Abstract
Chiral edge modes in photonic topological insulators have aroused great interest for their robust light transport, immune to backscattering, localization and disorder. This characteristic makes it applicable to slow light waveguides, which can considerably enhance light-matter interaction but typically suffer from disorder-induced attenuation. Winding of the edge state dispersion around the Brillouin zone multiple times can greatly reduce the group velocity, thereby realizing broadband topological slow light. However, this approach usually requires complicated modifications of coupling cavities with multiple resonant frequencies, making it difficult for experimental realization. Here, we theoretically and experimentally realize broadband topological slow light via coupling the chiral edge modes with corner states supported by higher order topological insulators of the same structure, shedding light on intriguing applications in various photonic systems.
Keywords:topological slow light, chiral edge modes, corner states
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