Coupled cavity-waveguide system based on topological corner state and edge state

TL;DR

This paper proposes a 2D photonic crystal system leveraging topological corner and edge states to achieve highly localized, robust light propagation, enabling advanced micro-nano photonic devices.

Contribution

It introduces a topological coupled cavity-waveguide system based on TCS and TES, enhancing localization, quality factor, and robustness over conventional systems.

Findings

Strong optical localization achieved

High quality factor demonstrated

Enhanced robustness compared to traditional systems

Abstract

Topological corner state (TCS) and topological edge state (TES) have provided new approaches to control the propagation of light. The construction of topological coupled cavity-waveguide system (TCCWS) based on TCS and TES is worth looking forward to, due to its research prospects in realizing high-performance micro-nano integrated photonic devices. In this Letter, TCCWS is proposed in two-dimensional (2D) photonic crystal (PC), which possesses strong optical localization, high quality factor and excellent robustness compared with the conventional coupled cavity-waveguide system (CCCWS). This work will provide the possibility to design high-performance logic gates, lasers, filters and other micro-nano integrated photonics devices and expand their applications.