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Effect of growth interruption time on the quality of InAs/GaSb type-Ⅱ superlattice grown by molecular beam epitaxy

Optoelectronics Letters 2023年第3期19卷 155-158页

作者： LIU Zhaojun ZHU Lianqing ZHENG Xiantong LU Lidan ZHANG Dongliang LIU Yuan School of Opto-Electronic Engineering Changchun University of Science and TechnologyChangchun 130022China Key Laboratory of the Ministry of Education for Optoelectronic Measurement Technology and Instrument Beijing Information Science&Technology UniversityBeijing 100192China

We systematically investigate the influence of growth interruption time on the properties of In As/Ga Sb type-II superlattices(T2SLs) epitaxial materials grown by molecular beam epitaxy(MBE). X-ray diffraction(XRD) and atomic force microscope(AFM) are used to characterize the material quality and morphology. The full width at half maximum(FWHM) of the XRD 0th satellite peaks ranges from 32″ to 41″, and the root mean square(RMS) roughness on a 5 μm×5 μm scan area is 0.2 nm. Photoluminescence(PL) test is used to reveal the influence of the growth interruption time on the optical property. Grazing incidence X-ray reflectivity(GIXRR) measurements are performed to analyze the roughness of the interface. The interface roughness(0.24 nm) is optimal when the interruption time is 0.5 s. The crystal quality of T2SLs can be optimized with appropriate interruption time by MBE, which is a guide for the material epitaxy of high performance T2SL infrared detector.

关键词： roughness interrupt beam

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Interface effect on superlattice quality and optical properties of InAs/GaSb type-Ⅱ superlattices grown by molecular beam epitaxy

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Chinese Physics B 2022年第12期31卷 671-676页

作者： Zhaojun Liu Lian-Qing Zhu Xian-Tong Zheng Yuan Liu Li-Dan Lu Dong-Liang Zhang The School of Opto-Electronic Engineering Changchun University of Science and TechnologyChangchun 130022China Key Laboratory of the Ministry of Education for Optoelectronic Measurement Technology and Instrument Beijing Information Science&Technology UniversityBeijing 100192China

We systematically investigate the influence of InSb interface(IF)engineering on the crystal quality and optical properties of strain-balanced InAs/GaSb type-Ⅱsuperlattices(T2SLs).The type-Ⅱsuperlattice structure is 120 periods InAs(8 ML)/GaSb(6 ML)with different thicknesses of InSb interface grown by molecular beam epitaxy(MBE).The highresolution x-ray diffraction(XRD)curves display sharp satellite peaks,and the narrow full width at half maximum(FWHM)of the 0th is only 30-39 *** high-resolution cross-sectional transmission electron microscopy(HRTEM)characterization,the InSb heterointerfaces and the clear spatial separation between the InAs and GaSb layers can be more intuitively *** the InSb interface thickness increases,the compressive strain increases,and the surface“bright spots”appear to be more apparent from the atomic force microscopy(AFM)***,photoluminescence(PL)measurements verify that,with the increase in the strain,the bandgap of the superlattice *** optimizing the InSb interface,a high-quality crystal with a well-defined surface and interface is obtained with a PL wavelength of 4.78μm,which can be used for mid-wave infrared(MWIR)detection.

关键词： InAs/GaSb type-Ⅱsuperlattice molecular beam epitaxy interface mid-wave infrared

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Analysis of Imaging Characteristics of Wide-field Lobster Eye Lens 3

Analysis of Imaging Characteristics of Wide-field Lobster Ey...

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3rd International Conference on Advanced Optics and Photonics Research in Engineering, AOPR 2023

作者： Ma, Shizhang Ouyang, Mingzhao Fu, Yuegang Hu, Yuan Zhang, Yuhui Yang, Yuxiang Wang, Shengyu Key Laboratory of Opto-electronic Measurement and Optical Information Transmission Technology Changchun University of Science and Technology Changchun130022 China

The lobster-eye lens is a reflected type focusing optics. It can be used for backscattering imaging that is a single-sided access technology for homeland security, detection of improvised explosive devices, non-destructive testing, and medical imaging. The aim of this study was to investigate the imaging characteristic of meridional lobster-eye lens with a planar imaging surface. The larger the field of view, the greater the spherical aberration, and the larger the field curvature of the edge field of view. Both spherical aberration and field curvature increase the size of the focal spot, and the images become blurry. Rays with a large angle of grazing incidence have large spherical aberration and curvature. The reflectivity of these rays drops sharply as the energy of photons increases. Therefore, spherical aberration and field curvature have a greater effect on photons with low energy. These conclusions can help improve the design of a lobster-eye lens for wide-field imaging applications. © Published under licence by IOP Publishing Ltd.

关键词： Spheres

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Deterministic and complete hyperentangled Bell states analysis assisted by frequency and time interval degrees of freedom

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Frontiers of physics 2022年第5期17卷 149-157页

作者： Xin-Jie Zhou Wen-Qiang Liu Hai-Rui Wei Yan-Bei Zheng Fang-Fang Du School of Mathematics and Physics University of Science and Technology BeijingBeijing 100083China Center for Quantum Technology Research and Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurements(MOE) School of PhysicsBeijing Institute of TechnologyBeijing 100081China Science and Technology on Electronic Test and Measurement Laboratory North University of ChinaTaiyuan 030051China

Hyperentangled Bell states analysis(HBSA)is an essential building block for certain hyper-parallel quantum information *** propose a complete and deterministic HBSA scheme encoded in spatial and polarization degrees of freedom(DOFs)of two-photon system assisted by a fixed frequency-based entanglement and a time interval *** parity information the spatial-based and polarization-based hyper-entanglement can be distinguished by the distinct time intervals of the photon pairs,and the phase information can be distinguished by the detection *** with previous schemes,the number of the auxiliary entanglements is reduced from two to one by introducing time interval ***,the additional frequency and time interval DOFs suffer less from the collective channel noise.

关键词： hyperentangled Bell states analysis multiple degrees of freedom time interval

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Four ribbons of double-layer graphene suspending masses for NEMS applications

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Microsystems & Nanoengineering 2024年第5期10卷 277-286页

作者： Xuge Fan Chang He Jie Ding Sayedeh Shirin Afyouni Akbari Wendong Zhang Advanced Research Institute of Multidisciplinary Sciences Bejing Institute of Technology100081 BeijingChina School of Integrated Circuits and Electronics Bejing Institute of Technology100081 BeijingChina Center for Interdisciplinary Science of Optical Quantum and NEMS Integration Beijing 100081China Advanced NEMS Group Ecole Polytechnique Federale de Lausanne(EPFL)1015 LausanneSwitzerland State Key Laboratory of Dynamic Measurement Technology North University of ChinaTaiyuan 030051China National Key Laboratory for Electronic Measurement Technology School of Instrument and ElectronicsNorth University of ChinaTaiyuan 030051China

Graphene ribbons with a suspended proof mass for nanomechanical systems have been rarely ***,we report three types of nanomechanical devices consisting of graphene ribbons(two ribbons,four ribbons-cross and four ribbons-parallel)with suspended Si proof masses and studied their mechanical *** resonance frequencies and built-in stresses of three types of devices ranged from tens of kHz to hundreds of kHz,and from 82.61 MPa to 545.73 MPa,respectively,both of which decrease with the increase of the size of proof *** devices with four graphene ribbons featured higher resonance frequencies and spring constants,but lower built-in stresses than two ribbon devices under otherwise identical *** Young's modulus and fracture strain of double-layer graphene were measured to be 0.34 TPa and 1.13%respectively,by using the experimental data and finite element analysis(FEA)*** studies would lay the foundation for understanding of mechanical properties of graphene ribbons with a suspended proof mass and their potential applications in nanoelectromechanical systems.

关键词： proof layer double

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Mid-wavelength InAs/GaSb type-Ⅱ superlattice barrier detector with nBn design and M barrier

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Optoelectronics Letters 2023年第10期19卷 577-582页

作者： LIU Zhaojun ZHU Lianqing LU Lidan DONG Mingli ZHANG Dongliang ZHENG Xiantong School of Opto-Electronic Engineering Changchun University of Science&TechnologyChangchun130022China Key Laboratory of the Ministry of Education for Optoelectronic Measurement Technology and Instrument Beijing Information Science&Technology UniversityBeijing100192China Key Laboratory of Optical Fiber Sensing and System Beijing Information Science&Technology UniversityBeijing100016China

This study reports the performance of an InAs/GaSb type-Ⅱ superlattices(T2SLs) detector with nBn structure for mid-wavelength infrared(MWIR) detection. An electronic band structure of M barrier is calculated using 8-band k·p method, and the nBn structure is designed with the M barrier. The detector is prepared by wet etching, which is simple in manufacturing process. X-ray diffraction(XRD) and atomic force microscope(AFM) characteristics indicate that the detector material has good crystal quality and surface morphology. The saturation bias of the spectral response measurements at 77 K is 300 m V, and the device is promising to work at a temperature of 140 K. Energy gap of T2SLs versus temperature is fitted by the Varshni curve, and zero temperature bandgap Eg(0), empirical coefficients α and β are extracted. A dark current density of 3.2×10-5A/cm2and differential resistance area(RA) product of 1.0×104Ω·cm2are measured at 77 K. The dominant mechanism of dark current at different temperature ranges is analyzed. The device with a 50% cutoff wavelength of 4.68 μm exhibits a responsivity of 0.6 A/W, a topside illuminated quantum efficiency of 20% without antireflection coating(ARC), and a detectivity of 9.17×1011cm·Hz1/2/W at 77 K and 0.3 V.

关键词： InAs/GaSb barrier structure

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The electronic and optical properties in InAs and GaSb bulk materials: A First-Principles Approach 11

The electronic and optical properties in InAs and GaSb bulk ...

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11th International Symposium on Precision Mechanical measurements

作者： Gong, Ruixin Zhu, Lianqing Liu, Zhiying School of Opto-Electronic Engineering Changchun University of Science and Technology China Key Laboratory of the Ministry of Education for Optoelectronic Measurement Technology and Instrument Beijing Information Science and Technology University Beijing100015 China

ISBN: (纸本)9781510680296

In this work, we investigated the electronic and optical properties of traditional semiconductor materials, InAs and GaSb. By constructing crystal structures for InAs and GaSb, we performed calculations using the first-principles Density Functional Theory (DFT) with the HSE+SOC method. In contrast to the results obtained using the traditional PBE algorithm, which yielded a negative or zero bandgap for InAs, our calculations provided theoretical support and accurately determined the bandgap values of 0.3658 eV for InAs and 0.772 eV for GaSb. These results align well with the experimentally reported bandgap values for the bulk materials. Furthermore, by strictly adhering to the validity conditions of DFT, we obtained accurate optical properties that are consistent with experimental results. Based on the optical characteristics of InAs and GaSb semiconductor materials, it was demonstrated that have a high performance for absorbing light. These findings provide a possibility for using DFT calculations in the development of second-generation InAs/GaSb superlattice infrared detectors. © 2024 SPIE.

关键词： Infrared detectors

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High‑permittivity ceramics enabled highly homogeneous zero‑index metamaterials for high‑directivity antennas and beyond

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eLight 2024年第1期4卷 262-271页

作者： Yueyang Liu Tian Dong Xu Qin Weijia Luo Ning Leng Yujing He Yong Yuan Ming Bai Jingbo Sun Ji Zhou Yue Li Yang Li State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision InstrumentTsinghua UniversityBeijing 100084China Department of Electronic Engineering Tsinghua UniversityBeijing 100084China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China The School of Electronic and Information Engineering Beihang UniversityBeijing 100191China

Zero-index metamaterials(ZIMs)can support uniform electromagnetic field distributions at any frequency,but their applications are hampered by the ZIM’s homogenization level—only 3 unit cells per free-space wavelength,which is fundamentally limited by the low-permittivity inclusions(εr≈12)and background matrix(εr≈1).Here,by filling high-permittivity SrTiO3 ceramic(εr≈294)pillars in BaTiO3(εr≈25)background matrix,we demonstrate a highly homogeneous microwave ZIM with an over threefold increase in the homogenization *** such a ZIM,we achieve not only an antenna,approaching the fundamental limit in the directivity with outstanding scalability,but also a concave lens with a focal length of as short as 1λ*** highly homogeneous ZIM has profound implications in ceramics,ZIM-based waveguides and cavities,free-space wavefront manipulation,and microwave quantum optics,and opens up enormous possibilities in wireless communications,remote sensing,global positioning satellites,etc.

关键词： Zero-refractive index Metamaterials Antenna

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Human movement monitoring and behavior recognition for intelligent sports using customizable and flexible triboelectric nanogenerator

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science China(Technological sciences) 2022年第4期65卷 826-836页

作者： YANG Yun HOU XiaoJuan GENG WenPing MU JiLiang ZHANG Le WANG XiangDong HE Jian XIONG Ji Jun CHOU XiuJian Science and Technology on Electronic Test and Measurement Laboratory North University of ChinaTaiyuan 030051China Department of Mining Engineering Luliang UniversityLvliang 033000China Physical Education Institute Jimei UniversityXiamen 361021China

Effective collection,recognition,and analysis of sports information is the key to intelligent sports,which can help athletes to improve their skills and formulate scientific training plans and competition *** present,wearable electronic devices used for movement monitoring still have some limitations,such as high cost and energy consumption,incompatibility of suitable flexibility and personalized spatial structure,dissatisfactory data analysis methods,*** this work,a novel three-dimensionalprinted thermoplastic polyurethane is introduced as the elastic shell and friction layer,and it endows the proposed customizable and flexible triboelectric nanogenerator(CF-TENG)with personalized spatial structure and robust correlation to external *** practical application,it exhibits highly sensitive responses to the joint-bending motion of the finger,wrist,or ***,a pressure-sensing insole and smart ski pole based on CF-TENG are manufactured to build a comprehensive sports monitoring system to transmit the athletes’motion information from feet and hands through the plantar pressure distribution and ski pole *** recognize the movement status,the self-developed automatic peak recognition algorithm(P-Find)and machine learning algorithm(subspace K-Nearest Neighbors)were introduced to accurately distinguish the four typical motion behaviors and three primary sub-techniques of cross-country skiing,with accuracy rates of 98.2%and 100%.This work provides a novel strategy to promote the personalized applications of TENGs in intelligent sports.

关键词： triboelectric nanogenerator flexible movement monitoring behavior recognition intelligent sports

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Flexible Wearable Triboelectric Pressure Sensor Based on Symmetrical Layered Structure for Motion Perception and Silent Communication

SSRN

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SSRN 2024年

作者： Mu, Jiliang Zou, Jie Wang, Yin Lei, Yuntao He, Jian Hou, Xiaojuan Zhang, Le Yu, Junbin Chou, Xiujian North University of China China Science and Technology on Electronic Test and Measurement Laboratory

In the emerging field of flexible wearable devices, the demand for high-performance flexible triboelectric pressure sensors is increasing continuously. However, it is currently impossible to break through the dilemma of combining high sensitivity with a wide pressure detection range. To overcome this limitation, this paper proposes a flexible wearable triboelectric pressure sensor (FWTPS) based on a symmetrical layered structure, which can be applied in the fields of motion sensing and information transmission. In terms of structure, triboelectric nanogenerator (TENG) based on a symmetrical layered structure is used as the sensing layer, which enhances the electrical output while circumventing the parasitic capacitance effect. In terms of materials, the effect on the electrical properties of PDMS matrix under the synergistic effect of SiO2 and SiC was investigated. In terms of microstructure, the prepared multi-scale hierarchical microstructures have abundant microforms that can be varied hierarchically, which improves the sensing capability of the sensing layer in the pressurized state of the device. With the synergistic effect of the above-mentioned, the FWTPS exhibits a wide pressure response range (1-1000 kPa), high sensitivity (8.16 V/104 Pa), fast response time (23 ms), and excellent stability (10,000 cycles). In addition, with respect to motion perception, FWTPS can be wearing on various parts of the human body for motion state sensing. With the function of the LSTM algorithm, the FWTPS silent signal was correctly parsed up to 90.86% success rate. This work has significant research value and practical significance for the future development of flexible wearable devices and human-computer interaction. © 2024, The Authors. All rights reserved.

关键词： Triboelectricity

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