使用设计的表面等离子体激元结构探测拓扑保护
Probing topological protection using a designer surface plasmon structure
摘要：
受拓扑绝缘体中强手性边缘态的启发，拓扑光子态最近在一些光子系统中得到了证实，包括通信波长处的耦合片上环形谐振器阵列。然而，电子与光子的本质差异决定了时反不变光子系统中的拓扑保护并不具有与电子拓扑绝缘体相同的鲁棒性。在这里，在一个设计师的表面等离子体平台组成的可调金属亚波长结构，我们构建光子拓扑边缘状态和探测其对各种缺陷类的鲁棒性，包括一些常见的时间反演不变的光子缺陷，可以打破拓扑保护，但不存在于电子拓扑绝缘体。这也是第一个实验实现的异常Floquet拓扑边缘状态，其拓扑相位不能预测通常的陈数拓扑不变量。
英文摘要：
Topological photonic states, inspired by robust chiral edge states in topological insulators, have recently been demonstrated in a few photonic systems, including an array of coupled on-chip ring resonators at communication wavelengths. However, the intrinsic difference between electrons and photons determines that the topological protection in time-reversal-invariant photonic systems does not share the same robustness as its counterpart in electronic topological insulators. Here, in a designer surface plasmon platform consisting of tunable metallic sub-wavelength structures, we construct photonic topological edge states and probe their robustness against a variety of defect classes, including some common time-reversal-invariant photonic defects that can break the topological protection, but do not exist in electronic topological insulators. This is also the first experimental realization of anomalous Floquet topological edge states, whose topological phase cannot be predicted by the usual Chern number topological invariants.
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