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arXiv · 2106.13392

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

Xin Xie·Sai Yan·Jianchen Dang·Jingnan Yang·Shan Xiao·Yunuan Wang·Shushu Shi·Longlong Yang·Danjie Dai·Yu Yuan·Nan Luo·Ting Cui·Gaohong Chi·Zhanchun Zuo·Bei-Bei Li·Can Wang·Xiulai Xu
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Abstract

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

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Xin Xie, Sai Yan, Jianchen Dang, Jingnan Yang, Shan Xiao, Yunuan Wang, Shushu Shi, Longlong Yang, Danjie Dai, Yu Yuan, Nan Luo, Ting Cui, Gaohong Chi, Zhanchun Zuo, Bei-Bei Li, Can Wang, Xiulai Xu. 2021-06-25. Topological cavity based on slow light topological edge mode for broadband Purcell enhancement. https://doi.org/10.1103/physrevapplied.16.014036

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