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IEEE Electron Device Letters 2025年第5期46卷 681-684页

作者： Su, Kai Wang, Wei Liu, Chang Zhang, Jinfeng Ren, Zeyang Zhang, Yachao Zhang, Jincheng Ouyang, Xiaoping Bao, Weimin Hao, Yue Xidian University State Key Laboratory of Wide Bandgap Semiconductor Devices and Integrated Technology Faculty of Integrated Circuit Xi'an710071 China Xidian-Wuhu Research Institute Wuhu241002 China Northwest Institute of Nuclear Technology Xi'an710024 China Xidian University School of Aerospace Science and Technology Xi'an710071 China

This letter reports the polycrystalline diamond (PCD) dosimeter with near ideal linearity and high sensitivity to meet the application requirements of medical X-ray dose measurement for low cost, large size, and high performance. The device is fabricated by using hydrogen termination modulation ohmic contact and high-quality materials with preferred (111) and (311) crystal orientation, large grain size and low impurity content. The linearity, specific sensitivity, and current gain obtained from experimental measurements are 0.999, 1.482~μ Cċ Gy-1ċ mm-3 and 5.76 at 300 V (1 V/μ m), respectively. Furthermore, the signal-to-noise ratio that meets the requirements of International Atomic Energy Agency is greater than 104 at 5 to 300 V, and the current fluctuations under dynamic voltage switch test condition of more than 30 cycle (2 s on-state and 1 s off-state) is only 0.241% at 200 V under dose rate of 6.184 Gy/min. This study indicates that PCD dosimeter fabricated by optimizing contact structure and material properties has a great potential for medical dose measurement. © 1980-2012 IEEE.

关键词： Crystal orientation

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Adjusting frequency response characteristics of fiber optic accelerometers using electromagnetic feedback technology

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Optics Express 2025年第9期33卷 19235-19246页

作者： An, Ran Ping, Xinyang Yang, Jun Yuan, Yonggui Wen, Kunhua Wang, Shun Wang, Yuncai Qin, Yuwen Key Laboratory of In-Fiber Integrated Optics of Ministry of Education College of Physics and Optoelectronic Engineering Harbin Engineering University Harbin150001 China Key Laboratory of Photonic Materials and Devices Physics for Oceanic Applications Ministry of Industry and Information Technology of China College of Physics and Optoelectronic Engineering Harbin Engineering University Harbin150001 China Institute of Advanced Photonics Technology School of Information Engineering Guangdong University of Technology Guangzhou51006 China Key Laboratory of Photonic Technology for Integrated Sensing and Communication Ministry of Education of China Guangdong University of Technology Guangzhou510006 China Guangdong Provincial Key Laboratory of Information Photonics Technology Guangdong University of Technology Guangzhou510006 China School of Physics and Optoelectronic Engineering Guangdong University of Technology Guangzhou510006 China

A control method of electromagnetic feedback is proposed for adjusting frequency response characteristics of fiber optic accelerometers, which could expand the flat working bandwidth and enhance performance consistency. The proof sensor employs an open-loop disc-type vibration pickup structure, cascaded with an electromagnetic feedback control unit. A proportional-differential control algorithm is utilized to generate the feedback signal, which ultimately acts on the input side of the sensor. Experimental results show that the 3 dB bandwidth of the constructed closed-loop system is expanded to approximately 210 Hz, more than 3.5 times that of the open-loop system, while maintaining a sensitivity of 72.97 dB re rad/g. Furthermore, the regulated closed-loop systems exhibit a significantly reduced response deviation, compared to the open-loop systems with fluctuating response characteristics due to fabrication errors. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Accelerometers

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Measurement of white light semiconductor laser junction temperature based on center-of-mass wavelength and integration width 4

Measurement of white light semiconductor laser junction temp...

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4th International Conference on Advanced Manufacturing technology and Electronic Information, AMTEI 2024

作者： Jiang, Yongsheng Jing, Lei Tong, Zhengrong Li, Peng Wang, Xue Wang, Hao Tian, Ye Wang, Zhonghan Tianjin Key Laboratory of Thin Film Electronics and Communication Devices Engineering Research Center for Optoelectronic Devices and Communication Technology the Ministry of Education Department of Integrated Circuit Engineering Tianjin University of Technology Tianjin300384 China

ISBN: (数字)9781510688247

ISBN: (纸本)9781510688230

Junction temperature is an important parameter affecting semiconductor lasers, and accurate and fast measurement of junction temperature is crucial for thermal design and performance inspection of semiconductor laser products. The spectra of white light semiconductor laser were measured under different driving currents and different ambient temperatures, and the effects of current and temperature on white light laser spectra were analyzed. Through the connection between junction temperature, driving current, center-of-mass wavelength, and integration width, the relationship graph of the four is constructed. The corresponding junction temperature can be obtained by combining the relationship graph with the characteristic parameters of the spectral distribution of the white light laser in the actual working state. The experimental results show that, compared with the peak wavelength method, the average error of the measurement of this method is 1.82 ℃, which is a fast, accurate, low-cost and contact-free method for the measurement of the junction temperature of white light semiconductor laser. © 2025 SPIE.

关键词： Photonics

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Visible light positioning system based on an improved weighted k-nearest neighbor algorithm 4

Visible light positioning system based on an improved weight...

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4th International Conference on Advanced Manufacturing technology and Electronic Information, AMTEI 2024

作者： Tian, Ye Jing, Lei Tong, Zhengrong Li, Peng Wang, Xue Wang, Hao Wang, Zhonghan Jiang, Yongsheng Tianjin Key Laboratory of Thin Film Electronics and Communication Devices Engineering Research Center for Optoelectronic Devices and Communication Technology the Ministry of Education Department of Integrated Circuit Engineering Tianjin University of Technology Tianjin300384 China

ISBN: (数字)9781510688247

ISBN: (纸本)9781510688230

Traditional K-Nearest Neighbors (KNN) and Weighted K-Nearest Neighbors (WKNN) algorithms face challenges due to the fixed selection of the K value. To address this issue, we propose a new algorithm that combines Genetic Algorithm (GA) with WKNN, referred to as GA-WKNN. The GA algorithm optimizes and adjusts the K value, thereby reducing errors in the visible light positioning system. Experimental results show that the GA-optimized WKNN significantly improves localization accuracy compared to traditional methods with a fixed K value. This optimization strategy allows the positioning system to more accurately determine the actual position. © 2025 SPIE.

关键词： Genetic algorithms

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Experimental Study of Heavy Ion Irradiation Hardness for p-GaN HEMTs Under Off-State With Negative Gate Voltage

IEEE Electron Device Letters

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IEEE Electron Device Letters 2025年第5期46卷 709-712页

作者： Xie, Xintong Sun, Shuxiang Shen, Jingyu Liu, Renkuan Deng, Gaoqiang Yang, Cheng Zhou, Xin Wei, Jie Zhang, Bo Luo, Xiaorong University of Electronic Science and Technology of China State Key Laboratory of Electronic Thin Films and Integrated Devices Chengdu610054 China Company Ltd. Chongqing401331 China Chengdu University of Information Technology College of Microelectronics Chengdu610225 China

In this work, it is demonstrated for the first time that a negative gate voltage (VGS) during off-state can enhance the single-event effect (SEE) hardness of the 100-V E-mode p-GaN HEMTs. When subjected to irradiation from Ta ions with linear energy transfer of 78.40 MeV/(mg/cm2), the single-event transient (SET) current peak during irradiation can be significantly decreased if a negative VGS is applied, as opposed to using zero VGS. Furthermore, a negative VGS suppresses post-irradiation shifts in gate capacitance (CG ), threshold voltage (Vth) and off-state drain leakage current (IDSS), indicating improved stability against SEE. Numerical simulations have been performed to offer a physical insight into the underlying mechanisms. It is found that a negative VGS enables the simultaneous removal for radiation-induced holes and thus suppresses the SET current. The post-irradiation degradation of CG , Vth and IDSS are attributed to the radiation-induced acceptor-like traps at the Schottky junction, the AlGaN/GaN interface and the buffer layer, respectively. © 1980-2012 IEEE.

关键词： Gallium nitride

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Temperature-insensitive liquid level sensor based on U-shaped SMF

Temperature-insensitive liquid level sensor based on U-shape...

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2024 International Conference on Optoelectronic Materials and devices, ICOMD 2024

作者： Wang, Muhua Tong, Zhengrong Zhang, Weihua Tianjin Key Laboratory of Thin Film Electronics and Communication Devices Engineering Research Center for Optoelectronic Devices and Communication Technology The Ministry of Education School of Integrated Circuit Science and Engineering Tianjin University of Technology Tianjin300384 China

ISBN: (数字)9781510689046

ISBN: (纸本)9781510689039

In this manuscript, a fiber optic sensor based on a U-shaped single mode fiber (SMF) is proposed for liquid level measurement. The U-shaped structure is fabricated by flame burning method. The U-shaped structure leads to energy leakage into the cladding, resulting in modal interference, and the sensor becomes more sensitive to external changes. The experimental results show that the level sensitivity is as high as 255.86 pm/mm in the range of 0-30 mm. The sensor exhibits temperature insensitivity in the range of 20-70 °C. The sensor avoids the problem of temperature crosstalk and is ideal for liquid level measurement. © 2025 SPIE.

关键词： Single mode fibers

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Research on high accuracy classification of temperature signals based on OFDR technology and EfficientNet 4

Research on high accuracy classification of temperature sign...

引用

4th International Conference on Advanced Manufacturing technology and Electronic Information, AMTEI 2024

作者： Shang, Chuanyin Li, Peng Tong, Zhengrong Wang, Hao Li, Sibo Tianjin Key Laboratory of Thin Film Electronics and Communication Devices Engineering Research Center for Optoelectronic Devices and Communication Technology the Ministry of Education School of Integrated Circuit Science and Engineering Tianjin University of Technology Tianjin300384 China

ISBN: (数字)9781510688247

ISBN: (纸本)9781510688230

The development of machine learning is driving revolutionary changes and unprecedented opportunities across various industries. This paper introduces a new temperature monitoring method that combines the efficient deep learning model EfficientNet with Optical Frequency Domain Reflectometry (OFDR). We utilize distributed fiber-optic sensing technology based on OFDR to collect one-dimensional temperature signals under different temperature conditions, which we then transform into a two-dimensional image format suitable for machine learning processing. The dataset is subsequently trained using the EfficientNet deep learning model. The results show that the trained model achieves a high accuracy rate of 97.5% on the test dataset. This research not only demonstrates the feasibility of efficiently and accurately monitoring temperature changes but also provides new solutions and technological pathways for areas such as environmental monitoring, industrial automation, and safety systems. © 2025 SPIE.

关键词： Education and training Data modeling Performance modeling Fiber optics sensors Machine learning Matrices Fiber optics Image processing Reliability Signal processing

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Angle-Multiplexed Terahertz Frequency-Selective Fingerprint Sensor: Broadband Identification of Chiral Enantiomers 38

Angle-Multiplexed Terahertz Frequency-Selective Fingerprint ...

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38th IEEE International Conference on Micro Electro Mechanical Systems, MEMS 2025

作者： Sun, Hongshun Cao, Yunhao Chen, Yusa Li, Liye Ma, Lijun Jin, Shengxiao Gu, Guodong Feng, Zhihong Wu, Wengang Peking University National Key Laboratory of Advanced Micro and Nano Manufacture Technology School of Integrated Circuits Beijing China National Key Laboratory of Science and Technology on Space Microwave Cast Xi'an China National Key Laboratory of Solid-State Microwave Devices and Circuits Shijiazhuang China

ISBN: (纸本)9798331508890

Chiral enantiomers exhibit distinct pharmacological and pharmacokinetic properties, which must be strictly detected to avoid any adverse effects on the human body. Conventional terahertz (THz) detection methods present a significant challenge in trace amount analysis and broadband detection of analytes. Guided-mode resonance (GMR) metasurfaces are employed to enhance light-matter interaction, and a THz wave-angle scanning method is proposed for the successful identification of chiral glutamic. This method involves adjusting the incidence angle (20°-45°) to enhance broadband signals (0.95-1.45 THz) for molecular fingerprinting. The study provides a method for highly sensitive and versatile miniature THz spectroscopic devices. © 2025 IEEE.

关键词： Terahertz waves

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Investigation on influence of gamma irradiation on piezoelectric and resonance characteristics of surface acoustic wave resonators 5

Investigation on influence of gamma irradiation on piezoelec...

引用

5th International Conference on Mechanical Engineering and Materials, ICMEM 2024

作者： Sun, Lei Peng, Bin Yang, Yuntao Sun, Zhaofeng Zhu, Jialiang Zhang, Wanli State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China Chengdu China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu China

ISBN: (数字)9781510688971

ISBN: (纸本)9781510688964

In this work, an evaluation towards influence of high-dose gamma irradiation on surface acoustic wave (SAW) resonators, is reported. The single-port SAW resonators are fabricated using Lithium niobate (LiNbO3) and Catangasite (CTGS, Ca3TaGa3Si2O14) substrates, along respective cut directions of (0º, 38º, 0º) and (0º, 90º, 0º). Piezoelectric coefficient of substrates, and several main resonance parameters covering resonance frequency, amplitude of resonance peak in reflection coefficient, quality factor together with electromechanical coupling factor of manufactured SAW resonators are investigated, as suitable representatives of piezoelectric and resonance characteristics of SAW resonators. After exposure to gamma ray with a maximum dose of 250 kGy, substrates show insignificant variation not exceeding 6% in their piezoelectric coefficient. Meanwhile, resonance parameters of SAW resonators also alter slightly. Such excellent stability of these characteristics demonstrates credible irradiation hardness owned by both SAW resonators. Results in this study can provide supportive references for usage of LiNbO3 and CTGS-based SAW devices in harsh environments. © 2025 SPIE.

关键词： Gamma rays

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Clean assembly of van der Waals heterostructures using microdome polymer with an h-BN sacrificial layer

Clean assembly of van der Waals heterostructures using micro...

引用

2024 International Conference on Optoelectronic Materials and devices, ICOMD 2024

作者： Wen, Shaofeng Zhang, Rui Zhou, Shuren Lan, Changyong Li, Chun State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Science and Engineering University of Electronic Science and Technology of China Chengdu611731 China

ISBN: (数字)9781510689046

ISBN: (纸本)9781510689039

Van der Waals (vdW) heterostructures are fabricated by layer-by-layer assembly of individual two-dimensional (2D) materials, offering great potential for various optoelectronic devices. However, conventional assembly techniques often involve direct contact between the polymer supports and the materials, leading to contamination that degrades device performance. Here, we report a novel dry transfer technique using a microdome polymer (MDP) with a sacrificial layer for assembling van der Waals heterostructures. A dimethylpolysiloxane (PDMS)-based MDP is covered with a polyvinyl chloride (PVC) adhesion layer. The presence of the sacrificial layer allows for the fabrication of the device without the polymer coming into direct contact with the heterostructures. The resulting heterostructures have high-quality interfaces without interlayer contamination and superior photoelectronic behavior. Using this technique, we fabricated MoS2/WSe2 heterostructures, achieving a tenfold improvement in rectification ratio, responsivity, and response time, and a 3.3-fold improvement in Ilight/Idark ratio compared to the conventional transfer technique. © 2025 SPIE.

关键词： Van der Waals forces

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