Wang Lei, Cai Wei, Bie Mengli, Zhang Xinzheng, Xu Jingjun
Opt Express. 2018 Oct 29;26(22):28963-28975. doi: 10.1364/OE.26.028963.
The Zak phase and topological plasmonic Tamm states in plasmonic crystals based on periodic metal-insulator-metal waveguides are systematically investigated. We reveal that robust topological interfacial states against structural defects exist when the Zak phase between two adjoining plasmonic lattices are different in a common band gap. A kind of efficient admittance-based transfer matrix method is proposed to calculate and optimize the configuration with inverse symmetry. The topologically protected states are favorable for the spatial confinement and enhancement of electromagnetic fields, which open a new avenue for topological photonic applications.
基于周期性金属-绝缘体-金属波导的等离子体晶体中的Zak相和拓扑等离子体Tamm态被系统地研究。我们揭示，当两个相邻等离子体晶格之间的Zak相在一个共同带隙中不同时，存在对结构缺陷具有鲁棒性的拓扑界面态。提出了一种基于有效导纳的转移矩阵方法来计算和优化具有反对称性的结构。拓扑保护态有利于电磁场的空间限制和增强，这为拓扑光子应用开辟了一条新途径。
