论文标题
观察由真实空间拓扑晶格缺陷引起的受保护光子边缘状态
Observation of Protected Photonic Edge States Induced By Real-Space Topological Lattice Defects
论文作者
论文摘要
晶体晶格中的拓扑缺陷（TDS）是基本的晶格缺陷，由于其真实的空间拓扑，无法通过局部扰动来消除。我们表明，将TDS添加到山谷光子晶体中会产生一个晶格披露，其作用像域壁，并具有拓扑边缘状态。该披露用作连接一对相反拓扑电荷的TD的自由图波导。在晶格缺陷的真实空间拓扑与带拓扑的真实空间拓扑之间的相互作用提供了一种新的方案，以实现具有强大拓扑波导和谐振器的复杂排列的大型光子结构。
Topological defects (TDs) in crystal lattices are elementary lattice imperfections that cannot be removed by local perturbations, due to their real space topology. We show that adding TDs into a valley photonic crystal generates a lattice disclination that acts like a domain wall and hosts topological edge states. The disclination functions as a freeform waveguide connecting a pair of TDs of opposite topological charge. This interplay between the real-space topology of lattice defects and band topology provides a novel scheme to implement large-scale photonic structures with complex arrangements of robust topological waveguides and resonators.
