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Slow light in topological valley photonic crystal structures offers newpossibilities to enhance light-matter interaction. We report a topologicalcavity based on slow light topological edge mode for broadband Purcellenhancement. The topological edge modes with large group indices over 100 canbe realized with a bearded interface between two topologically distinct valleyphotonic crystals, featuring the greatly enhanced Purcell factor because of theincreased local density of states. In the slow light regime, the topologicalcavity supports much more cavity modes with higher quality factor than that inthe fast light regime, which is both demonstrated theoretically andexperimentally. We demonstrate the cavity enables the broadband Purcellenhancement together with substantial Purcell factor, benefiting from densecavity modes with high quality factor in a wide spectral range. It has greatbenefit to the realization of high-efficiency quantum-dot-based single-photonsources and entangled-photon sources with less restriction on spectral match.Such topological cavity could serve as a significant building block toward thedevelopment of photonic integrated circuits with embedded quantum emitters.

Topological cavity based on slow light topological edge mode for broadband Purcell enhancement