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conference on 2D Photonic Materials and Devices v Part of SPIE Photonics West OPTO conference

作者： Luo, Manlin Sun, Hao Qi, Zhipeng Lu, Kunze Chen, Melvina Kang, Dong-Ho Kim, Youngmin Burt, Daniel Yu, Xuechao Wang, Chongwu Kim, Young Duck Duck, Young Wang, Qi-Jie Nam, Donguk Nanyang Technol Univ Sch Elect & Elect Engn 50 Nanyang Ave Singapore 639798 Singapore Nanyang Technol Univ Sch Phys & Math Sci 21 Nanyang Link Singapore 637371 Singapore Nanjing Univ Informat Sci & Technol Sch Phys & Optoelect Engn Nanjing 210044 Peoples R China Gwangju Inst Sci & Technol Sch Elect Engn & Comp Sci Gwangju 61005 South Korea Kyung Hee Univ Dept Phys Seoul 02477 South Korea

ISBN: (纸本)9781510648784;9781510648777

The potential for establishing energy gaps by pseudo-magnetic fields in strain-engineered graphene has sparked much interest recently. However, the limited sizes of induced pseudo-magnetic fields and the complicated platforms for straining graphene have thus far prevented researchers from harnessing the unique pseudo-magnetic fields in optoelectronic devices. In this work, we present an experimental demonstration of triaxially strained suspended graphene structures capable of obtaining quasi-uniform pseudo-magnetic fields over a large scale. The novel metal electrode design functions as both stressors and current injectors. We also propose a hybrid laser structure employing a 2D photonic crystal and triaxially strained graphene as an optical cavity and gain medium, respectively.

关键词： Strain engineering graphene pseudo-magnetic fields laser structure optoelectronic devices

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Improved traffic signal light recognition algorithm based on YOLO v3

Improved traffic signal light recognition algorithm based on...

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2022 International conference on Optics and Machine vision, ICOMv 2022

作者： Yu, Feng Zhong, Mingen Tang, Shifu Zheng, Zhonggang Xiamen University of Technology Jimei Xiamen China

ISBN: (纸本)9781510653238

Aiming at the problems of misdetection and missed detection in traffic signal detection tasks in current traffic scenes, this paper proposes an improved YOLO v3 traffic signal recognition algorithm YOLO v3-SimAM. First, introduce the new attention mechanism SimAM to enhance the features;secondly, add the SSH network structure after the feature layer extracted by the FPN feature pyramid to expand the deep network receptive field to further strengthen the feature extraction;finally, the last convolution of YOLO Head is replaced with dynamic convolution to improve the accuracy of target frame detection. At the same time, in the loss function design, the original intersection ratio (IoU) loss function is replaced with the DIoU loss function, and finally the YOLO v3-SimAM algorithm is formed. The algorithm is applied to traffic signal detection tasks. On the public TTTL (Tsinghua-Tencent Traffic Light) data set, the average accuracy of the algorithm (mAP) index reached 67.67%, which is an increase of 1.2% compared with the YOLO v3 algorithm. The results show that compared with the original YOLO v3 algorithm, the YOLO v3-SimAM algorithm proposed in this paper can detect traffic lights more accurately. © 2022 SPIE

关键词： Traffic signals

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MEMS devices based on self-organizing semiconductors structures 14

MEMS devices based on self-organizing semiconductors structu...

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14th International conference on Micro- and Nano-Electronics 2021, ICMNE 2021

作者： Denisenko, Mark A. Isaeva, Alina S. Lysenko, Igor E. Tkachenko, Alexey v. Southern Federal University Rostov-on-Don region Taganrog347922 Russia

ISBN: (数字)9781510651913

ISBN: (纸本)9781510651906

In this paper, we consider a method for constructing MEMS structures using a self-assembly operation based on controlled self-organization of mechanically stressed semiconductor layers. This work describes the design of highly sensitive tunneling linear acceleration sensors, as well as a nanoelectromechanical switch with two tunnel contacts. Accelerometers of this type have important advantages: hypersensitivity due to the tunnel effect, small dimensions compared to capacitive accelerometers, design flexibility due to wide construction variations depending on requirements, potential possibility of manufacturing structures with three axes of sensitivity in a single technological production cycle, high manufacturability. Tunneling nanoelectromechanical switches also have several advantages: such as low leakage current, energy efficiency, stability, good dynamic characteristics, and can be used in ultra-low-power electronics. © 2022 SPIE.

关键词： Accelerometers

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Improving the Performance of ZnO Nanorod Piezoelectric Nanogenerators by Tuning the PEDOT: PSS as an Intermediate Layer

Improving the Performance of ZnO Nanorod Piezoelectric Nanog...

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International Laser Technology and Optics Symposium 2024, iLATOS2024

作者： Asmarita, Yulmaisi Dwi Fadhullah, Naufal Fiego Mufti, Nandang Pujiarti, Herlin Paradita, Dhea Kurniawan, Robi Salim, Ali Aqeel Ismail, Hasan Department of Physics Faculty of Mathematics and Natural Sciences Universitas Negeri Malang Malang65145 Indonesia Center of Advanced Material for Renewable Energy Universitas Negeri Malang Malang65145 Indonesia Universiti Teknologi Malaysia Johor Johor Bahru81310 Malaysia Department of Mechanical Engineering Universitas Negeri Malang Malang65145 Indonesia

The coating design of a piezoelectric nanogenerator (PENG) was optimised to enhance the performance of ZnO nanorod-based PENGs by fine-tuning the PEDOT: PSS intermediate layer. ZnO nanorods were synthesised using the hydrothermal method at 90°C for 5 hours. The PEDOT: PSS layer was deposited via spin coating at rotation speeds (2000-5000 rpm). Furthermore, PDMS and Cu material layers were deposited using spin coating and magnetron sputtering, respectively, ensuring optimal layer characteristics for improved energy harvesting efficiency. The PENGs were fabricated with a material structure of ITO-PET/ZnO/PEDOT: PSS/PDMS/Cu. various characterization tools including XRD, SEM, Uv-vis, and voltage-current (I-v) measurements were used to determine the materials’ structural, surface morphological, optical properties and their impact on PENG performance. The XRD diffraction patterns of ZnO nanorods coated with PEDOT: PSS revealed a hexagonal wurtzite crystal structure and amorphous phase with a lattice fringe of ~0.52 nm and a crystal size of ~67.91 nm. SEM analysis determined that the average diameter of ZnO nanorod was 67.2 ± 0.48 nm with a thickness of 1297 ± 29.22 nm. The absorption spectra of ZnO/PEDOT: PSS layers were observed in the range of 260-380 nm with an energy bandgap of 3.28 to 3.13 nm, indicating that a thicker PEDOT: PSS layer, resulted in a smaller bandgap with higher PENG conductivity at 8.97 Watt. © 2025 Institute of Physics Publishing. All rights reserved.

关键词： Spin coating

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The Giant Magellan Telescope Mount: The Core of a Next Generation 25.4-m aperture ELT 9

The Giant Magellan Telescope Mount: The Core of a Next Gener...

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conference on Ground-based and Airborne Telescopes IX

作者： Burgett, W. Park, S. Beifus, K. Echols, C. Lam, K-M Loewen, N. Smith, B. Ashby, D. Bernstein, R. GMTO Corp 465 N Halstead StSuite 250 Pasadena CA 91107 USA Sightline Engn Ltd 1493 Paisley Rd N Vancouver BC V7R 1C4 Canada X Double Dot LLC POB 99 Flagstaff AZ 86002 USA Steward Observ 933 N Cherry Ave Tucson AZ 85719 USA

ISBN: (纸本)9781510653467;9781510653450

The Giant Magellan Telescope (GMT) is one of three planned ground-based optical/IR Extremely Large Telescopes (ELTs) that will provide a generational leap in ground-based optical/IR capability. The GMTO Corp. completed in 2019 a multi-stage acquisition process that led to the selection of OHB Digital Connect (formerly MT-Mechatronics or MTM) and Ingersoll Machine Tools (IMT) to supply the final design, fabrication, and installation of the GMT Mount. The similar to 2000 metric ton GMT Mount comprises the telescope structures, mechanisms, and utilities but does not include the optics and science instruments. This paper provides a general overview of the technical scope of the GMT Mount including the key and driving requirements, systems engineering framework, and planned design development. Due to the GMT site location in Chile, the Mount design must accommodate a challenging seismic environment. Major Mount subsystems are also described including the Hydrostatic Bearing System (HBS), Gregorian Instrument Rotator (GIR), and the Azimuth Track and its interface to the telescope Pier. In addition, a summary is presented of the design path forward to the Final design Review (FDR) from the point of completing the Preliminary design Review (PDR) in early 2021, including the current status of critical prototyping efforts. Finally, management processes are outlined that are necessary to execute the Mount design-build contract spanning the next 8-9 years.

关键词： GMT GMTO Giant Magellan Telescope ELT Extremely Large Telescope Mount

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FDTD Analysis of Nanowire Based InP/Ge Tandem Solar Cell for Enhanced Power Conversion Efficiency 3rd

FDTD Analysis of Nanowire Based InP/Ge Tandem Solar Cell for...

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3rd International conference on Energy Systems, Drives and Automations, ESDA 2020

作者： Agnihotri, Suneet Kumar Prashant, D.v. Samajdar, Dip Prakash Nanoscale Device Circuit and System Design Lab Electronics and Communication Engineering Discipline PDPM-Indian Institute of Information Technology Jabalpur482005 India

ISBN: (纸本)9789811672736

The use of nanostructures over traditional bulk and thin film solar cells increases the absorption of light due to the coupled effects of intrinsic antireflection and strong excitation of resonance modes. Therefore, to increase the absorption over the wavelength of 300 to 1600 nm, InP nanowires (NWs) are grown on Ge substrates to design tandem solar cells, which particularly broaden the absorbed solar spectrum. In this article, we have performed the optical simulation and optimized the dimensions of the InP NWs such as period, diameter, and height of the InP NW and thickness of Ge substrate for current matching between the two sub cells using the FDTD simulation software. The performance parameters such as Photogeneration rate, Electric-field, and absorption power are compared by considering different simulation regions of InP NWs only, Ge substrate only, and combination of InP NW and Ge substrate. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Nanowires

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design of Modular Multilevel Converter Based on STM32 4

Design of Modular Multilevel Converter Based on STM32

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4th International conference on Power and Energy Technology, ICPET 2022

作者： Huang, Zucun Song, Shuxiang Luo, Dan Liao, Zhixian Chen, Yugang Guangxi Normal University Faculty of Electronic Engineering Guilin China

ISBN: (数字)9781665480796

ISBN: (纸本)9781665480796

Aiming at the problems of high hardware cost and high programming difficulty in the design of modular multilevel converter (MMC) experimental prototype, a single-phase H-bridge MMC experimental prototype with a rated capacity of 600v/3KW based on STM32 is designed. STM32 with timer, Analog-to-Digital Converter (ADC), and Digital-to-Analog Converter (DAC) functions is used as the controller chip, which reduces the hardware cost and the difficulty of circuit design. STM32 is programmed with easy-to-understand C language, which reduces the difficulty of programming language. The optical fiber communication module is used to connect the serial ports of two single-chip microcomputers to realize the electrical isolation between two independent modules and ensure the reliability of the experimental prototype. The isolation drive chip and isolation sampling operational amplifier are used to realize the electrical isolation of strong current and weak current and improve the stability of the system. The carrier phase-shifting modulation strategy is adopted to control the MMC sub-module. The experimental results show that under the control of carrier phase-shifting modulation strategy of STM32 single-chip microcomputer, the alternating current (AC) voltage and current output by the prototype MMC prototype are smooth and sinusoidal, and the system can operate stably at 220v/3KW for a long time. Compared with the scheme using FPGA + DSP as the controller, STM32 has more advantages in hardware cost, circuit design and software programming. It is suitable for the application of prototype MMC experiment with a small number of sub modules. © 2022 IEEE.

关键词： Bridge circuits

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A Multimodal and Multifunctional CMOS Cellular Interfacing Array for Digital Physiology and Pathology Featuring an Ultra Dense Pixel Array and Reconfigurable Sampling Rate

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IEEE TRANSACTIONS ON BIOMEDICAL CIRCUITS AND SYSTEMS 2022年第6期16卷 1057-1074页

作者： Wang, Adam Y. Y. Sheng, Yuguo Li, Wanlu Jung, Doohwan Junek, Gregory v. v. Liu, Hangxing Park, Jongseok Lee, Dongwon Wang, Mian Maharjan, Sushila Kumashi, Sagar Hao, Jin Zhang, Yu S. S. Eggan, Kevin Wang, Hua Georgia Inst Technol Sch Elect & Comp Engn Atlanta GA 30332 USA Swiss Fed Inst Technol Dept Informat Technol & Elect Engn CH-8092 Zurich Switzerland Harvard Med Sch Brigham & Womens Hosp Dept Med Div Engn Med Cambridge MA 02139 USA Harvard Univ Harvard Stem Cell Inst Dept Stem Cell & Regenerat Biol Cambridge MA 02138 USA

The article presents a fully integrated multimodal and multifunctional CMOS biosensing/actuating array chip and system for multi-dimensional cellular/tissue characterization. The CMOS chip supports up to 1,568 simultaneous parallel readout channels across 21,952 individually addressable multimodal pixels with 13 mu m x 13 mu m 2-D pixel pitch along with 1,568 Pt reference electrodes. These features allow the CMOS array chip to perform multimodal physiological measurements on living cell/tissue samples with both high throughput and single-cell resolution. Each pixel supports three sensing and one actuating modalities, each reconfigurable for different functionalities, in the form of full array (FA) or fast scan (FS) voltage recording schemes, bright/dim optical detection, 2-/4-point impedance sensing (ZS), and biphasic current stimulation (BCS) with adjustable stimulation area for single-cell or tissue-level stimulation. Each multi-modal pixel contains an 8.84 mu m x 11 mu m Pt electrode, 4.16 mu m x 7.2 mu m photodiode (PD), and in-pixel circuits for PD measurements and pixel selection. The chip is fabricated in a standard 130nm BiCMOS process as a proof of concept. The on-chip electrodes are constructed by unique design and in-house post-CMOS fabrication processes, including a critical Al shorting of all pixels during fabrication and Al etching after fabrication that ensures a high-yield planar electrode array on CMOS with high biocompatibility and long-term measurement reliability. For demonstration, extensive biological testing is performed with human and mouse progenitor cells, in which multidimensional biophysiological data are acquired for comprehensive cellular characterization.

关键词： Sensors Biomedical monitoring optical arrays Biosensors voltage measurement voltage control Pathology Biosensor cell-based assay cellular recording COvID-19 digital pathology digital physiology high resolution high throughput impedance sensing microelectrode array (MEA) multifunctionality multimodality optical detection pandemic parallel recording stimulation switch matrix (SM)

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Analysis of Isolated Bi-Directional CLLC DC-DC Converters for Fast Electric-vehicle (Ev) Battery Charging 3

Analysis of Isolated Bi-Directional CLLC DC-DC Converters fo...

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3rd IEEE International conference on Industrial Electronics: developments and Applications, ICIDeA 2025

作者： Mallick, Dhirendra Kumar Swain, Sarat Chandra Sahu, Pradeep Kumar Jena, Satyaranjan Roy, Suchismita Dash, Ritesh School of Electrical Engineering KIIT Deemed to be University Bhubaneswar India School of EEE REVA University Bangalore India

ISBN: (纸本)9798331533205

Bidirectional onboard chargers play a vital role in electric vehicles (Evs), contributing to smart grid applications by enabling functions such as peak load management and supporting grid stability through frequency and voltage regulation. However, traditional full-bridge dual-active bridge (FBDAB) resonant converters commonly used in these systems face considerable efficiency losses, particularly during reverse power flow and when operating away from their resonant frequency-a condition often caused by fluctuations in battery voltage. To overcome these challenges, this paper presents a bidirectional battery charger based on a CLLC resonant converter with efficient tracking mechanism. The converter's steady-state behavior is analyzed under both grid-to-vehicle (G2v) charging and vehicle-to-grid (v2G) discharging conditions. By maintaining the switching frequency close to the ideal resonant point, this design successfully lowers circulating currents in the resonant tank and transformer, decrease losses in MOSFETs, and limits the rate of current change in the diodes. Simulations comparing this approach to a FBDAB resonant converter with fixed DC demonstrate the enhanced efficiency and superior performance of the proposed system. © 2025 IEEE.

关键词： Electric power transmission networks

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Accurate Controllable 325W Laser Diode Driver for optical Inter-Satellite Links

Accurate Controllable 325W Laser Diode Driver for Optical In...

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European Space Power conference (ESPC)

作者： Martin Persson Truls Mjelde Andersen Bjarne Soderberg Steen Brandi Product Line Management Micross Hi-Rel Power Solutions Herlev Denmark R&D Engineering Micross Hi-Rel Power Solutions Herlev Denmark

A 325W radiation hard, controlled current source is developed and qualified for use in optical inter-satellite communication links. The nature of the application requires accurate control of the current setpoint from 0.5A to 10A as well as adjustable maximum output voltage from 3v to 32.5v to ensure protection of the laser diodes. The wide range of operating conditions pose a challenge to ensure proper gain and phase margin while meeting requirements for transient response to load step and setpoint changes. The control scheme is an augmentation of peak current mode control to include separate setpoints for the voltage control and average current mode control which has proven effective in meeting the application requirements. This paper presents the converter topology, control scheme design and methods for radiation hardening of the circuits. The achieved performance of the current source is demonstrated by measurements on the manufactured hardware.

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