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Experimental demonstration of a flexible-grid 1×(2×3)mode-and wavelength-selective switch using silicon microring resonators and counter-tapered couplers

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Chinese Optics Letters 2024年第1期22卷 52-58页

作者：孔德军鲁昊汪鹏君符强戴世勋陈伟伟王栎沣张波豪马凌霄李军戴庭舸杨建义 Faculty of Electrical Engineering and Computer Science Ningbo UniversityNingbo 315211China College of Electrical and Electronic Engineering Wenzhou UniversityWenzhou 325035China College of Science and Technology Ningbo UniversityNingbo 315300China Laboratory of Infrared Materials and Devices The Research Institute of Advanced TechnologiesNingbo UniversityNingbo 315211China Department of Information Science and Electronics Engineering and Cyrus Tang Center for Sensor Materials and Applications Zhejiang UniversityHangzhou 310027China

A flexible-grid 1×(2×3)mode-and wavelength-selective switch which comprises counter-tapered couplers and silicon microring resonators has been proposed,optimized,and demonstrated experimentally in this *** carefully thermally tuning phase shifters and silicon microring resonators,mode and wavelength signals can be independently and flexibly conveyed to any one of the output ports,and different bandwidths can be generated as *** particle swarm optimization algorithm and finite difference time-domain method are employed to optimize structural parameters of the twomode(de)multiplexer and crossing *** bandwidth-tunable wavelength-selective optical router composed of12 microring resonators is studied by taking advantage of the transfer matrix *** results show that,for the fabricated module,cross talk less than-10.18 dB,an extinction ratio larger than 17.41 d B,an in-band ripple lower than0.79 dB,and a 3-dB bandwidth changing from 0.38 to 1.05 nm are obtained,as the wavelength-channel spacing is 0.40 *** corresponding response time is measured to be 13.64μs.

关键词： integrated optics optical waveguide mode-and wavelength-selective switch

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Quantum Dots and Chalcogenide Glass Composites for Near and Mid Infrared Emission

Quantum Dots and Chalcogenide Glass Composites for Near and ...

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The 24th International Conference on Glass( ICG Congress 2016 Shanghai) (第24届国际玻璃大会)

作者： Chao Liu Jihong Zhang Xiujian Zhao Jong Heo Nan Ei Yu Myoung-Kyu Oh Bok Hyeon Kim Spectroscopy Sensor Laboratory Advanced Photonics Research Institute (APRI) Gwangju Institute of Science and Technology (GIST)Gwangju 500-712 Republic of Korea State Key Laboratory of Silicate Materials for Architectures Wuhan University of Technology Wuhan Hubei 430070 P.R.China State Key Laboratory of Silicate Materials for Architectures Wuhan University of Technology Wuhan Hubei 430070 P.R.China Division of Advanced Nuclear Engineering Center for information materials and Department of Materials Science and EngineeringPohang University of Science and Technology (POSTECH) Pohang Gyeongbuk 790-784 Republic of Korea Spectroscopy Sensor Laboratory Advanced Photonics Research Institute (APRI) Gwangju Institute of Science and Technology (GIST)Gwangju 500-712 Republic of Korea

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Electrically driven motion, destruction, and chirality change of polar vortices in oxide superlattices

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Science China(Physics,Mechanics & Astronomy) 2022年第3期65卷 77-84页

作者： Pan Chen Congbing Tan Zhexin Jiang Peng Gao Yuanwei Sun Lifen Wang Xiaomei Li Ruixue Zhu Lei Liao Xu Hou Ke Qu Ning Li Xiaomin Li Zhi Xu Kaihui Liu Wenlong Wang Jinbin Wang Xiaoping Ouyang Xiangli Zhong Jie Wang Xuedong Bai Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China International Center for Quantum Materials Electron Microscopy LaboratorySchool of PhysicsPeking UniversityBeijing 100871China Hunan Provincial Key Laboratory of Intelligent Sensors and Advanced Sensor Materials School of Physics and ElectronicsHunan University of Science and TechnologyXiangtan 411201China Department of Engineering Mechanics Zhejiang UniversityHangzhou 310027China Collaborative Innovation Center of Quantum Matter Beijing 100871China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China State Key Laboratory for Artificial Microstructure&Mesoscopic Physics School of PhysicsPeking UniversityBeijing 100871China School of Materials Science and Engineering Xiangtan UniversityXiangtan 411105China Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province Zhejiang UniversityHangzhou 310027China

Topological polar vortices, which are electric analogs of magnetic objects, present great potential in applications of future nanoelectronics because of their nanometer size, anomalous dielectric response, and chirality. To enable the functionalities, it is prerequisite to manipulate the polar states and chirality by using external stimuli. Here, we probe the evolutions of polar state and chirality evolutions of topological polar vortices in Pb TiO;/Sr TiO;superlattices under an electric field by using atomically resolved in situ scanning transmission electron microscopy and phase-field simulations. We find that, under electric field, the chiral vortex cores can be moved laterally to form close-pair structures, transform into a/c domain stripes, and finally become a nonchiral c-domain. Such transition is reversible and spontaneous after bias removal. Interestingly, during switching and backswitching events, the vortex rotation can be changed, offering a potential strategy to manipulate vortex chirality. The revealed dynamic behavior of individual polar vortices at the atomic scale provides fundamentals for future device applications.

关键词： chirality polar vortex ferroelectrics in situ transmission electron microscopy phase-field simulations

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Dynamic relaxation process of a 3D super crystal structure in a Cu:KTN crystal

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Chinese Optics Letters 2020年第2期18卷 61-65页

作者： Quanxin Yang Xin Zhang Hongliang Liu Xuping Wang Yingying Ren Shan He Xiaojin Li Pengfei Wu Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Institute of Modern OpticsNankai UniversityTianjin 300071China Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices Hubei University of Arts and ScienceXiangyang 441053China Advanced Materials Institute Qilu University of Technology(Shandong Academy of Sciences)Jinan 250014China Shandong Provincial Engineering and Technical Center of Light Manipulations&Shandong Provincial Key Laboratory of Optics and Photonic Device School of Physics and ElectronicsShandong Normal UniversityJinan 250358China

In this Letter,we report the existence and relaxation properties of a critical phenomenon on called a 3D super crystal that emerges at T=TC?3.5℃,that is,in the proximity of the Curie temperature of a Cu:KTN *** dynamics processes of a 3D super crystal manifest in its formation containing polarized nanometric regions and/or polarized ***,with strong coupling and interaction of microcomponents,the characteristic relaxation time measured by dynamic light scattering demonstrates a fully new relaxation mechanism with a much longer relaxation *** the relaxation mechanism of a relaxator is so-far undetermined,this research provides a novel *** results can help structure a fundamental theory of ferroelectric relaxation.

关键词： KTN relaxation time dynamic light scattering micronano structure

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Optimal Transmission Power in a Nonlinear VLC System

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ZTE Communications 2016年第2期14卷 23-28页

作者： ZHAO Shuang CAI Sunzeng KANG Kai QIAN Hua Shanghai Institute of Microsystem and Information Technology Chinese Academy of SeieneesShanghai 200050China Key Laboratory of Wireless Sensor Network&Communication Chinese Academy of SciencesShanghai 200335China Shanghai Research Center for Wireless Communications Shanghai 201210China Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201210China

In a visible light communication （VLC） system, the light emitting diode （LED） is nonlinear for large signals, which limits the trans- mission power or equivalently the coverage of the VLC system. When the input signal amplitude is large, the nonlinear distortion creates harmonic and intermodulation distortion, which degrades the transmission error vector magnitude （EVM）. To evaluate the impact of nonlinearity on system performance, the signal to noise and distortion ratio （SNDR） is applied, defined as the linear signal power over the thermal noise plus the front end nonlinear distortion. At a given noise level, the optimal system performance can be achieved by maximizing the SNDR, which results in high transmission rate or long transmission range for the VLC system. In this paper, we provide theoretical analysis on the optimization of SNDR with a nonlinear Hammerstein model of LED. Simulation results and lab experiments validate the theoretical analysis.

关键词： nonlinearity light emitting diode （LED） SNDR

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Low-Cost Fluorescence-Based Temperature Sensing System for Neonatal Care

Low-Cost Fluorescence-Based Temperature Sensing System for N...

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IEEE sensors

作者： Kirit Chatterjee Hung Lam Ryan Robucci Govind Rao Yordan Kostov Departement of Computer Science and Electrical Engineering University of Maryland Baltimore County 1000 Hilltop Circle Baltimore MD 21250 Center for Advanced Sensor Technology and Department of Chemical Biochemical and Environmental Engineering University of Maryland Baltimore County 1000 Hilltop Circle Baltimore MD 21250

ISBN: (纸本)9781467346412

A remotely-measured fluorescence-based temperature measurement system designed for neonatal care is built and presented using a low-cost, off-the-shelf camera-phone image sensor. The fluorophore-based sensor salve removes the need of attaching thermistor probes using adhesives to the neonate's skin;and therefore reduces the risk of epidermal stripping, microbial infections, etc. The system performs low-cost yet precise remote ratiometric measurements of our thermometric fluorescent salve using only a 10-bit, 120-FPS CMOS imager. An FPGA handles control and capture of image data in the region of interest with frames synchronized with a pulsing illuminator. A minimalistic algorithm using basic pixel-summations and division to compute a ratio is presented, suitable for implementation on a minimal embedded system. The resolution of the system is reported to be at least 0.18 degrees Celcius.

关键词： temperature measurement system Ointments Newborn Infant image data region of interest temperature sensing adhesives Ratiometric Measurement

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Third Harmonic Generation in Ge:Ga pumped by FLARE

Third Harmonic Generation in Ge:Ga pumped by FLARE

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International Conference on Infrared and Millimeter Waves

作者： K. Saeedi A.F.G. Van Der Meer N. Dessmann S.G. Pavlov N. V. Abrosimov B. Redlich B. Murdin HFML-FELIX Radboud University Nijmegen The Netherlands Institute of Optical Sensor Systems German Aerospace Center (DLR) Berlin Germany Leibniz-Institut für Kristallzüchtung (IKZ) Berlin Germany Advanced Technology Institute and Department of Physics University of Surrey Guildford UK

ISBN: (数字)9781728194271

ISBN: (纸本)9781728194288

We observe third-harmonic generation (THG) in gallium-doped germanium (Ge:Ga) upon pumping with picosecond sub-THz (0.6-0.7 THz) pulses from the THz free-electron laser FLARE with a peak electric field strength of up to 4 kV/cm (30kW/cm2). The measurements are performed at cryogenic temperatures where the majority of holes are bound to the acceptor dopants. The dependence of the THG on the pump intensity exhibits a threshold-free power-law behavior with an exponent close to 3 as expected.

关键词： Free electron lasers Measurement by laser beam Cryogenics Germanium Frequency conversion Laser excitation Behavioral sciences

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Effect of Background Color on Rice Seed Image Segmentation Using Machine Vision

Effect of Background Color on Rice Seed Image Segmentation U...

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International Conference on Computational Approach in Smart Systems Design and Applications (ICASSDA)

作者： Rashidah Ruslan Muhammad Firdaus Ibrahim Siti Khairunniza-Bejo Aimi Athirah Aznan Ibni Hajar Rukunudin Fathin Ayuni Azizan Department of Biological and Agricultural Engineering Universiti Putra Malaysia UPM Serdang Selangor Malaysia Center of Excellence for Advanced Sensor Technology (CEASTech) Universiti Malaysia Perlis UniMAP Arau Perlis Malaysia School of Bioprocess Engineering Universiti Malaysia Perlis UniMAP Arau Perlis Malaysia

ISBN: (纸本)9781538683705

One of the crucial part in the development of machine vision for rice seed identification are the design of the seed holder itself. In this project, seed holder was designed to hold rice seed for image acquisition purposes. Four different colors such as black, blue, green and red was painted on the seed holder. Effect of background colors on rice seeds image segmentation were tested under machine vision setup. Simple rice seed parameters such as seed length and width were measured using image processing technique programmed in LabVIEW software. Percentage error for each background color was calculated based on the actual length and width of the rice seed. Blue background color was found to provide good contrast for estimation of length and width with accuracy less than 2% and 5%, respectively.

关键词： Image color analysis Machine vision Length measurement Measurement uncertainty Agriculture Manuals

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A Methodology for Verifying and Validating the Functional Performance Evaluation of High-Fidelity RADAR sensor Models at Raw Data and Detection Levels

A Methodology for Verifying and Validating the Functional Pe...

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International Conference on Vision, Image and Signal Processing (ICVISP)

作者： Arsalan Haider Lukas Haas Abduelkadir Eryildirim Thomas Zeh Shotaro Koyama Nils Henning Müllner Martin Jakobi Alexander W. Koch IFM-Institute for Driving Assistance and Connected Mobility Kempten University of Applied Sciences Germany Institute for Measurement Systems and Sensor Technology Technical University of Munich Germany Infineon Technologies Austria AG Advanced Vehicle Research Institute Kanagawa Institute of Technology Japan Institute of Transportation Systems German Aerospace Center DLR Germany

ISBN: (数字)9798331541460

ISBN: (纸本)9798331541477

This paper outlines a comprehensive methodology for verifying and validating the functional performance evaluation of high-fidelity radio detection and ranging (RADAR) sensor models at both the raw data level, specifically the range map (RM) and range-Doppler map (RDM), and the detection level. Three key performance parameters (KPPs) are defined at the raw data level: the target's received power, signal-to-noise ratio (SNR), and twoway beam pattern. Four KPPs are identified at the detection level: distance, relative radial velocity, azimuth angle, and elevation angle. This study also introduces three dynamic test scenarios directly applicable to the functional evaluation assessment of RADAR sensor models. Furthermore, a toolchain is presented to integrate real-world test scenarios into the virtual environment, allowing for frame-by-frame validation of the RADAR sensor models' functional evaluation. Quantitative analysis successfully assesses differences between simulations and real measurements, employing the mean absolute percentage error (MAPE) metric. This methodology has been successfully applied to a high-fidelity RADAR sensor model featuring a multiple input and multiple output (MIMO) 2D linear spacing virtual antenna and a complete signal processing toolchain that mimics real RADAR sensors. Results show a strong correlation between the simulation and real measurements, with MAPE values below 7 % for all defined KPPs at raw data and detection levels. Using this methodology, developers can assess whether virtual RADAR sensors are ready for environmental perception during scenario-based automated driving system (ADS) testing.

关键词： Performance evaluation Correlation Radar detection Radar Radar antennas Data models Radar signal processing Distance measurement Signal to noise ratio Testing

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Synthesis of a Conducting Polymer - Polyaniline - based Layers Suitable for the Application in Electrochromic sensors

Synthesis of a Conducting Polymer - Polyaniline - based Laye...

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International Conference on Nanomaterials: Application & Properties (NAP)

作者： Arunas Ramanavičius Megha A. Deshmukh Gintautas Bagdžiūnas Mahendra D. Shirsat Almira Ramanavičiene Laboratory of NanoTechnology State Research Institute Center for Physical Sciences and Technology Savanoriu ave. 231 Vilnius Lithuania RUSA-Center for Advanced Sensor Techonology Dr. Babasaheb Ambedkar Marathwada University Aurangabad MS India Faculty of Chemistry and Geosciences Vilnius University Naugarduko st. 24 Vilnius Lithuania

Electrochemically deposited conducting polymer polyaniline (PANI) electrochromic films were deposited onto the indium tin oxide (ITO) coated glass electrodes and their electrochromic performances were investigated by using spectrophotometric and electrochemical methods. Optical performance of PANI film was evaluated by measuring spectroscopic signals before and after the incubation of PANI film coated electrode in ammonia and some metal ion containing solutions. The most significant alteration of electrochromic effect was observed after an incubation of PANI/ITO-modified electrode in Cu(II) ion containing solution. The conditions at which the PANI films exhibit the highest optical contrast have been determined. Applicability of PANI/ITO-electrodes for electrochromic effect-based determination of Cu(II) ions has also been discussed.

关键词： Optical sensors Optical films Ions Electrodes Adaptive optics Optical polymers

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