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Design and Analysis of Microstrip Multi-Channeled Filter Using Photonic Crystal Branchy Defect

Journal of Rare Earths 2006年第z1期24卷 136-139页

作者： li yunhui jiang haitao he li li hongqiang zhang yewen chen hong Pohl Institute of Solid State Physics Tongji University Shanghai 200092 China Pohl Institute of Solid State Physics Tongji University Shanghai 200092 China Pohl Institute of Solid State Physics Tongji University Shanghai 200092 China Pohl Institute of Solid State Physics Tongji University Shanghai 200092 China Pohl Institute of Solid State Physics Tongji University Shanghai 200092 China Pohl Institute of Solid State Physics Tongji University Shanghai 200092 China

A multi-channeled filter based on branchy defect in a microstrip photonic crystal was proposed. By introducing a branchy structure across the defect region, multiple defect modes will appear inside the photonic gap, leading to the multi-channeled filtering phenomenon. In comparison with the conventional multi-channeled filters, the proposed structure is more compact and tunable as far as the device volume and fabrication are concerned. The microwave experiment results are found in agreement with simulation results.

关键词： photonic crystals defect mode multi-channeled filter

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Level pinning of anti-PT-symmetric circuits for efficient wireless power transfer

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National Science Review 2024年第1期11卷 215-224页

作者： Zhiwei Guo Fengqing Yang Haiyan zhang Xian Wu Qiong Wu Kejia Zhu Jun jiang haitao jiang Yaping Yang yunhui li hong chen MOE Key Laboratory of Advanced Micro-Structured Materials School of Physics Sciences and Engineering Tongji University Department of Electrical Engineering Tongji University School of Automotive Studies Tongji University

Wireless power transfer(WPT) technology based on magnetic resonance(a basic physical phenomenon)can directly transfer energy from the source to the load without wires and other physical contacts, and has been successfully applied to implantable medical devices, electric vehicles, robotic arms and other ***, due to the frequency splitting of near-field coupling, the resonant WPT system has some unique limitations, such as poor transmission stability and low efficiency. here, we propose anti-resonance with level pinning for high-performance WPT. By introducing the anti-resonance mode into the basic WPT platform, we uncover the competition between dissipative coupling and coherent coupling to achieve novel level pinning, and construct an effective anti-parity-time(anti-PT)-symmetric non-hermitian system that is superior to previous PT-symmetric WPT schemes. On the one hand, the eigenvalue of the anti-PT-symmetric system at resonance frequency is always pure real in both strong and weak coupling regions, and can be used to overcome the transmission efficiency decrease caused by weak coupling, as brought about by, for example, a large size ratio of the transmitter to receiver, or a long transmission *** the other hand, due to the level pinning effect of the two kinds of coupling mechanisms, the working frequency of the system is guaranteed to be locked, so frequency tracking is not required when the position and size of the receiver change. Even if the system deviates from the matching condition, an efficient WPT can be realized, thereby demonstrating the robustness of the level pinning. The experimental results show that when the size ratio of the transmitter coil to the receiver coil is 4.29(which is in the weak coupling region), the transfer efficiency of the anti-PT-symmetric system is nearly 4.3(3.2) times higher than that of the PT-symmetric system when the matching conditions are satisfied(deviated). With the miniaturization and integration of d

关键词： non-hermitian system wireless power transfer anti-PT-symmetric circuits synthetic dimension metamaterials

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Anomalous broadband Floquet topological metasurface with pure site rings

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Advanced Photonics Nexus 2023年第1期2卷 53-60页

作者： Zhiwei Guo Xian Wu Yong Sun haitao jiang Ya-Qiong Ding yunhui li yewen zhang hong chen Tongji University Key Laboratory of Advanced Microstructure MaterialsSchool of Physics Science and EngineeringShanghaiChina University of Shanghai for Science and Technology Science CollegeShanghaiChina

Photonic and acoustic topological insulators exhibiting one-way transportation that is robust against defects and impurities are typically realized in coupled arrays of two-dimensional ring *** systems have produced a series of applications,including optical isolators,delay lines,and ***,the structures are complicated because an additional coupler ring between neighboring rings is needed to construct photonic pseudospin.A photonic anomalous Floquet topological insulator is proposed and experimentally demonstrated in the microwave *** improved design takes advantage of the efficient and backward coupling of negative-index *** results contribute to the understanding of topological structures in metamaterials and point toward a unique direction for constructing useful topological photonic devices.

关键词： topological edge states circuit-based metamaterials backward coupling topological photonics

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基于非厄密拓扑效应的无线传能与传感研究

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光学学报 2023年第16期43卷 152-174页

作者：郭志伟胡胜宇张海燕王宇倩董丽娟孙勇李云辉江海涛羊亚平陈鸿同济大学物理科学与工程学院先进微结构材料教育部重点实验室上海200092 山西大同大学物理与电子科学学院微结构电磁功能材料山西省重点实验室山西大同037009

近年来受拓扑绝缘体启发而兴起的拓扑光子学有力地促进了电磁波调控和新型波功能器件的研究。光子人工带隙材料因其丰富的物态调控机制和高度定制化的设计自由度成为了研究拓扑光子学和研制鲁棒性光子器件的重要平台。本文主要综述了周... 详细信息

近年来受拓扑绝缘体启发而兴起的拓扑光子学有力地促进了电磁波调控和新型波功能器件的研究。光子人工带隙材料因其丰富的物态调控机制和高度定制化的设计自由度成为了研究拓扑光子学和研制鲁棒性光子器件的重要平台。本文主要综述了周期性二聚化以及准周期性Harper光子拓扑链中光子与人工带隙材料的相互作用,揭示了非厄密物理、宇称-时间对称转变和拓扑相变对能带和带隙的作用规律,以及光场本征态的调控和传输机制。围绕实际的共振耦合技术,介绍了非厄密拓扑物理启发下的具有拓扑保护特性的高性能近场无线传能和传感方案,并对非厄密拓扑物理对于无线传能和传感的发展将起到的作用进行了展望。

关键词：光学器件非厄密物理光拓扑结构拓扑相变无线传能无线传感

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