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19th Conference on current developments in Lens design and optical engineering

作者： Lau, Chi-Chung Sun, Ching-Chern Yang, Tsung-Hsun Yu, Yeh-Wei Chou, Si-Min Ind Technol Res Inst Green Energy & Environm Res Labs Bldg 24195Sec 4Chung Hsin Rd Hsinchu 31057 Taiwan Natl Cent Univ Dept Opt & Photon Kwoh Ting Opt & Photon Bldg300 Jhongda Rd Taoyuan 32001 Taiwan

ISBN: (数字)9781510620629

ISBN: (纸本)9781510620629

This paper presents a new pattern design for encoding structured light for scanning 3D surface and the decoding process. The basic unit of the pattern is a code-block that contains one central label and eight square-shaped primitives that provide two functions: code-block indexing and point-positions for triangulating. The square-shaped primitive has one notch in a different position to represent 8 digit numbers, which are easily to convert label to number for indexing code-block. One primitive also contributes five point-positions, centroid and four extreme, for triangulating and estimating 3D information. The design of code-block has eight 8-bit numbers allowing a higher error-tolerant and providing better resolution in 3D reconstruction. Experiment shows that the proposed pattern is suitable for indoor mapping and large scene scanning.

关键词： coded structured light primitives 3-D data acquisition computer vision

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Performance Evaluation of WPT Circuit suitable for Wireless Charging

Performance Evaluation of WPT Circuit suitable for Wireless ...

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IEEE Symposium on Industrial Electronics & Applications (ISIEA)

作者： M. A.H. Zable Z I. Khan N. A. Zakaria N.E. Abd Rashid K. K. M. Shariff S. A. Enche Ab Rahim Faculty of Electrical Engineering Universiti Teknologi Mara Shah Alam Selangor Malaysia Microwave Research Institute Universiti Teknologi MARA Shah Alam Selangor Malaysia

ISBN: (数字)9781728166148

ISBN: (纸本)9781728166155

The usage of wireless power transfer is not new nowadays particularly for the smartphone. Modern wireless power transfer technology already has a rich history of research and growth, as well as excellent marketing developments. One of the main goals of this study is to study and analyze the major challenges that affect the overall performance of the wireless charging system specifically improving further charging distance as compared to the current wireless mobile charger. By using the coil-size disparity method, the wireless charger is studied to operate over a longer distance. This work uses an impedance-based quality factor tuning technique to design the WPT system with coil size disparity. By varying the coupling coefficient and the inductor turn ratio, adjustments were made to the circuit to increase the transfer efficiency and to increase the distance of the device from the charging pad. The finding shows that the circuit could deliver a 3v dc voltage when the coupling coefficient is set to 0.1.

关键词： Couplings Receivers Transmitters Inductive charging Wireless communication Magnetic resonance Tuning

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Band structure engineered tunneling heterostructures for high-performance visible and near-infrared photodetection

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Science China Materials 2020年第8期63卷 1537-1547页

作者： Fakun Wang Peng Luo Yue Zhang Yu Huang Qingfu Zhang Yuan Li Tianyou Zhai State Key Laboratory of Material Processing and Die&Mould Technology School of Material Sciences and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Tunneling heterostructures are emerging as a versatile architecture for photodetection due to their advanced optical sensitivity,tailorable detection band,and wellbalanced photoelectric ***,the existing tunneling heterostructures are mainly operated in the visible wavelengths and have been rarely investigated for the nearinfrared ***,we report the design and realization of a novel broken-gap tunneling heterostructure by combining WSe2 and Bi2Se3,which is able to realize the simultaneous visible and near-infrared detection because of the complementary bandgaps of WSe2 and Bi2Se3(1.46 and 0.3 e v respectively).Thanks to the realigned band structure,the heterostructure shows an ultralow dark current below picoampere and a high tunneling-dominated *** photodetector based on our tunneling heterostructure exhibits a superior specific detectivity of 7.9×1012Jones for a visible incident of 532 nm and 2.2×1010Jones for a 1456 nm nearinfrared *** study demonstrates a new band structure engineering avenue for the construction of van der Waals tunneling heterostructures for high-performance wide band photodetection.

关键词： band structure engineering van der Waals tunneling heterostructures Bi2Se3/WSe2 photodetector visible and near-infrared detection

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Reflection-mode virtual histology using photoacoustic remote sensing microscopy

arXiv

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arXiv 2020年

作者： Bell, Kevan Abbasi, Saad Dinakaran, Deepak Taher, Muba Bigras, Gilbert van Landeghem, Frank K.H. Mackey, John R. Reza, Parsin Haji PhotoMedicine Labs Department of Systems Design Engineering University of Waterloo WaterlooONN2L 3G1 Canada illumiSonics Inc. Department of Systems Design Engineering University of Waterloo WaterlooONN2L 3G1 Canada Department of Oncology University of Alberta EdmontonABT6G 1Z2 Canada Division of Dermatology Department of Medicine University of Alberta EdmontonABT6G 2V1 Canada Department of Laboratory Medicine and Pathology University of Alberta EdmontonABT6G 2V1 Canada E7-6416 200 University Avenue West WaterlooONN2L 3G1 Canada

Histological visualizations are critical to clinical disease management and are fundamental to biological understanding. However, current approaches that rely on bright-field microscopy require extensive tissue preparation prior to imaging. These processes are labor intensive and contribute to delays in clinical feedback that can extend to two to three weeks for standard paraffin-embedded tissue preparation and interpretation. Here, we present a label-free reflection-mode imaging modality that reveals cellular-scale morphology by detecting intrinsic endogenous contrast. We accomplish this with the novel photoacoustic remote sensing (PARS) detection system that permits non-contact optical absorption contrast to be extracted from thick and opaque biological targets with optical resolution. PARS was examined both as a rapid assessment tool that is capable of managing large samples (>1 cm2) in under 10 minutes, and as a high contrast imaging modality capable of extracting specific biological contrast to simulate conventional histological stains such as hematoxylin and eosin (H&E). The capabilities of the proposed method are demonstrated in a variety of human tissue preparations including formalin-fixed paraffin-embedded tissue blocks and unstained slides sectioned from these blocks, including normal and neoplastic human brain, and breast epithelium involved with breast cancer. Similarly, PARS images of human skin prepared by frozen section clearly demonstrated basal cell carcinoma and normal human skin tissue. Finally, we imaged unprocessed murine kidney and achieved histologically relevant subcellular morphology in fresh tissue. This represents a vital step towards an effective real-time clinical microscope that overcomes the limitations of standard histopathologic tissue preparations and enables real-time pathology assessment. Copyright © 2020, The Authors. All rights reserved.

关键词： Remote sensing

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Roadmap on Label-Free Super-Resolution Imaging

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LASER & PHOTONICS REvIEWS 2023年第12期17卷 2200029-2200029页

作者： Astratov, vasily N. Ben Sahel, Yair Eldar, Yonina C. Huang, Luzhe Ozcan, Aydogan Zheludev, Nikolay Zhao, Junxiang Burns, Zachary Liu, Zhaowei Narimanov, Evgenii Goswami, Neha Popescu, Gabriel Pfitzner, Emanuel Kukura, Philipp Hsiao, Yi-Teng Hsieh, Chia-Lung Abbey, Brian Diaspro, Alberto LeGratiet, Aymeric Bianchini, Paolo Shaked, Natan T. Simon, Bertrand verrier, Nicolas Debailleul, Matthieu Haeberle, Olivier Wang, Sheng Liu, Mengkun Bai, Yeran Cheng, Ji-Xin Kariman, Behjat S. Fujita, Katsumasa Sinvani, Moshe Zalevsky, Zeev Li, Xiangping Huang, Guan-Jie Chu, Shi-Wei Tzang, Omer Hershkovitz, Dror Cheshnovsky, Ori Huttunen, Mikko J. Stanciu, Stefan G. Smolyaninova, vera N. Smolyaninov, Igor I. Leonhardt, Ulf Sahebdivan, Sahar Wang, Zengbo Luk'yanchuk, Boris Wu, Limin Maslov, Alexey v. Jin, Boya Simovski, Constantin R. Perrin, Stephane Montgomery, Paul Lecler, Sylvain Univ North Carolina Dept Phys & Opt Sci Charlotte NC 28223 USA Weizmann Inst Sci Dept Comp Sci & Appl Math IL-7610001 Rehovot Israel Univ Calif Los Angeles Elect & Comp Engn Dept Los Angeles CA 90095 USA Univ Calif Los Angeles Bioengn Dept Los Angeles CA 90095 USA Univ Calif Los Angeles CNSI Los Angeles CA 90095 USA Univ Calif Los Angeles David Geffen Sch Med Los Angeles CA 90095 USA Univ Southampton Optoelect Res Ctr Southampton SO17 1BJ Hants England Nanyang Technol Univ Sch Phys & Math Sci Ctr Disrupt Photon Technol Photon Inst Singapore 637371 Singapore Univ Calif San Diego Dept Elect & Comp Engn 9500 Gilman Dr San Diego CA 92093 USA Univ Calif San Diego Mat Sci & Engn 9500 Gilman Dr San Diego CA 92093 USA Purdue Univ Sch Elect Engn W Lafayette IN 47907 USA Purdue Univ Birck Nanotechnol Ctr W Lafayette IN 47907 USA Univ Illinois Beckman Inst Adv Sci & Technol Quantitat Light Imaging Lab Champaign IL 61801 USA Univ Oxford Dept Chem Oxford OX1 3QZ England Acad Sinica 1 IAMS Roosevelt Rd Sect 4 Taipei 10617 Taiwan La Trobe Univ Australian Res Council Ctr Excellence Adv Mol Imaging Melbourne Vic 3086 Australia La Trobe Univ La Trobe Inst Mol Sci LIMS Dept Chem & Phys Melbourne Vic 3086 Australia Ist Italiano Tecnol CHT Opt Nanoscopy & NIC IIT Via Enrico Melen 83B I-16152 Genoa Italy Univ Genoa Dept Phys DIFILAB Via Dodecaneso 33 I-16146 Genoa Italy Univ Rennes CNRS Inst FOTON UMR 6082 F-22305 Lannion France Tel Aviv Univ Dept Biomed Engn Fac Engn IL-6997801 Tel Aviv Israel Univ Bordeaux Inst Opt Grad Sch CNRS UMR5298LP2N F-33405 Talence France Univ Haute Alsace IRIMAS UR UHA7499 F-68093 Mulhouse France Wuhan Univ Sch Phys & Technol Wuhan Hubei Peoples R China Wuhan Inst Quantum Technol Wuhan 430206 Peoples R China SUNY Stony Brook Dept Phys & Astron Stony Brook NY 11794 USA Brookhaven Natl Lab Natl Synchrotron Light Source 2 Upton NY 11973 USA Boston Univ Photon Ctr Boston MA 02215 USA Osaka Univ Inst Open &

Label-free super-resolution (LFSR) imaging relies on light-scattering processes in nanoscale objects without a need for fluorescent (FL) staining required in super-resolved FL microscopy. The objectives of this Roadmap are to present a comprehensive vision of the developments, the state-of-the-art in this field, and to discuss the resolution boundaries and hurdles that need to be overcome to break the classical diffraction limit of the label-free imaging. The scope of this Roadmap spans from the advanced interference detection techniques, where the diffraction-limited lateral resolution is combined with unsurpassed axial and temporal resolution, to techniques with true lateral super-resolution capability that are based on understanding resolution as an information science problem, on using novel structured illumination, near-field scanning, and nonlinear optics approaches, and on designing superlenses based on nanoplasmonics, metamaterials, transformation optics, and microsphere-assisted approaches. To this end, this Roadmap brings under the same umbrella researchers from the physics and biomedical optics communities in which such studies have often been developing separately. The ultimate intent of this paper is to create a vision for the current and future developments of LFSR imaging based on its physical mechanisms and to create a great opening for the series of articles in this field.

关键词： biomedical imaging diffraction limit label-free imaging near-field imaging optical microscopy super-resolution structured illumination

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design of On-Line Measurement System for Fine Particle Number Concentration of vehicle Exhaust Based on Diffusion Charge Theory 6th

Design of On-Line Measurement System for Fine Particle Numbe...

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6th International Conference on Frontier Computing, FC 2018

作者： Cong, Zhouyang Yu, Tongzhu Gui, Huaqiao Yang, Yixin Zhang, Jiaoshi Cheng, Yin Liu, Jianguo Key Laboratory of Environmental Optics and Technology Anhui Institute of Optics and Fine Mechanics the Chinese Academy of Sciences Hefei230031 China University of Science and Technology of China Hefei230026 China Anhui Provincial Key Laboratory of Environmental Optical Monitoring Technology Hefei230031 China

ISBN: (纸本)9789811336478

The concentration of particulate matter is an important parameter to measure exhaust emissions from motor vehicles. This article discusses the design of an on-line measurement system for fine particle number concentration. Based on charging models in continuum regime, a unipolar charger with free electron capture function was designed. After a high-sensitivity I–v conversion circuit was built in the micro current detection module, we designed a wide-range Faraday cup electrometer. The experimental results show that the charger can efficiently charge 23 nm–2.5 μm particles, achieve a stable discharge with an average discharge current of −5 μA (relative error is less than 1%). And a wide-range Faraday cup can achieve a ±500 pA range, fA—level electrical signal measurement. Compared with the AvL-APC 489 instrument, the integrated system experimental test is better than 87.2%, which can meet the on-line testing requirements for the concentration of motor vehicle exhaust particulates. © 2019, Springer Nature Singapore Pte Ltd.

关键词： Electrometers

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Green perovskite light-emitting diodes with simultaneous high luminance and quantum efficiency through charge injection engineering

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Science Bulletin 2020年第21期65卷 1832-1839,M0004页

作者： Tiankai Zhang Mingzhu Long Lingxiang Pan Kwanho Ngai Minchao Qin Fangyan Xie Xinhui Lu Jian Chen Jianbin Xu Department of Electronic Engineering The Chinese University of Hong KongHong Kong 999077China Department of Physics The Chinese University of Hong KongHong Kong 999077China State Key Laboratory of Optoelectronic Materials and Technologies(Sun Yat-sen University) Guangzhou 510275China

Metal halide perovskite light emitting diodes(PeLEDs)have recently experienced rapid development due to the tunable emission wavelengths,narrow emission linewidth and low material *** achieve stateof-the-art performance,the high photoluminescence quantum yield(PLQY)of the active emission layer,the balanced charge injection,and the optimized optical extraction should be considered *** chemical passivation strategies have been provided as controllable and efficient methods to improve the PLQY of the perovskite ***,high luminance under large injection current and high external quantum efficiency(EQE)can hardly be achieved due to Auger recombination at high carrier ***,we decreased the electron injection barrier by tuning the Fermi-level of the perovskite,leading to a reduced turn on *** molecular doping of the hole injection material,a more balanced hole injection was *** last,a device with modified charge injection realizes high luminance and quantum efficiency *** best device exhibits luminance of 55,000 cd m^-2 EQE of 8.02%at the working voltage of 2.65 v,current density of 115 mA cm^-2,and shows EQE T50 stability around 160 min at 100 mA cm^-2 injection current density.

关键词： Perovskite LED High luminance Structure design Balanced charge injection Molecular doping

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Ka-band MMIC LNA design

Ka-band MMIC LNA Design

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IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP)

作者： Gang Qin Liu Jing-Ping Li Zi-Ting Lin Hui-Jun School of Electronic and Optical Engineering Nanjing University of Science and Technology Nanjing China

ISBN: (数字)9781728160641

ISBN: (纸本)9781728160658

In order to better adapt to the requirements of smaller noise and better performance in low-noise amplifiers in radio communications,this article simulates and designs a 35GHz broadband monolithic microwave integrated circuit (MMIC) low noise amplifier,by adopting InGaAs pseudo-crystal high electron mobility transistor (pHEMT) process model. The circuit uses a three-stage cascaded dual power supply structure. The front-stage amplifier circuit optimizes the noise figure while ensuring a good input and output standing wave ratio. The last two stages provide maximum gain matching, which guarantees the good noise figure, gain flatness and vSWR of the overall *** addition, the source negative feedback inductance and bias network circuit of each stage are optimized to achieve a broadband output and high gain under low noise. The simulation design shows that under the working conditions of gate and drain bias voltages of -0.5v and 3v, and current of 90mA respectively, the amplifier has a minimum noise figure of less than 2dB and a maximum gain of more than 20dB in the 25-45GHz band. At 35GHz, it has a minimum noise figure of 1.702dB, a maximum gain of 24.594dB, an input standing wave ratio of 2.236 and an output standing wave ratio of *** designed low-noise amplifier can be implemented in a broadband millimeter wave transceiver system.

关键词： Noise figure Microstrip Low-noise amplifiers Gain Circuit stability Integrated circuit modeling Stability analysis

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DC electricity generation from dynamic polarized water-semiconductor interface

arXiv

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arXiv 2020年

作者： Yan, Yanfei Zhou, Xu Feng, Sirui Lu, Yanghua Qian, Jianhao Zhang, Panpan Yu, Xutao Zheng, Yujie Wang, Fengchao Liu, Kaihui Lin, Shisheng College of Microelectronics College of Information Science and Electronic Engineering Zhejiang University Hangzhou310027 China State Key Laboratory of Modern Optical Instrumentation Zhejiang University Hangzhou310027 China State Key Lab for Mesoscopic Physics and Frontiers Science Center for Nano-Optoelectronics Collaborative Innovation Center of Quantum Matter School of Physics Peking University Beijing100871 China CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern Mechanics CAS Center for Excellence in Nanoscience University of Science and Technology of China Hefei230027 China

Liquid electricity generator and hydrovoltaic technology have received numerous attentions, which can be divided into horizontal movement generator and vertical movement generator. The horizontal movement generator is limited for powering the integrated and miniaturized energy chip as the current output direction is depending on the moving direction of the water droplet, which means a sustainable and continuous direct current output can be hardly achieved because of the film of limited length. On the other hand, the existing vertical movement generators include triboelectricity or humidity gradient-based liquid electricity generator, where the liquid or water resource must be sustainably supplied to ensure continuous current output. Herein, we have designed an integratable vertical generator by sandwiching water droplets with semiconductor and metal, such as graphene or aluminum. This generator, named as polarized liquid molecular generator (PLMG), directly converts the lateral kinetic energy of water droplet into vertical direct-electricity with an output voltage of up to ~1.0 v from the dynamic water-semiconductor interface. The fundamental discovery of PLMG is related to the non-symmetric structure of liquid molecules, such as water and alcohols, which can be polarized under the guidance of built-in field caused by the Fermi level difference between metal and semiconductor, while the symmetric liquid molecules cannot produce any electricity on the opposite. Integratable PLMG with a large output power of ~90 nW and voltage of ~2.7 v has been demonstrated, meanwhile its small internal resistance of ~250 kΩ takes a huge advantage in resistance matching with the impedance of electron components. The PLMG shows potential application value in the Internet of Things after proper miniaturization and integration. Copyright © 2020, The Authors. All rights reserved.

关键词： Liquids

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A CRITICAL TOPOLOGICAL REvIEW FOR MICROWAvE POWER MODULES

A CRITICAL TOPOLOGICAL REVIEW FOR MICROWAVE POWER MODULES

引用

The 10th International Conference on Power Electronics, Machines and Drives (PEMD 2020)

作者： J. M. Holland v. Pickert M. A. Elgendy G. Henderson School of Engineering Newcastle University Newcastle United Kingdom TMD Technologies London United Kingdom

Recently, developments in Microwave Power Module (MPM) technologies have transformed to adapt to wider varieties of emerging radar and communication system needs. A renewed interest in MPM technology has emerged due to the possibility of significant reductions in size, weight, and efficiency when compared to standalone solid-state and travelling wave tube (TWT) amplifier systems. designing the electronic power conditioner (EPC) for an MPM is not a trivial task. The need to reduce both size and weight is in direct conflict with the required specification of an MPM, which requires multiple high voltage outputs in the kilovolt range with very low steady-state and dynamic output voltage ripple to ensure phase-noise stability of the tube. Furthermore, the transient behaviour of the MPM is particularly challenging, with output pulsing schemes ranging from long, slow pulses for high position fidelity and short, fast pulses for accurate dynamic tracking. During this time, the TWT beam current changes from full load to zero load. This paper focusses on the design of the EPC and outlines a critical analysis of the key enabling technological factors and topological choices that demonstrate how to meet such demanding specifications, and how standard approaches will most likely be sub-optimum.

关键词： travelling wave amplifiers microwave tubes phase noise transient analysis

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