Coexisting valley and pseudo-spin topological edge states in photonic topological insulators made of distorted Kekulé lattices,Photonics Research

当前位置： X-MOL 学术 › Photonics Res. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Coexisting valley and pseudo-spin topological edge states in photonic topological insulators made of distorted Kekulé lattices
Photonics Research ( IF 7.6 ) Pub Date : 2022-03-25 , DOI: 10.1364/prj.453803
Guochao Wei ₁ , Zhenzhen Liu ₁ , Licheng Wang ₁ , Jianyuan Song , Jun-Jun Xiao ₁

Affiliation

Photonic topological insulators protected by the lattice spatial symmetry (e.g., inversion and rotation symmetry) mainly support single type edge state, interpreted by either valley or pseudo-spin. Here, we demonstrate theoretically, numerically, and experimentally that a type of judiciously designed two-dimensional Kekulé photonic crystal with time reversal symmetry can possess topological valley and pseudo-spin edge states in different frequency bands. Topologically robust transportation of both the valley and pseudo-spin edge states was confirmed by measuring the transmission of straight and z-shaped interface supported edge mode and comparing with bulk modes in the microwave frequency regime. In addition, we show that due to the distinct topological origins, valley and pseudo-spin edge states can be distinguished by examining their end-scattering into the free space. Our system provides an alternative way in manipulating electromagnetic waves with additional degree-of-freedom, which has potential applications for robust and high-capacity waveguiding and multi-mode dividing.

更新日期：2022-03-25

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南

全部期刊列表>>