Topological defect states in valley photonic structures (Conference Presentation)

Yidong Chong; Baile Zhang

doi:10.1117/12.2554480

10 March 2020 Topological defect states in valley photonic structures (Conference Presentation)

Yidong Chong, Baile Zhang

Proceedings Volume 11283, Integrated Optics: Devices, Materials, and Technologies XXIV; 1128315 (2020) https://doi.org/10.1117/12.2554480
Event: SPIE OPTO, 2020, San Francisco, California, United States

Abstract

We present a theoretical and experimental study of topological modes running along string-like disclinations in two-dimensional electromagnetic lattices. Two-dimensional honeycomb lattices can host lattice defects of five- and seven-membered rings, which serve as the fixed termination points for string-like disclination. The strings act upon the Dirac cone states in a manner analogous to Dirac strings. When a band gap is opened by breaking sublattice symmetry, gap-spanning interface states appear along the strings, similar to topological kink states in valley Hall systems. But unlike the valley Hall case, the edges can have arbitrary orientations and terminate at fixed points in the bulk. The theoretical and numerical analysis is rigorously verified through microwave experiments.

Conference Presentation

Citation Download Citation

Yidong Chong and Baile Zhang "Topological defect states in valley photonic structures (Conference Presentation)", Proc. SPIE 11283, Integrated Optics: Devices, Materials, and Technologies XXIV, 1128315 (10 March 2020); https://doi.org/10.1117/12.2554480

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