论文标题
基于负指数介质的异常浮雕拓扑绝缘子的实验证明
Experimental demonstration of an anomalous Floquet topological insulator based on negative-index media
论文作者
论文摘要
表现出具有牢固缺陷和杂质的单向运输的光子和声学拓扑绝缘子通常在二维环谐振器的耦合阵列中实现。这些系统生产了一系列应用，包括光学隔离器，延迟线和激光器。但是，这些结构很复杂，因为需要在相邻环之间构建光子伪旋转的附加耦合环。在这项工作中，提出了量子自旋效应的光子类似物，并在微波处理中的异常浮雕拓扑绝缘子中实验证明。这种改进的设计利用了负指数媒体的有效和向后耦合。结果有助于理解超材料中的拓扑结构，并指向构建有用的拓扑光子设备的新方向。
Photonic and acoustic topological insulators exhibiting one-way transportation that is robust against defects and impurities are typically realized in coupled arrays of two-dimensional ring resonators. These systems have produced a series of applications, including optical isolators, delay lines, and lasers. However, the structures are complicated because an additional coupler ring between neighboring rings is needed to construct photonic pseudo-spin. In this work, a photonic analogue of the quantum spin Hall effect is proposed and experimentally demonstrated in an anomalous Floquet topological insulator in the microwave regime. This improved design takes advantage of the efficient and backward coupling of negative-index media. The results contribute to the understanding of topological structures in metamaterials and point toward a new direction for constructing useful topological photonic devices.
