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Topological corner state (TCS) and topological edge state (TES) have providednew approaches to control the propagation of light. The construction oftopological coupled cavity-waveguide system (TCCWS) based on TCS and TES isworth looking forward to, due to its research prospects in realizinghigh-performance micro-nano integrated photonic devices. In this Letter, TCCWSis proposed in two-dimensional (2D) photonic crystal (PC), which possessesstrong optical localization, high quality factor and excellent robustnesscompared with the conventional coupled cavity-waveguide system (CCCWS). Thiswork will provide the possibility to design high-performance logic gates,lasers, filters and other micro-nano integrated photonics devices and expandtheir applications.

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