Topological Refraction in Kagome Split-Ring Photonic Insulators.
Topological Refraction in Kagome Split-Ring Photonic Insulators.
复制标题
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
中科院分区:
文献类型:
--
作者:
Li, Huichang;Luo, Chen;Zhang, Tailin;Xu, Jianwei;Zhou, Xiang;Shen, Yun;Deng, Xiaohua
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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