Wave Steering by Relaying Interface States in a Valley-Hall-Derived Photonic Superlattice

Hongchen Chu, Ze Guo Chen*, Yun Lai*, Guancong Ma*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Topological notions in physics have become a powerful perspective that leads to the discoveries of interface states. In this work, we present a scheme to steer waves by leveraging the properties of valley interface states (VISs) in a valley photonic crystal (VPC). Due to the chiral characteristics, the VISs deterministically possess either positive or negative dispersion relation, which can cause an obliquely incident wave to undergo a lateral shift. By stacking multiple VPC interfaces, the VIS-induced lateral shifts can relay in the transmitted wave towards the far side of incidence. By selectively engaging one type of VISs, the resultant outgoing wave appears to have undergone negative refraction. While this refraction can be flipped to positive by selectively exciting the other type of VISs with positive dispersion. This finding is verified in microwave experiments. Our scheme opens application scenarios for topological systems in wave manipulations.

Original languageEnglish
Article number044006
JournalPhysical Review Applied
Volume16
Issue number4
DOIs
Publication statusPublished - Oct 2021

Scopus Subject Areas

  • Physics and Astronomy(all)

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