互易光子拓扑绝缘体介质中无反射单向边缘模的激发
Exciting Reflectionless Unidirectional Edge Modes in a Reciprocal Photonic Topological Insulator Medium
摘要：
光子拓扑绝缘体是一类有趣的材料，其光子能带结构可以在体中具有带隙，同时支持拓扑保护的单向边缘模式。最近对双各向异性超材料的研究[1-6]使用其电磁模拟来模拟电子量子自旋霍尔效应，这是具有相对简单和优雅设计的此类系统的示例。在本文中，我们提出了一个旋转磁偶极子天线，由两个垂直取向的线圈组成，可以有效地激发单向拓扑保护表面波的双各向异性超波导（BMW）结构最近实现的马，等。[1]，尽管事实上，宝马介质不打破时间反演不变性。除了实现高方向性之外，天线还可以连续调谐，以各种幅度比向两个相反方向激励无反射边缘模式。我们通过实验证明了它的性能，并与仿真结果进行比较。
英文摘要：
Photonic topological insulators are an interesting class of materials whose photonic band structure can have a bandgap in the bulk while supporting topologically protected unidirectional edge modes. Recent studies [1-6] on bianisotropic metamaterials that emulate the electronic quantum spin Hall effect using its electromagnetic analog are examples of such systems with relatively simple and elegant design. In this paper, we present a rotating magnetic dipole antenna, composed of two perpendicularly oriented coils, that can efficiently excite the unidirectional topologically protected surface waves in the bianisotropic metawaveguide (BMW) structure recently realized by Ma, et al. [1], despite the fact that the BMW medium does not break time-reversal invariance. In addition to achieving high directivity, the antenna can be tuned continuously to excite reflectionless edge modes to the two opposite directions with various amplitude ratios. We demonstrate its performance through experiment and compare to simulation results.
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