Topological Refraction in Kagome Split-Ring Photonic Insulators.

Topological Refraction in Kagome Split-Ring Photonic Insulators.
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Kagome 开环光子绝缘体中的拓扑折射

DOI:
10.3390/nano12091493
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发表时间:
2022-04-28
期刊:
影响因子:
5.3
通讯作者:
Deng, Xiaohua
Deng, Xiaohua
中科院分区:
材料科学3区
文献类型:
--
作者:
Li, Huichang;Luo, Chen;Zhang, Tailin;Xu, Jianwei;Zhou, Xiang;Shen, Yun;Deng, Xiaohua

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提出了一种基于Kagome开口环的谷霍尔型光子绝缘体。理论分析和数值计算表明,对称性不仅可以通过整体旋转打破,而且可以通过分裂环的单独旋转打破,提供拓扑相变。此外,边缘态从界面折射到本底空间在曲折终止进行了探讨。结果表明,出射光束的正/负折射取决于谷的类型(K或),从该边缘状态被投射。这些结果为太赫兹波的传输提供了一种新的控制方法,并在定向准直、分束、负折射成像等方面具有潜在的应用价值。
A valley-Hall-like photonic insulator based on Kagome split-ring is proposed. Theoretical analysis and numerical calculations illustrate that symmetry can be broken not only by global rotation but also individual rotation of the split rings, providing topological phase transitions. Furthermore, refraction of the edge state from the interface into the background space at Zigzag termination is explored. It is shown that positive/negative refraction of the outgoing beam depends on the type of valley (K or ), from which the edge state is projected. These results provide a new way to manipulate terahertz wave propagation and facilitate the potential applications in directional collimation, beam splitting, negative refraction image, etc.
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