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International Conference on Infrared, Millinmeter, and Terahertz Waves

作者： Lan Wang Yaxin Zhang Shixiong Liang Zongjun Shi Ziqiang Yang Terahertz Science Cooperative Innovation Center University of Electronic Science and Technology of China Chengdu China National Key Laboratory of Application Specific Integrated Circuit Hebei Semiconductor Research Institute Shijiazhuang China

We demonstrate a classical analogue of electromagnetically induced transparency (EIT) in a planar terahertz metamaterial comprised of uneven ring resonators. Here we present control of EIT through tuning of thickness ... 详细信息

关键词： Couplings Metamaterials Resonators Optical ring resonators Substrates Electric fields Magnetic resonance

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Suppressing Intentional Electromagnetic Interference (IEMI) in Wireless Communication System Using Complex Signal Spectrum Shifting Technique

Suppressing Intentional Electromagnetic Interference (IEMI) ...

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IEEE Symposium on Electromagnetic Compatibility, Signal Integrity and Power Integrity (EMC, SI & PI)

作者： Jing-Gao Wang Hao Xie Kai-Qi Xiao Ya-Zhou Chen Ji-Xin Chen Yan-Yan Zhang Wen-Yan Yin Innovative Institute of Electromagnetic Information and Electronic Integration Zhejiang University Hangzhou China Science and Technology on Electronic Information control Laboratory Chengdu China National Key Lab of Science and Technology on Electromagnetic Environment Effects Shijia Zhuang China

It is well known that (non)intentional electromagnetic interference (IEMI) can cause the performance degradation and the rise of bit error rate (BER) of wireless communication system. This paper presents the study on suppressing intentional electromagnetic interference in communication system using complex signal spectrum shifting technique. The anti-IEMI techniques are at first introduced, and further, modeling process and simulated results of bit error rate (BER) are given for different signal to noise ratio (SNR) and signal to interference ratio (SIR).

关键词： Frequency shift keying White noise Electromagnetic interference Wireless communication

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An on-chip integrated structure for terahertz band stop filter/absorber based on reflection wave cancellation

An on-chip integrated structure for terahertz band stop filt...

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International Conference on Infrared, Millinmeter, and Terahertz Waves

作者： Ting Zhang Ziqiang Yang Yaxin Zhang Shixiong Liang Zongjun Shi Terahertz Science Cooperative Innovation Center University of Electronic Science and Technology of China Chengdu China National Key Laboratory of Application Specific Integrated Circuit Hebei Semiconductor Research Institute Shijiazhuang China

in this paper, the structure combining complementary split ring resonator (CSRR) and split ring resonator (SRR) with fin line is proposed for band stop filter or waveguide absorber. The results indicated that the proposed structure would reduce the reflection and enhance the absorption by the reflection wave cancellation, which allows filtering and absorbing application in terahertz. The bandwidth can be expanded by increasing the number of resonance cells and the whole structure is very convenient to connect with standard rectangular waveguides.

关键词： Band-pass filters Resonator filters Absorption Reflection Optical ring resonators Interconnected systems Optical waveguides

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A linearized photonic sampling structure by using polarization-dependent modulators in sagnac loop

A linearized photonic sampling structure by using polarizati...

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2017 International Topical Meeting on Microwave Photonics, MWP 2017

作者： Liang, Dong Liu, Yong Li, Xiaojun Tan, Qinggui Jiang, Wei State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Information University of Electronic Science and Technology of China Chengdu China National Key Laboratory of Science and Technology on Space Microwave CAST Xi'an Shaanxi China

ISBN: (纸本)9781538607626

In this paper, a new photonic sampling structure with effective nonlinearity suppression and good signal-to-noise ratio (SNR) performance is proposed. The key feature of this scheme is the polarization-dependent modulators (P-DMZMs) and the sagnac loop structure. Attributing to the polarization sensitive characteristic of P-DMZMs, differences between transfer functions of the fundamental signals and distortions become visible. Meanwhile, the selection of specific biases in P-DMZMs provides the possibility of a preferable linearized performance for real-time photonic sampling. Simulation results indicate that the proposed scheme is capable for effective nonlinearity suppression and provides good SNR performance even in a large frequency range. © 2017 IEEE.

关键词： Polarization

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Drag derived altitude aided navigation method

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Chinese Journal of Aeronautics 2017年第5期30卷 1750-1764页

作者： Hua SONG Meiling WANG Jing YANG Dantong SUN Longtao KONG Chunling WEI School of Automation Science and Electrical Engineering Beihang University Beijing 100083 China Collaborative Innovation Center of Advanced Aero-Engine Beihang University Beijing 100083 China National Key Laboratory of Space Intelligent Control Technology Beijing 100094 China

The navigation problem of the lifting reentry vehicles has attracted much research interest in the past decade. This paper researches the navigation in the blackout zone during the reentry phase of the aircraft, when the communication signals are attenuated and even interrupted by the blackout zone. However, when calculating altitude, a pure classic inertial navigation algorithm appears imprecise and divergent. In order to obtain a more precise aircraft altitude, this paper applies an integrated navigation method based on inertial navigation algorithms, which uses drag derived altitude to aid the inertial navigation during the blackout zone. This method can overcome the shortcomings of the inertial navigation system and improve the navigation accuracy. To further improve the navigation accuracy, the applicable condition and the main error factors, such as the atmospheric coefficient error and drag coefficient error are analyzed in detail. Then the damping circuit design of the navigation control system and the damping coefficients determination is introduced. The feasibility of the method is verified by the typical reentry trajectory simulation, and the influence of the iterative times on the accuracy is analyzed. Simulation results show that iterative three times achieves the best effect.

关键词： Aided navigation system Blackout zone Drag derived altitude Inertial navigation integrated navigation Reentry vehicles

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Lithium‐Sulfur Batteries: Low‐Bandgap Se‐Deficient Antimony Selenide as a Multifunctional Polysulfide Barrier toward High‐Performance Lithium–Sulfur Batteries (Adv. Mater. 4/2020)

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Advanced Materials 2020年第4期32卷

作者： Yuan Tian Gaoran Li Yongguang Zhang Dan Luo Xin Wang Yan Zhao Hui Liu Puguang Ji Xiaohang Du Jingde Li Zhongwei Chen School of Materials Science and Engineering Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology Hebei University of Technology Tianjin 300130 China Department of Chemical Engineering University of Waterloo Waterloo ON N2L 3G1 Canada International Academy of Optoelectronics at Zhaoqing South China Normal University Guangdong 510631 China National–Local Joint Engineering Laboratory for Energy Conservation of Chemical Process Integration and Resources Utilization School of Chemical Engineering and Technology Hebei University of Technology Tianjin 300130 China

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Photo-responsive Helical Motion by Light-Driven Molecular Motors in a Liquid-Crystal Network

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Angewandte Chemie 2021年第15期133卷

作者： Jiaxin Hou Anirban Mondal Guiying Long Dr. Laurens de Haan Dr. Wei Zhao Prof. Guofu Zhou Dr. Danqing Liu Prof. Dirk J. Broer Prof. Jiawen Chen Prof. Ben L. Feringa SCNU-UG International Joint Laboratory of Molecular Science and Displays National Center for International Research on Green Optoelectronics South China Normal University Guangzhou 510006 China Stratingh Institute for Chemistry University of Groningen Nijenborgh 4 9747 AG Groningen The Netherlands SCNU-TUE Joint lab of Device Integrated Responsive Materials (DIRM) Guangdong Provincial Key Laboratory of Optical Information Materials and Technology & Institute of Electronic Paper Displays South China Academy of Advanced Optoelectronics South China Normal University Guangzhou 510006 China Stimuli-responsive Functional Materials and Devices Department of Chemical Engineering and Chemistry Eindhoven University of Technology Den Dolech 2 5600 MB Eindhoven The Netherlands

controlling sophisticated motion by molecular motors is a major goal on the road to future actuators and soft robotics. Taking inspiration from biological motility and mechanical functions common to artificial machines, responsive small molecules have been used to achieve macroscopic effects, however, translating molecular movement along length scales to precisely defined linear, twisting and rotary motions remain particularly challenging. Here, we present the design, synthesis and functioning of liquid-crystal network (LCN) materials with intrinsic rotary motors that allow the conversion of light energy into reversible helical motion. In this responsive system the photochemical-driven molecular motor has a dual function operating both as chiral dopant and unidirectional rotor amplifying molecular motion into a controlled and reversible left- or right-handed macroscopic twisting movement. By exploiting the dynamic chirality, directionality of motion and shape change of a single motor embedded in an LC-network, complex mechanical motions including bending, walking and helical motion, in soft polymer materials are achieved which offers fascinating opportunities toward inherently photo-responsive materials.

关键词： chirality helical motion liquid-crystal network molecular motors photo-responsive motion

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Design of phase matching chessboard-like electromagnetic metasurfaces for wideband radar cross section reduction

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Microwave and Optical technology Letters 2019年第9期61卷

作者： Haiyan Chen Rongbo Shen Fengxia Li Yang Zhou Li Zhang Xiaolong Weng Haipeng Lu Jianliang Xie Longjiang Deng National Engineering Research Center of Electromagnetic Radiation Control Materials State Key Laboratory of Electronic Thin Film and Integrated Device Key Laboratory of Multispectral Absorbing Materials and Structures of Ministry of Education School of Electronic Science Engineering University of Electronic Science and Technology of China Chengdu China

In this article, a chessboard-like electromagnetic metasurfaces which can realize the polarization compensation and cancellation of the reflection beam in microwave region is designed and realized for wideband radar cross section (RCS) reduction. The chessboard-like electromagnetic metasurfaces are composed of a square annular artificial magnetic conductor (AMC) combination with the Jerusalem cross AMC. Simulation and experimental results demonstrate that the chessboard-like electromagnetic metasurfaces exhibit significantly RCS reduction over −10 dB in the frequency bandwidths 6.16-18 GHz, and two RCS reduction peaks at 7.0 and 12.0 GHz in the considering frequency ranges for the normal incidence of an electromagnetic wave. The physical mechanisms of the RCS reduction peaks can be elucidated by the phase matching technology similar to the impedance matching technology applied to radar absorbing materials (RAMs). The basic physical property implies that RCS reduction based on the composite AMC metasurfaces can be improved greatly by introducing as many phase matching points as possible in the functional frequency bands. Considered that the phase matching is a necessary condition rather than a sufficient condition for RCS reduction of the chessboard-like AMCs structures, other physical mechanisms of RCS reduction are also discussed by far field distribution, near field distribution and the properties of mono-static RCS reduction.

关键词： artificial magnetic conductor (AMC) electromagnetic metasurfaces phase matching technology radar cross section (RCS)

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A design of hardware-in-the-loop real-time simulation for large-scale complex electromechanical system

A design of hardware-in-the-loop real-time simulation for la...

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CSAA/IET International Conference on Aircraft Utility Systems (AUS 2018)

作者： Zhentian Liu Guangsen Wang Chengmei Lin Zhiwei Wang Jing Li National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval Univ. of Engineering Wuhan China Wuhan Marine Machinery Co. Ltd Wuhan China

ISBN: (纸本)9781510872745

The more electric aircraft (MEA), belonging to the large-scale complex electromechanical system (LSCES), always has a large-scale complex structure, of which the design, testing, and evaluation may be a challenging task. In order to analyze the impact of various factors on the system performance and reduce the potential risk, it is advantageous to establish a hardware-in-the-loop (HIL) real-time simulation platform for MEA. From this purpose, some key processes are suggested to clear the way for an efficient and accurate design. First, the principles of system partitioning and high-performance communication network are presented for distributed parallel computation. Then, algorithms are discussed and compared aiming to compensate inter-simulation time-step switching error caused by high-frequency switches which are widely used in MEA. Finally, an automation test method based on Monte Carlo (MC) and Genetic Algorithm (GA) methodology is proposed. In the experimental part, a permanent magnet synchronous motor (PMSM) in HIL mode is presented to demonstrate the practicality, with the results of the offline and real-time simulation compared. In short, this paper provides a guidance for establishing an HIL platform for LSCES.

关键词： MEA Large-scale complex electromechanical system Real-time simulation Monte cario Genetic algorithm

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High-harmonic generation from an epsilon-near-zero material

arXiv

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arXiv 2019年

作者： Yang, Yuanmu Lu, Jian Manjavacas, Alejandro Luk, Ting S. Liu, Hanzhe Kelley, Kyle Maria, Jon-Paul Sinclair, Michael B. Ghimire, Shambhu Brener, Igal State Key Laboratory for Precision Measurement Technology and Instruments Department of Precision Instrument Tsinghua University Beijing100084 China Stanford PULSE Institute SLAC National Accelerator Laboratory Menlo ParkCA94025 United States Department of Physics and Astronomy University of New Mexico AlbuquerqueNM87131 United States Sandia National Laboratories AlbuquerqueNM87185 United States Center for Integrated Nanotechnologies Sandia National Laboratories AlbuquerqueNM87185 United States Department of Materials Science and Engineering North Carolina State University RaleighNC27695 United States

High-harmonic generation (HHG) from a compact, solid-state medium is highly desirable for applications such as coherent attosecond pulse generation and extreme ultra-violet (EUV) spectroscopy1, yet the typically weak conversion of pump light to HHG can largely hinder its applications. Here, we use a material operating in its epsilon-near-zero (ENZ) region2-11, where the real part of its permittivity vanishes, to greatly boost the efficiency of the HHG process at the microscopic level. In experiments, we report high-harmonic emission up to the 9th order directly from a low-loss, solid-state ENZ medium: indium-doped cadmium oxide, with an excitation intensity at the GW cm-2 level. Furthermore, the observed HHG signal exhibits a pronounced spectral red-shift as well as linewidth broadening, resulting from the photo-induced electron heating and the consequent time-dependent resonant frequency of the ENZ film. Our results provide a novel nanophotonic platform for strong field physics, reveal new degrees of freedom for spectral and temporal control of HHG, and open up possibilities of compact solid-state attosecond light sources. Copyright © 2019, The Authors. All rights reserved.

关键词： Harmonic analysis

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