太赫兹人工表面等离激元波导阵列中拓扑零模的激发

Excitation of Topological Zero Mode in Terahertz Spoof Surface Plasmon Waveguide Array

摘要: 一维拓扑波导阵列为探索新的拓扑相位和拓扑模式提供了一个良好的平台。基于Su-Schriffer-Heeger (SSH)模型，我们通过在太赫兹人工表面等离激元(SSPP)波导阵列中构造长–长缺陷结构和短–短缺陷结构来激发拓扑零模和束缚模。仿真结果表明，太赫兹SSPP能很好地束缚在波导中心界面，并表现出非扩散特性。零模出现在波导阵列对应的能带隙中，并且不同数量的波导对应不同数量的零模式。我们的研究为未来研究太赫兹拓扑器件提供了一条新的途径。

Abstract: One-dimensional topological waveguide array provides a good platform for exploring new topologi-cal phases and topological modes. Based on the Su-Schriffer-Heeger (SSH) model, we excited topo-logical zero mode and binding mode by constructing long-long defect structures and short-short defect structures in terahertz spoof surface plasmon polariton (SSPP) waveguide arrays. The simu-lation results show that the terahertz SSPP is well bound to the central interface of the waveguide and exhibits non-spreading feature. The zero modes appear in the energy band gap corresponding to the waveguide array, and different numbers of waveguides correspond to different numbers of zero modes. Our study provides a new avenue for future research on terahertz topology devices.