The nonreciprocal, defect-immune and backscatter suppression of topological waveguides will play an important role in future optical communication systems. For a long time, researchers have studied such waveguides through magneto-optical media. On one hand, for gyromagnetic media, they have a large magneto-optical effect, but also have large losses at high frequencies; on the other hand, for gyroelectric media, they have small losses at optical frequencies, but their magneto-optical effect is too small. In this paper, we study a magneto-optical photonic crystal (PC) based on a metamaterial design with gyroelectric media, ordinary media and metal. The PC not only can work at optical frequencies, but it also has a large magneto-optical effect. From the PC, we have found some unique properties of non-trivial topological edge states. Different from the ordinary topological edge states that result from the broken band gap from the band degeneration, the topological edge states in the...

中文翻译：

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二维光子晶体在光频率下拓扑边缘状态的演化和逆转

拓扑波导的不可逆，缺陷免疫和反向散射抑制将在未来的光通信系统中发挥重要作用。长期以来，研究人员已经通过磁光介质研究了此类波导。一方面，对于旋磁介质，它们具有较大的磁光效应，但在高频下也具有较大的损耗；另一方面，对于回旋电介质，它们在光频率上的损耗很小，但是其磁光效应却很小。在本文中，我们研究了一种基于超材料设计的磁光光子晶体（PC），该材料具有回旋电介质，普通介质和金属。PC不仅可以在光频率下工作，而且还具有很大的磁光效应。从PC中，我们发现了非平凡的拓扑边缘状态的一些独特属性。