-1379页

作者： Zhiwei Lin Hui Wang Tianding Chen Yingtao Jiang Jianmei Jiang Yingpin Chen Key Laboratory of Light Field Manipulation and System Integration Applications in Fujian Province School of Physics and Information EngineeringMinnan Normal UniversityZhangzhou363000China Department of Electrical and Computer Engineering University of NevadaLas Vegas89154USA College of Material Engineering Fujian Agriculture and Forestry UniversityFuzhou350000China

In the domain of autonomous industrial manipulators,precise positioning and appropriate posture selection in path planning are pivotal for tasks involving obstacle avoidance,such as handling,heat sealing,and *** Multi-Degree-of-Freedom(MDOF)manipulators offer kinematic redundancy,aiding in the derivation of optimal inverse kinematic solutions to meet position and posture requisites,their path planning entails intricate multiobjective optimization,encompassing path,posture,and joint motion *** satisfactory results in practical scenarios remains *** response,this study introduces a novel Reverse Path Planning(RPP)methodology tailored for industrial *** approach commences by conceptualizing the manipulator’s end-effector as an agent within a reinforcement learning(RL)framework,wherein the state space,action set,and reward function are precisely defined to expedite the search for an initial collision-free *** enhance convergence speed,the Q-learning algorithm in RL is augmented with ***,we formulate the cylindrical bounding box of the manipulator based on its Denavit-Hartenberg(DH)parameters and propose a swift collision detection ***,the motion performance of the end-effector is refined through a bidirectional search,and joint weighting coefficients are introduced to mitigate motion in high-power *** efficacy of the proposed RPP methodology is rigorously examined through extensive simulations conducted on a six-degree-of-freedom(6-DOF)manipulator encountering two distinct obstacle configurations and target *** results substantiate that the RPP method adeptly orchestrates the computation of the shortest collision-free path while adhering to specific posture constraints at the target ***,itminimizes both posture angle deviations and joint motion,showcasing its prowess in enhancing the operational performance of MDOF industrial manipulators.

关键词： Reverse path planning Dyna-Q bidirectional search posture angle joint motion

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A Traffic Sign Recognition Method Based on Improved VGGNet Model

A Traffic Sign Recognition Method Based on Improved VGGNet M...

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Artificial Intelligence, Human-Computer Interaction and Robotics (AIHCIR), International Conference on

作者： Jianhua Song Yazhuo Fan Key Laboratory of Light Field Manipulation and System Integration Applications in Fujian Province School of Physics and Information Engineering Minnan Normal University Zhangzhou China

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An Enhanced Particle Swarm Algorithm Based on Fitness Landscape Information 13

An Enhanced Particle Swarm Algorithm Based on Fitness Landsc...

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13th IEEE Congress on Evolutionary Computation, CEC 2024

作者： Diao, Zhenya Yu, Fei Guan, Jian Liu, Meitong School of Physics and Information Engineering Minnan Normal University Key Lab of Intelligent Optimization and Information Processing Zhangzhou36300 China School of Physics and Information Engineering Minnan Normal University Key Laboratory of Light Field Manipulation and System Integration Applications in Fujian Province Key Lab of Intelligent Optimization and Information Processing Zhangzhou36300 China

ISBN: (纸本)9798350308365

In the original Particle Swarm Optimization (PSO), the selection of parameters significantly impacts the search capability of PSO. The paper introduces an innovative algorithm called Fitness Landscape-based PSO (FLPSO) to address the impact of parameter selection on the search capability of PSO. The algorithm focuses on acquiring fitness landscape information and analyzing the population state to intelligently select appropriate parameters in each generation. FLPSO defines four primary states: exploration, exploitation, convergence, and escaping state. In the convergence state, an elite learning strategy is incorporated to help the algorithm escape potential local optima by targeting the global best particle. To validate the efficacy of FLPSO, the paper conducted experiments on 30 different characteristic test functions from CEC2017. FLPSO was compared with six existing algorithms: PSO, PSO-TVAC, APSO, AWPSO, RPSO and ASRPPSO. The experimental results showed significant improvements in FLPSO, providing promising evidence for its effectiveness. © 2024 IEEE.

关键词： Particle swarm optimization (PSO)

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Correction to: Application of visible light polarization imaging in normal temperature measurement (Journal of Optics, (2024), 10.1007/s12596-024-02014-6)

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Journal of Optics (India) 2024年 1-1页

作者： He, Zhimin Zhu, Jiayi Huang, Cheng Zeng, Jun Chen, Fuchang Yu, Chaoqun Li, Yan Lin, Huichuan Chen, Huanting Zhang, Yongtao Pu, Jixiong Key Laboratory of Light Field Manipulation and System Integration Applications in Fujian Province College of Physics and Information Engineering Minnan Normal University Zhangzhou363000 China Fujian Provincial Key Laboratory of Light Propagation and Transformation College of Information Science and Engineering Huaqiao University Xiamen361021 China

In this article the funding grant number was omitted. The funding grant number submitted in the submission system include the following: National Natural Science Foundation of China (NSFC), grant numbers 61975072 and 12174173;Natural Science Foundation of fujian province, grant numbers 2022H0023, 2022J02047, ZZ2023J20, 2022G02006, and MSPY2022010. The original article has been corrected. © The Author(s), under exclusive licence to The Optical Society of India 2024.

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An Enhanced Particle Swarm Algorithm Based on Fitness Landscape Information

An Enhanced Particle Swarm Algorithm Based on Fitness Landsc...

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Congress on Evolutionary Computation

作者： Zhenya Diao Fei Yu Jian Guan Meitong Liu Key Lab of Intelligent Optimization and Information Processing School of Physics and Information Engineering Minnan Normal University Zhangzhou China Key Laboratory of Light Field Manipulation and System Integration Applications in Fujian Province Key Lab of Intelligent Optimization and Information Processing School of Physics and Information Engineering Minnan Normal University Zhangzhou China

ISBN: (数字)9798350308365

ISBN: (纸本)9798350308372

关键词： Sociology Particle swarm optimization Statistics Convergence

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Investigation of Optical Polarization Characteristics of Ultraviolet-C Algan Multiple Quantum Wells by Angle-Resolved Cathodoluminescence

SSRN

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SSRN 2024年

作者： Gong, Honglin Zhu, Lihong Cai, Yaqi Yang, Renlong Guo, Weijie Chen, Huanting Chen, Zhong Lu, Yijun National Innovation Platform for the Fusion of Industry and Education in Integrated Circuits Department of Electronic Science School of Electronic Science and Engineering Xiamen University Xiamen361005 China Key Laboratory of Light Field Manipulation and System Integration Applications in Fujian Province School of Physics and Information Engineering Minnan Normal University Zhangzhou363000 China

AlGaN-based ultraviolet-C (UV-C) light-emitting diodes (LEDs) face challenges related to their extremely low external quantum efficiency, which is predominantly attributed to the remarkably inadequate transverse magnetic (TM) light extraction efficiency (LEE). In this study, we employ angle-resolved cathodoluminescence (ARCL) spectroscopy to assess the optical polarization of (0001)-oriented AlGaN multiple quantum well (MQW) structures in UV-C LEDs, in conjunction with a focused ion beam and scanning electron microscopy (FIB/SEM) system to etch samples with various inclination angles (θ) of sidewall. This technique effectively distinguishes the spatial distribution of TM- and transverse electric (TE)-polarized photons contributing to the luminescence of the MQW structure. CL spectroscopy confirms that UV-C LEDs with a θ of 35° exhibit the highest CL signal compared to samples with other θ. Furthermore, we establish a model using Finite Difference Time Domain (FDTD) simulation to validate the mechanism of the outcomes. The complementary contribution of TM and TE photons at different specific angles are distinguished by ARCL and confirmed by simulation. At angles near the sidewall, the CL is dominated by the TM photons, which mainly contribute to the increased LEE and the decreased degree of polarization (DOP) to make the spatial distribution of CL more uniform. Additionally, this method allows us to analyze the polarization of light without the need for polarizers, enabling the differentiation of TE and TM modes. This distinction provides flexibility for selecting different emission mode based on various application requirements. The presented approach not only opens up new opportunities for enhanced UV-C light extraction but also provides valuable insights for future endeavors in device fabrication and epitaxial film growth. © 2024, The Authors. All rights reserved.

关键词： light emitting diodes

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Spin-orbit interactions of the twisted random light

arXiv

引用

arXiv 2024年

作者： Li, Benli Chen, Yahong Deng, Weimin Wang, Tongbiao Wan, Lipeng Yu, Tianbao School of Physics and Material Science Nanchang University Nanchang330031 China Jiangxi Provincial Key Laboratory of Photodetectors School of Physics and Materials Science Nanchang University Nanchang330031 China School of Physical Science and Technology Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow University Suzhou215006 China Key Laboratory of Light Field Manipulation and System Integration Applications in Fujian Province Minnan Normal University Zhangzhou363000 China

The twist phase of random light represents a nontrivial two-point phase, endowing the field with orbital angular momentum. Although the mutual transition of the spin and orbit angular momenta of coherent light has been revealed, the relationship between spin-orbital angular momentum interaction (SOI) and the twist phase has remained unexplored. This is because of the stochastic nature of random light, making it challenging to explore the properties of angular momenta that rely on well-defined spatial and polarization structures. This study addresses this gap from the view of the asymmetry coherent-mode decomposition for twisted random light to gain insight into the intricate interplay between the twist phase and the SOI within a tight focusing system. Our findings reveal that spin and orbit angular momentum transitions occur in the tightly focused twisted random light beam, yielding the transverse spin density controlled by the twist phase. This effect becomes more pronounced when the spin of random light and the chirality of the twist phase are the same. Our work may find significant applications in optical sensing, metrology, and quantum optics. © 2024, CC BY-NC-SA.

关键词： Quantum optics

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