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International Conference on Microwave and Millimeter Wave technology Proceedings

作者： Shuang-Gen Zhang Tao Yu Yu-Lan Wang Ran Zhou Zhi-Hua Cheng Tianjin Key Laboratory of Film Electronic and Communication Devices Engineering Research Center of Optoelectronic Devices and Communication Technology Ministry of Education School of Integrated Circuit Science and Engineering Tianjin University of Technology Tianjin China

ISBN: (数字)9798350389968

ISBN: (纸本)9798350389975

In this paper, a broadband high-gain antenna for vehicle-mounted millimeter-wave radar is proposed. The antenna is mainly composed of two parts, including a 10- element series-fed millimeter-wave radar antenna and gradient- type one-four parallel power-dividing feed network. The tapered microstrip line is combined with a series feed power divider that generates traveling waves. By adjusting the width of the tapered line, the impedance of the transmission line can be linearly changed, allowing the antenna to be matched with the multi-resonant point impedance and enhancing the radiation bandwidth. The radiation bandwidth is improved. The results indicate that the operating frequency band of the radar antenna is 76.39∼84.2GHz, with a bandwidth of 7.81GHz. The antenna exhibits a gain of approximately 20.117dBi and a half power beam width of 11.2°. The proposed millimeter-wave radar antenna, based on the innovative gradient power divider network, offers significant potential in the field of automotive radar.

关键词： Power dividers Microstrip antenna arrays Bandwidth Microstrip antennas Millimeter wave radar Radar antennas Antenna feeds

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Review of advanced progress ofχ^(2)-based all-optical devices on thin-film lithium niobate

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Chinese Optics Letters 2023年第10期21卷 79-92页

作者：石磊宋元军唐杰秦妍妍薛小枚周桓立陈泽贤李选钱广张晓阳张彤 Joint International Research Laboratory of Information Display and Visualization School of Electronic Science and EngineeringSoutheast UniversityNanjing 210096China National Key Laboratory of Solid-State Microwave Devices and Circuits Nanjing 210016China Nanjing Electronic Devices Institute Nanjing 210016China Key Laboratory of Micro-Inertial Instrument and Advanced Navigation Technology Ministry of Educationand School of Instrument Science and EngineeringSoutheast UniversityNanjing 210096China Suzhou Key Laboratory of Metal Nano-Optoelectronic Technology Southeast University Suzhou CampusSuzhou 215123China

The technological innovation of thin-film lithium niobate(TFLN)is supplanting the traditional lithium niobate industry and generating a vast array of ultra-compact and low-loss optical waveguide devices,providing an unprecedented prospect for chip-scale integrated *** of its unique strong quadratic nonlinearity,TFLN is widely used to create new coherent light,which significantly promotes all-optical signal processes,especially in terms of ***,we review recent advances in TFLN,review the thorough optimization strategies of all-optical devices with unique characteristics based on TFLN,and discuss the challenges and perspectives of the developed nonlinear devices.

关键词： thin-film lithium niobate second-order nonlinearity nonlinear integrated optics

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Smart textiles for active ethanol concentration monitoring and speech recognition

Smart textiles for active ethanol concentration monitoring a...

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International Conference on Micro/Nano Sensors for AI, Healthcare, and Robotics (NSENS)

作者： Chunxu Chen Guangzhong Xie Yuanjie Su State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Science and Engineering University of Electronic Science and Technology of China Chengdu China

ISBN: (数字)9798350375213

ISBN: (纸本)9798350375220

The smart textile was constructed via electrospinning to synchronously coupled the piezoelectric transduction of polyvinylidene fluoride (PVDF) with the chemical resistance sensing of titanium dioxide (TiO 2 ), enabling autonomous monitoring of ethanol concentration and speech recognition. The prepared smart textile can detect 60 dB sound and generate an output voltage of 1.72 V when driven by 97 dB sound. At the same time, it responded to various types of sound waves in a wide range of frequencies producing corresponding voltage signal; these can be used to accurately identify complex sound signals with different frequencies and different intensities. In addition, the prepared smart textiles respond to ethanol at 50 ppm and 200 ppm to meet the detection needs of drunk driving. All the above features give smart textiles great potential in various applications such as microphones, biometrics, environmental protection and artificial intelligence.

关键词： Smart textiles Time-frequency analysis Ethanol Voltage Speech recognition Robot sensing systems Artificial intelligence

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Analysis on the Effect of Asymmetrically Distributed Slits to the Cross-Polarization of Unilateral and Bilateral Comb-Line Antennas

Analysis on the Effect of Asymmetrically Distributed Slits t...

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International Conference on Microwave and Millimeter Wave technology Proceedings

作者： Shuanggen Zhang Yulan Wang Tao Yu Xufeng Song Zhihua Cheng Tianjin Key Laboratory of Film Electronic and Communication Devices Engineering Research Center of Optoelectronic Devices and Communication Technology Ministry of Education School of Integrated Circuit Science and Engineering Tianjin University of Technology Tianjin China

ISBN: (数字)9798350389968

ISBN: (纸本)9798350389975

Excessive sidelobes in radar antennas lead to enormous interference to the radar, which reduces the reception efficiency. This article presents an analysis on the effect of asymmetrically distributed slits to the cross-polarization of unilateral and bilateral comb-line antennas. By adding rectangular slits in the middle of radiating elements using different widths, the different effects are compared. The rectangular slits diminish the transverse current of the radiating element, which reduces the cross-polarization. A 16-elements bilateral and 8-elements unilateral comb antenna are expertly designed to reduce the side lobe level by asymmetrically distributing the rectangular slits, balancing the current distribution, and making the antenna radiation pattern symmetrical. Compared with the traditional comb-shaped antennas, the sidelobe decreases by 3.29dB and 6.24dB respectively. And the 3dBbeamwidth in azimuth is 99.81°, 58.74°, and 3dBbeamwidth in elevation is 11.1°, 13.7° for proposed unilateral antenna and bilateral antenna, respectively. The asymmetrically distributed radiation elements minimize antenna sidelobe, balance the radiation pattern and improve signal detection accuracy for radar antennas.

关键词： Microwave antennas Microwave technology Microwave integrated circuits Radar detection Interference Millimeter wave radar Radar antennas

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Polarity-responsive fluorescence lifetime probe for in vivo imaging of Aβ plaque dynamics: Unveiling PBM-induced Aβ polarity reversal

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Matter 2025年第5期8卷

作者： Huang, Zhenlong Wang, Yiqiang Lin, Fangrui Luo, Ziyi Xu, Hao Alifu, Nuernisha Li, Jia Weng, Xiaoyu Song, Jun Liu, Liwei Chen, Yu Qu, Junle and Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province Shenzhen University Shenzhen518060 China School of Medical Engineering and Technology Xinjiang Medical University Urumqi830054 China

Photobiomodulation (PBM) has gained significant attention as a potential therapy for Alzheimer disease (AD) due to its role in promoting amyloid-β (Aβ) plaque clearance. However, its effects on the physicochemical properties of Aβ plaques before clearance remain poorly understood. Here, we introduce SiR-Aβ, a novel polarity-sensitive fluorescence lifetime probe with high blood-brain barrier permeability and selective Aβ plaque binding, enabling dynamic in vivo monitoring of plaque polarity. SiR-Aβ exhibits high sensitivity to environmental polarity, with its fluorescence lifetime increasing as polarity decreases. Fluorescence lifetime imaging (FLIM) revealed a gradual lifetime increase during plaque development, indicating reduced polarity. Notably, 40 Hz visible light stimulation induced a PBM-driven reversal of Aβ plaque polarity, independent of plaque size and preceding plaque clearance. These findings provide new insights into PBM's mechanism in targeting Aβ plaques and suggest polarity changes as a potential early marker for assessing PBM treatment efficacy. © 2025 The Author(s)

关键词： Fluorescence imaging

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Effects of electrical stress on the characteristics and defect behaviors in GaN-based near-ultraviolet light emitting diodes

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Chinese Physics B 2022年第6期31卷 678-682页

作者： Ying-Zhe Wang Mao-Sen Wang Ning Hua Kai Chen Zhi-Min He Xue-Feng Zheng Pei-Xian Li Xiao-Hua Ma Li-Xin Guo Yue Hao Key Laboratory of Wide Bandgap Semiconductor Materials and Devices School of MicroelectronicsXidian UniversityXi’an 710071China Shanghai Aerospace Electronic Technology Institute Shanghai 201109China School of Advanced Materials and Nanotechnology Xidian UniversityXi’an 710071China School of Physics and Optoelectronic Engineering Xidian UniversityXi’an 710071China

The degradation mechanism of GaN-based near-ultraviolet(NUV,320-400 nm)light emitting diodes(LEDs)with low-indium content under electrical stress is studied from the aspect of defects.A decrease in the optical power and an increase in the leakage current are observed after electrical *** defect behaviors are characterized using deep level transient spectroscopy(DLTS)measurement under different filling pulse *** stress,the concentration of defects with the energy level of 0.47-0.56 eV increases,accompanied by decrease in the concentration of 0.72-0.84 eV *** the defect energy level with the increased yellow luminescence in photoluminescence spectra,the device degradation can be attributed to the activation of the gallium vacancy and oxygen related complex defect along dislocation,which was previously passivated with *** study reveals the evolution process of defects under electrical stress and their spatial location,laying a foundation for manufacture of GaN-based NUV LEDs with high reliability.

关键词： light emitting diodes GaN electrical stress defect

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3D Printed Microlens Probe for Optical Coherence Tomography

3D Printed Microlens Probe for Optical Coherence Tomography

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2023 Asia Communications and Photonics Conference/2023 International Photonics and optoelectronics Meetings, ACP/POEM 2023

作者： Tai, Yalong Li, Zhuorong Liu, Dejun Li, Bozhe Zhu, Rui Li, Jianan Li, Qiang Liu, Haiping Liao, Changrui Wang, Yiping Shenzhen University Shenzhen Key Laboratory of Photonic Devices and Sensing Systems for Internet of Things Guangdong and Hong Kong Joint Research Centre for Optical Fibre Sensors State Key Laboratory of Radio Frequency Heterogeneous Integration Shenzhen China College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen Key Laboratory of Ultrafast Laser Micro/Nano Manufacturing Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education/Guangdong Province Shenzhen China International Graduate School at Shenzhen Tsinghua University Shenzhen China Shenzhen Vivolight Medical Device & Technology Co. Ltd. Shenzhen China Xi'An Institute of Optics and Precision Mechanics Chinese Academy of Sciences State Key Laboratory of Transient Optics and Photonics Xi'an China

ISBN: (纸本)9798350312614

Microsized endoscopy is increasingly demanded in medical clinical diagnosis for imaging in small blood vessels or delicate organs. In this paper, we propose a 3D printed side-viewing microlens on fiber tip by using the femtosecond laser two-photon polymerization (TPP) method for optical coherence tomography (OCT) imaging applications. The printed microlens is only 210 μm in width and 270 μm in height, its measured lateral resolution is around 9.4 μm in air. It is demonstrated that the proposed microlens can easily profile the depth resolved inner structure of a homemade plastic pipe. © 2023 IEEE.

关键词： 3D printing femtosecond laser microlens onfiber Optical coherence tomography two-photon polymerization

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Microscopic origin of magnetoferroelectricity in monolayer NiBr2 and NiI2

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Physical Review B 2025年第9期111卷 094440-094440页

作者： Hui-Shi Yu Xiao-Sheng Ni Dao-Xin Yao Kun Cao Center for Neutron Science and Technology Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices State Key Laboratory of Optoelectronic Materials and Technologies School of Physics Sun Yat-Sen University Guangzhou 510275 People's Republic of China Peng Cheng Laboratory Frontier Research Center Shenzhen People's Republic of China

We investigate the magnetoelectric properties of the monolayer NiX2 (X = Br, I) through first-principles calculations. Our calculations predict that the NiBr2 monolayer exhibits a cycloidal magnetic ground state. For the NiI2 monolayer, a proper-screw helical magnetic ground state with modulation vector Q=(q,0,0) is adopted and approximated based on experimental observations. The electric polarization in NiBr2 shows a linear dependence on the spin-orbit coupling strength λSOC, which can be adequately described by the generalized Katsura-Nagaosa-Balatsky (gKNB) model, considering contributions from up to the third-nearest-neighbor spin pairs. In contrast, the electric polarization in NiI2 exhibits a distinct dependence on q and λSOC, which cannot be fully explained by the gKNB mechanism alone. To account for this, we incorporate the higher-order p−d hybridization mechanism, demonstrating that the magnetoelectric behavior in NiI2 arises from the combined effects of the gKNB model and p−d hybridization. Furthermore, we quantitatively extract their respective contributions, providing a comprehensive understanding of magnetoelectric coupling in monolayer NiBr2 and NiI2, with implications readily applicable to their bulk counterparts.

关键词： Monolayers

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Spindle-Shaped Mos2/ Mnni Bimetallic Hydroxide Derived from Metal-Organic Frameworks as Electrode Materials for High Performance Supercapacitors

SSRN

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SSRN 2023年

作者： Qian, Jing Xu, Junhui Kong, Zhibo Zhang, Liang Wang, Yazhen Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education School of Optoelectronic Materials & Technology Jianghan University Wuhan430056 China School of Optoelectronic Materials & Technology Jianghan University Wuhan430056 China

Hydroxides produced from metal-organic frameworks (MOFs) offer a promising platform for high performance as supercapacitor electrode materials. By alkalinizing the precursor MoS2/MnNi-MOF-74, a novel MoS2/manganese-nickel double hydroxide (MoS2/MnNiDH) with a spindle shape has been successfully prepared. The composite material MoS2/MnNiDH exhibits a high specific capacitance of 2194.4 F/g at 1 A/g, and good capacity retention of 87.1% after 5000 charge/discharge cycles in a three-electrode system. Impressively, an asymmetric supercapacitor (MoS2/MnNiDH //AC, ASC) delivers a high energy density of 56.1 Wh/kg at the power density of 931.0 W/kg and more remarkable cycling stability retention of 95.0% after 10000 cycles in a two-electrode system. Finally, two assembled ASC connected in series can keep a blue LED blazing for more than 10 minutes, demonstrating that the MoS2/MnNiDH is a promising electrode material for high-performance supercapacitors. © 2023, The Authors. All rights reserved.

关键词： Electrodes

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Performance Study of Array Detector for Spatial Phase Compensation in Laser Heterodyne detection

SSRN

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SSRN 2024年

作者： Dong, Hongzhou Wei, Junjie Zhang, Sunhao Ao, Mingwu Yang, Xianming State Key Laboratory of Electronic Thin Films and integrated Devices School of Optoelectronic Information University of Electronic Science and Technology of China Chengdu610054 China

Based on an array detector and autocorrelation operation, a new compensation method has recently been proposed for overcoming the influence of spatial phase distortion. When severe phase distortion exists, the more elements in the array detector, the stronger the signal. But more processing circuits needed in this case cause more noises, thus resulting in a contradiction between strengthening signal and reducing noise. To probe this problem, a theoretical formula for the signal-to-noise ratio (SNR) of the array detector is derived based on a saturation effect model. The analysis from the formula indicates that, when local oscillator light (LO) power is optimal, the additional noises caused by more detector elements will not affect the maximum SNR of the array detector, which is confirmed by an experiment in this paper and has a guiding significance for the new method. By generating misaligned angle and simulating atmospheric turbulence, the performance of the method with different numbers of array elements are experimentally examined. The results verify that even few array elements in the array can effectively overcome the influence of different types of phase distortions. These works in this paper further promote the practicality of the new method. © 2024, The Authors. All rights reserved.

关键词： Heterodyne detection

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