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The miniaturization of electromagnetic devices is a long-term theme for the development of modern technologies to achieve higher flexibilities, better performances, and higher density integration. Surface plasmon polaritons (SPPs) provide a powerful solution for reducing the size of integrated electromagnetic device due to its deep subwavelength confinement. However, materials or structures that support SPPs inevitably have impurities or structural defects, which leads to the loss of the propagating mode. In order to avoid scattering from impurities or defects, topological structures are introduced to address issues of discontinuities and have been proved to be an effective solution. In this paper, we first review the recent efforts devoted to SPPs based optical devices and those of artificial surface plasmon in terahertz/microwave band, and then summarize several important topological systems of SPPs. Finally, we present our perspectives on the future developments of this field.
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Keywords:
- topological electromagnetics/
- surface plasmon/
- metamaterial
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图 2 二维晶体及其边界态[30] (a)石墨烯中圆孔三角点阵的示意图, 在外加磁场B作用下, 有限晶格支持拓扑保护的单向边缘等离子体; (b)在B≠ 0的石墨烯中的等离激元色散能带, 当孔径d≠ 0, 出现完全带隙; (c)不同磁感应强度下的边界态及其鲁棒性
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