基于太赫兹硅脊波导阵列的拓扑零模式研究

Research of Topological Zero Mode Based on Terahertz Silicon Ridge Waveguide Array

摘要: 近年来，一维波导阵列平台被广泛应用于研究新的拓扑相位与拓扑模式。基于Su-Schriffer-Heeger (SSH)模型，我们通过太赫兹(THz)硅脊波导阵列构建三种特殊结构，即长间距、等间距、短间距结构来激发拓扑零模与束缚模，研究拓扑零模式的传输特性。仿真结果表明，长间距与短间距结构激发的电场能量能够很好地束缚在波导中心界面，而并不是扩散到波导阵列的边界两边。并对三种结构的传输效率进行了分析，发现长间距结构激发的电场分布具有良好的局域性，很好地满足了拓扑零模式的传输特性。我们的研究为在THz波段实现具有鲁棒性的稳定传输提供研究基础与可行思路。

Abstract: In recent years, one-dimensional waveguide arrays have been widely used to study new topological phases and modes. Based on the Su-Schriffer-Heeger (SSH) model, we construct three special THz silicon ridge waveguide array structures, namely long-spaced, equidistant and short-spaced waveguide arrays (THz), to stimulate topological zero mode and bound mode, and study the transmission characteristics of topological zero mode. The simulation results show that the electric field energy stimulated by the long and short spacing structures can be well confined to the central interface of the waveguide, rather than spreading to both sides of the boundary of the waveguide array. The transmission efficiency of the three structures is analyzed, and it is found that the electric field distribution excited by the long-distance structure has good localization, which satisfies the transmission characteristics of the topological zero mode well. Our research provides research basis and feasible ideas for realizing robust and stable transmission in THz band.