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Polarization-and stress-related lattice dynamics in solid-solution perovskite ferroelectrics

材料科学技术（英文版） 2025年第8期211卷 244-253页

作者： Bohan Xing Yu Wang Chengpeng Hu Xiangda Meng Xiaolin Huang Xing Wen Xinyu Jin Jinyu Ruan Qingxin Meng Peng Tan Hao Tian School of Physics Harbin Institute of TechnologyHarbin 150001China School of Physics Harbin Institute of TechnologyHarbin 150001China Key Laboratory of Micro-Nano Optoelectronic Information System Ministry of Industry and Information TechnologyHarbin 150001China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

Perovskite ferroelectrics play an essential role in modern science and *** excellent proper-ties of perovskites are closely related to their lattice *** tantalate niobate(KTa1-xNbxO3,abbreviated as KTN)is a typical solid-solution perovskite with superior *** the opti-cal and electrical performances of KTN crystals have been widely explored,information on their lattice dynamics is still scarce,which partially limits the research and performance optimization of *** a solid-solution,spontaneous polarization of KTN exhibits strong tunability,and there is stress within ***,we performed first-principles calculations in conjunction with experiments to investigate the polarization-and stress-related lattice dynamics in *** assigned the vibration modes of observed Raman peaks,and established the relationship between spontaneous polarization and ***-cially,the lattice dynamics evolution of KTN crystal under stress was *** the results provide insights into the regulatory effect of stress on dielectric property from the perspective of lattice ***,the variation trends of phonons under stress,as well as the mechanism of stress effect in tetrag-onal perovskites were *** conclusions drawn for KTN crystal were generalized to tetragonal ferroelectric *** results help to reflect spontaneous polarization and structural characteristics distribution through non-destructive Raman spectra,and give a reference for improving performance by regulating lattice *** findings will hopefully guide research on performance origin and refined design of perovskite functional materials.

关键词： KTN crystal Lattice dynamics Spontaneous polarization Stress Perovskites

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Splitter engineering through optimizing topological adiababtic passage

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Frontiers of physics 2025年第1期20卷 145-163页

作者： Jia-Ning Zhang Jin-Lei Wu Cheng Lv Jiabao Yao Jie Song Yong-Yuan Jiang School of Physics Harbin Institute of TechnologyHarbin 150001China School of Physics Zhengzhou UniversityZhengzhou 450001China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China Key Laboratory of Micro-Nano Optoelectronic Information System Ministry of Industry and Information TechnologyHarbin 150001China Key Laboratory of Micro-Optics and Photonic Technology of Heilongjiang Province Harbin Institute of TechnologyHarbin 150001China

Topologically protected states are important in realizing robust optical behaviors that are quite insensitive to local defects or perturbations,which provide a promising solution for robust photonic ***,we propose to implement fast topological beam splitters and routers via the adiabatic passage of edge and interface states in the cross-linking configuration of Su-Schrieffer-Heeger(SSH)chains with interface *** channel state does not immerse into the band continuum during the adiabatic cycle,making the adiabatic restriction less stringent and the transport process more *** on the accelerated topological pumping,the beam splitters and routers exhibit improved robustness against losses of the system yet degraded resilience to fluctuation of coupling strengths and on-site energies compared with the conventional topological splitting and routing *** addition,we confirm that the model demonstrates good scalability when the system size is *** simulation results of topological beam splitting in coupled waveguide arrays are in good consistency with theoretical *** topological design provides a robust way to control photons,which may suggest further application of topological devices with unique properties and functionalities for integrated photonics.

关键词： topological effects in photonic systems Su-Schrieffer-Heeger topological photonics waveguides

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Automatic Segmentation of Diabetic Macular Edemas and ILM-RPE Layers in Retinal OCT Images Based on MFANet 23

Automatic Segmentation of Diabetic Macular Edemas and ILM-RP...

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9th International Conference on Computing and Artificial Intelligence, ICCAI 2023

作者： Liu, Shuang Wu, Jun Xiao, Zhitao Geng, Lei Zhang, Fang School of Electronics and Information Engineering Tianjin Key Laboratory of Optoelectronic Detection Technology and System TianGong University Tianjin300387 China School of Life Sciences Tianjin Key Laboratory of Optoelectronic Detection Technology and System TianGong University Tianjin300387 China

ISBN: (纸本)9781450399029

Aiming at the problems of blurred boundary and low segmentation accuracy of existing retinal OCT image segmentation methods, this paper designs a MFANet semantic segmentation model based on encode-decoder for the purpose of accurate segmentation of diabetic macular edemas and ILM-RPE layers, and proposes an automatic retinal OCT image segmentation method based on this model. This method takes the DeepLabV3+ network as the main body and improves the dilated convolution part, which can fully extract the multiscale features of the lesions and obtain a large enough receptive field to effectively balance the local and global information of the retina;the decoder increases the attention feature integration module, reduces information reduction and enlarges the global dimension interaction feature. The introduced global attention effectively strengthens the model’s learning of important features of retinal image. The experimental results show that the proposed method has better segmentation effect than the existing methods, and the MIoU reaches 85.82%. It can extract the macular edema regions quickly and accurately, identify the boundary information better, and provide a quantitative analysis tool for clinical diagnosis and treatment. © 2023 Copyright held by the owner/author(s).

关键词： Semantic Segmentation

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Investigation of Short-Circuit Failure Mechanism in 1.2kV SiC MOSFET 2

Investigation of Short-Circuit Failure Mechanism in 1.2kV Si...

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2nd IEEE International Power Electronics and Application Symposium, PEAS 2023

作者： Luo, Houcai Wu, Huan Zhang, Jingping Zheng, Bofeng Chen, Xianping Chongqing University Key Laboratory of Optoelectronic Technology and Systems Chongqing400044 China System Security and New Technology Chongqing University Key Laboratory of Optoelectronic Technology and Systems Education Ministry of China State Key Laboratory of Power Transmission Equipment Chongqing400044 China

ISBN: (纸本)9798350313765

The reliability and failure mechanism of SiC MOSFET under short-circuit was investigated using experiment and physical simulation in this paper. A short-circuit test platform was constructed, and a physical simulated model was calibrated. A commercial 1.2kV SiC MOSFET operated under different voltages including 200V, 400V, 600V with series short-circuit time was studied. The results showed that the thermal dissipation played a critical role during short-circuit operation, which is one of the most impacting factor to gate voltage and current tails. Two failed mechanisms including gate oxide degradation and parasitic BJT conduction failure were verified during short-circuit. This study may be helpful to the application engineering of SiC MOSFET. © 2023 IEEE.

关键词： experiment and physical simulation failure mechanism short-circuit SiC MOSFET

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Nonlocal Huygens'meta-lens for high-qualityfactor spin-multiplexing imaging

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Light(Science & Applications) 2025年第3期14卷 695-702页

作者： Jin Yao Yubin Fan Yunhui Gao Rong Lin Zhihui Wang Mu Ku Chen Shumin Xiao Din Ping Tsai Department of Electrical Engineering City University of Hong KongKowloonHong Kong SARChina Centre for Biosystems Neuroscienceand NanotechnologyCity University of Hong KongKowloonHong Kong SARChina State Key Laboratory of Terahertz and Milimeter Waves City University of Hong KongKowloonHong Kong SARChina State Key Laboratory on Tunable Laser Technology Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information SystemShenzhen Graduate SchoolHarbin Institute of TechnologyShenzhen 518055China Pengcheng Laboratory ShenzhenChina

Combining bright-feld and edge-enhanced imaging affords an effective avenue for extracting complex morphological information from objects,which is particularly beneficial for biological *** metalenses present promising candidates for achieving this ***,current multiplexing meta-lenses lack spectral modulation,and crosstalk between different wavelengths hampers the imaging quality,especilly for biological samples requiring precise wavelength ***,we experimentally demonstrate the nonlocal Huygens'meta-lens for high-quality-factor spin-multiplexing ***-bound states in the continuum(q-BlCs)are excited to provide a high quality factor of 90 and incident-angle *** generalized Kerker condition,driven by Fano-like interactions between q-BIC and in-plane Mie resonances,breaks the radiation symmetry,resulting in a transmission peak with a geometric phase for polarization-converted light,while unconverted light exhibits a transmission dip without a geometric *** polarization conversion efficiency of 65%is achieved,accompanied by a minimal unconverted value,surpassing the theoretical limit of traditional thin nonlocal *** these effects,the output polarization-converted state exhibits an efficient wavelengthselective focusing phase *** unconverted counterpart serves as an effective spatial frequency filter based on incident-angular dispersion,passing high-frequency edge ***-field imaging and edge detection are thus presented under two output spin *** work provides a versatile framework for nonlocal metasurfaces,boosting biomedical imaging and sensing applications.

关键词： nonlocal Huygensmeta lens biological imagingmultiplexing metalenses bright field imaging edge enhanced imaging high quality factor spin multiplexing imaging extracting complex morphological information biological samples spectral modulationand

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Highly sensitive,humidity-tolerant and flexible NO_(2)sensors based on nanoplate Bi_(2)Se_(3)film

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Chinese Chemical Letters 2023年第8期34卷 408-411页

作者： Yanjie Wang Cheng Tang Min Su Yixiong Ji Lei Xie Qi Yang Aijun Du Yong Zhou Jun Yang Key Laboratory of Optoelectronic Technology and System of Ministry of Education College of Optoelectronic EngineeringChongqing UniversityChongqing 400044China School of Chemistry and Physics Centre of Materials ScienceQueensland University of TechnologyBrisbane 4001Australia Chongqing Institute of Green and Intelligent Technology Chinese Academy of SciencesChongqing 400714China

Recently,two-dimension(2D)materials have fueled considerable interest in the field of gas sensing to cope urgent demands at specific ***,the susceptibility to ambient humidity,and/or fragile operation stability always frustrate their further *** overcome these drawbacks,we proposed one novel flexible gas sensor based on bismuth selenide(Bi_(2)Se_(3))nanoplates for sensitive NO_(2)detection at room *** as-prepared Bi_(2)Se_(3)sensor exhibited favorable sensing performance,including remarkable NO_(2)selectivity,high response of 120%and fast response time of 81 s toward 5ppm NO_(2),an ultralow detection limit of 100 ppb,and nice ***,the excellent humidity tolerance and mechanical flexibility endowed Bi_(2)Se_(3)sensors with admirable reliability under harsh working *** first-principles calculation further revealed the insights of extraordinary NO_(2)selectivity and the underlying gas-sensing mechanism.

关键词： Flexible NO_(2)sensor Bi_(2)Se_(3)nanoplates Humidity tolerance Room-temperature operation First-principles calculation

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Three-axis high-sensitivity vibration sensor based on ultra-fine and ultra-short fiber Bragg gratings

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IEEE Sensors Journal 2025年第12期25卷 21557-21565页

作者： Yu, Chenbo Xin, Jingtao Liao, JingJing Li, Qihui Li, Kun Beijing Information Science & Technology University Key Laboratory of the Ministry of Education for Optoelectronic Measurement Technology and Instrument Beijing100192 China Guangzhou Nansha Intelligent Photonic Sensing Research Institute Guangzhou511462 China Beijing Information Science & Technology University Beijing Laboratory of Optical Fiber Sensing and System Beijing100016 China

This paper presents a three-axis high-sensitivity vibration sensor based on ultra-fine and ultra-short fiber Bragg gratings (FBGs). A theoretical model for the sensor's sensitivity and natural frequency is developed by deriving equations for steady-state torque balance. The effects of spring plate thickness, fiber diameter, and FBG packaging length on sensor performance are analyzed by this model. Results show that spring plate thickness has almost no impact, reducing fiber diameter improves sensitivity, and shortening FBG packaging length increases natural frequency. Therefore, based on the ultra-fine and ultra-short fiber Bragg gratings, the sensor is 3D modeled and fabricated. The performance of the sensor is verified through finite element analysis and experiments. The experimental results show that the natural frequencies of the sensor in X, Y, and Z directions are 466 Hz, 477 Hz, and 445 Hz, respectively, with a working frequency band of 0-300 Hz, and sensitivities of 2258.4, 2240.8, and 2274.2 pm/g, respectively. The linearity in the three-axis directions reaches R² = 0.9998, and the minimum acceleration resolution is about 95 μg. The sensor's performance, characterized by high sensitivity, wide bandwidth, and excellent three-axis consistency, offering valuable insights for high-sensitivity sensor designs. © 2025 IEEE.

关键词： Fiber Bragg gratings

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Spectral Demodulation system Based on Two Transmission Volume Bragg Gratings

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Photonic Sensors 2021年第3期11卷 334-340页

作者： Guanghui Sui Zhiqi Wang Ning Wang Peijian Huang Yong Zhu Jie Zhang School of Optics and Photonics Beijing Institute of TechnologyBeijing100081China Changcheng Institute of Metrology and Measurement Beijing100095China The key Laboratory of Optoelectronic Technology&System(Ministry of Education) Chongqing UniversityChongqing400044China

In this paper,a fiber grating demodulation system based on two transmission volume Bragg gratings(VBGs)was *** order to resolve the problem that the spectral resolution of the present fiber grating demodulation system is not high enough,the two transmission VBGs were applied to improve the spectral resolution and reduce the volume of the *** diffraction characteristics of the transmission VBGs were analyzed,and the optical path of the two transmission VBGs demodulation system was designed based on the diffraction *** grating constant,lens parameters,and aberration correction of the system were analyzed and *** calculation showed that the theoretical wavelength range of the demodulation system was from 1525 nm to 1565 nm and the theoretical optical resolution was 60 pm when the grating constant was 0.9168,the angle between two transmission VBGs was 89°,the focal length of the collimator was 60 mm,and the focal length of the imaging lens was 131.5 *** aberration of the system was well corrected by using a lens as the collimator and a reflector as the imaging *** system principle prototype was assembled and calibrated,and its performances were experimentally *** results showed that the spectrometer worked stably,with a wavelength range from 1525 nm to 1565 nm,an optical wavelength resolution of 65.3 pm,and a high demodulation speed of 10 kHz.

关键词： Spectrometer diffraction transmission volume Bragg grating fiber grating

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Research on an automatic light field refocusing method for a camera array

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Optics Express 2025年第10期33卷 20964-20980页

作者： Pan, Yihua Zhao, Yushan Li, Yuyang Liu, Bin Chen, Ping Shanxi Key Laboratory of Intelligent Detection Technology & Equipment School of Information and Communication Engineering North University of China Shanxi Taiyuan030051 China Key Laboratory of Photoelectronic Imaging Technology System of Ministry of Education of China School of Optics and Photonics Beijing Institute of Technology Beijing100081 China State Key Laboratory of Extreme Environment Optoelectronic Dynamic Testing Technology and Instruments North University of China Shanxi Taiyuan030051 China

Light field information includes the position and angle information of light in space. A camera array is one of the methods for obtaining light field information, which combines and arranges multiple cameras in space to achieve multi-angle imaging of the same target. Based on the light field information, a computational imaging method can be used to achieve refocusing technology for a camera array (also known as optical synthetic aperture imaging technology). In this technology, by setting the focusing coefficient, the light field information can be focused on different depths. This mode is called taking photos first and focusing later. However, in order to focus on a specific object surface, traditional refocusing methods require users to manually adjust the focusing coefficient multiple times, which is time-consuming and user-unfriendly. Therefore, in this paper, we propose an automatic focusing method based on the optimal focusing coefficient map (OFCM) to address the manual refocusing problem. This method transforms the refocusing problem into obtaining the optimal focus coefficient map. In the process of solving OFCM, the threshold filtering method and the neighborhood filling method are used to optimize the results and improve the robustness of the proposed method. The experimental results show that our proposed method has higher imaging quality and faster running efficiency compared to automatic refocusing methods based on disparity maps and gradient functions. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Computational Imaging

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Spatial-Frequency Information Interaction Diffusion for SAR Colorization

Spatial-Frequency Information Interaction Diffusion for SAR ...

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2025 IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2025

作者： Zhang, Xupei Qin, Hanlin Li, Jingjing Geng, Jinni Gao, Zihan Yu, Yue School of Optoelectronic Engineering Xidian University Xi'an710071 China Xi'an Key Laboratory of Infrared Technology and System Xi'an710071 China

ISBN: (纸本)9798350368741

The inherent speckle noise and grayscale characteristics of synthetic aperture radar (SAR) images pose challenges to information perception and interpretation. To address this issue, we propose a novel conditional diffusion model with spatial-frequency information interaction for SAR colorization, namely SFI4SC. Specifically, we introduce a learnable wavelet transform module to obtain the global frequency information of the input SAR image and then take it as a guiding condition to assist the diffusion model for SAR colorization. Additionally, we improved the network structure for the diffusion model by designing and introducing a spatial and frequency information interaction module to achieve multidimensional information interaction for the network inputs, further enhancing perceptual details and geometric structures of the SAR colorization results. Experimental results in the real-world remote sensing dataset show that our approach can successfully enhance visual clarity and informational content while preserving the unique characteristics of the SAR images. The code will be made publicly available. © 2025 IEEE.

关键词： Diffusion Model Image colorization Spatial-Frequency Interaction Synthetic aperture radar

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