Ultracompact topological photonic switch based on valley-vortex-enhanced high-efficiency phase shift.

ABSTRACT: Topologically protected edge states based on valley photonic crystals (VPCs) have been widely studied, from theoretical verification to technical applications. However, research on integrated tuneable topological devices is still lacking. Here, we study the phase-shifting theory of topological edge modes based on a VPC structure. Benefiting from the phase vortex formed by the VPC structure, the optical path of the topological edge mode in the propagation direction is approximately two-fold that of the conventional optical mode in a strip waveguide. In experiments, we show a 1.57-fold improvement in π-phase tuning efficiency. By leveraging the high-efficiency phase-shifting properties and the sharp-turn features of the topological waveguide, we demonstrate an ultracompact 1 × 2 thermo-optic

SUBMITTER: Wang H 

PROVIDER: S-EPMC9551041 | biostudies-literature | 2022 Oct

REPOSITORIES: biostudies-literature