Helical edge states of topological photonic crystals with line defects

Jiang Zhen; Gao Yongfeng; He Liu; Song He; Zhou Jun; Zhu Renjie

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Helical edge states of topological photonic crystals with line defects

机译：具有线缺陷的拓扑光子晶体的螺旋边缘状态

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Topologically protected edge states of honeycomb photonic crystals (PCs) have been extensively studied in recent years. Here we propose several optimized two-dimensional PC configurations with distinct line defects introduced by breaking the C-6 symmetry of each topological lattice along the interfaces between two different topologies. The spin-flipping nature of the defect modes of these PC configurations is measured, which is expected to offer a novel realization mechanism of quantum spin Hall effect. The line defects can be treated as unidirectional air waveguides due to the characteristic topological properties. We manipulate the coupling effect of two helical edge states with tunable waveguide widths. It shows that the air waveguide has possibility for practical applications because of its suppression of backward scattering and considerable transmission efficiency. (C) 2019 Optical Society of America

机译：近年来，蜂窝光子晶体（PCS）的拓扑保护边缘状态已被广泛研究。在这里，我们提出了几种优化的二维PC配置，通过沿着两个不同拓扑之间的接口打破每个拓扑格子的C-6对称性来提出的不同线缺陷。测量了这些PC配置的缺陷模式的旋转式性质，预计将提供量子旋转霍尔效应的新颖实现机制。由于特征性拓扑特性，线缺陷可以被视为单向空气波导。我们用可调谐波导宽度操纵两个螺旋边缘的耦合效果。它表明，由于其抑制了向后散射和相当大的传输效率，空气波导具有实际应用的可能性。（c）2019年光学学会

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来源
《Applied optics》 |2019年第9期|共6页
作者
Jiang Zhen; Gao Yongfeng; He Liu; Song He; Zhou Jun; Zhu Renjie;
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Jiangsu Univ Sch Mech Engn Zhenjiang 212013 Jiangsu Peoples R China;

Jiangsu Univ Sch Mech Engn Zhenjiang 212013 Jiangsu Peoples R China;

Jiangsu Univ Sch Mech Engn Zhenjiang 212013 Jiangsu Peoples R China;

Jiangsu Univ Sch Mech Engn Zhenjiang 212013 Jiangsu Peoples R China;

Ningbo Univ Fac Sci Inst Photon Ningbo 315211 Zhejiang Peoples R China;

Jiangsu Univ Sch Mech Engn Zhenjiang 212013 Jiangsu Peoples R China;

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正文语种 eng
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Helical edge states of topological photonic crystals with line defects

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