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Collective resonances in a circular array of gyromagnetic rods

机译：圆形磁回旋棒的集体共振

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摘要

We present a rigorous theoretical investigation on the collective magnetic resonance of a circular array of subwavelength gyromagnetic rods. We derive the closed-form solutions to the eigenmodes within the framework of the dynamic dipole approximation using an eigenresponse theory. Owing to the lack of time-reversal symmetry and Lorentz reciprocity, the eigenpolarizability spectra exhibit significant nonreciprocal characteristics: only a single branch of rotating magnetic dipoles is supported, whereas another one corresponding to inversely rotating magnetic dipoles is totally suppressed. We found that the collective coupled magnetic dipole and coupled electric dipole (CED) modes of the circular arrays display remarkable distinction in both the resonant frequency and the radiative width in comparison with the isolated gyromagnetic rod. We further carry out full-wave numerical simulation to test the accuracy of the analytical results on the CED mode.
机译：我们目前对亚波长回旋磁棒圆形阵列的集体磁共振进行了严格的理论研究。我们使用特征响应理论，在动态偶极近似框架内得出本征模的闭式解。由于缺乏时间反转对称性和洛仑兹互易性，本征极化率谱显示出显着的不可逆特性：仅支持旋转磁偶极子的单个分支，而与反向旋转磁偶极子对应的另一个分支则被完全抑制。我们发现圆形阵列的集体耦合磁偶极子和耦合电偶极子（CED）模式与孤立的陀螺磁棒相比在共振频率和辐射宽度上都表现出显着差异。我们进一步进行全波数值模拟，以测试CED模式下分析结果的准确性。

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  • 来源
    《Physical review》 |2020年第4期|045425.1-045425.8|共8页
  • 作者

    Jin Wang; Kai Fung Lee; Hui Yuan Dong; Zheng-Gao Dong; S. F. Yu; Kin Hung Fung;

  • 作者单位

    School of Physics Southeast University Nanjing 211189 China Department of Applied Physics Hong Kong Polytechnic University Hong Kong China;

    Department of Applied Physics Hong Kong Polytechnic University Hong Kong China;

    School of Science Nanjing University of Posts and Telecommunications Nanjing 210003 China;

    School of Physics Southeast University Nanjing 211189 China;

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