论文标题
拓扑光子状态和从光子拓扑结构出口的光的定向发射由二维蜂窝光子晶体组成，具有不同的点组对称性
Topological photonic states and directional emission of the light exiting from the photonic topological structure composed of two dimensional honeycomb photonic crystals with different point group symmetries
论文作者
论文摘要
在这项工作中，我们使用C_6对称点组研究了一个二维蜂窝光子晶体（2D HPC），该组众所周知，该组在Brillion区的k = 0处证明了双乳胶锥。然后，我们通过从单位单元中心的圆柱体半径修改对称性C_6的圆柱体的半径来设计两个变形的PC，并将其简化为C_3 \ U {psion}组，而新结构则表现出光子拓扑边缘状态。因此，沿着两个变形PC的界面观察到边缘状态的拓扑保护态，具有背部散射 - 免疫特征，而没有任何缺陷或包括腔或弯曲。此外，研究了包括各种缺陷的光子拓扑绝缘子（PTI）退出的方向表面模式。同样，我们通过耦合光子拓扑绝缘子（CPTI）探索光的传播和耦合。
In this work, we investigate a two dimensional honeycomb photonic crystal (2D HPC) with C_6 symmetry point group, which is known to demonstrate a double Dirac cone at k=0 of the Brillion zone. Then we design two deformed PCs from the original one, by modifying the radius of the cylinders from the unit cell center in which the symmetry C_6 is reduced to the C_3\u{psion} group and new structure exhibits the photonic topological edge states. Consequently, the topologically protected propagation of the edge states with back scattering-immune feature is observed along the interfaces of the two deformed PCs without any defects or including cavities or bend. Furthermore, the directional surface modes exit from the photonic topological insulators (PTIs) including various defects, is investigated. As well as, we explore the propagation and coupling of light through the coupled photonic topological insulators (CPTIs).
