Topological Cavity Based on Slow-Light Topological Edge Mode for Broadband Purcell Enhancement
Abstract
Slow light in topological valley photonic crystal structures offers possibilities to enhance light-matter interaction. We report a topological cavity based on slow-light topological edge modes 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 a 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 a high quality factor in a wide spectral range. It has great benefit for the realization of high-efficiency quantum-dot-based single-photon sources and entangled-photon sources with less restriction on spectral match. Such a topological cavity could serve as a significant building block toward the development of photonic integrated circuits with embedded quantum emitters.
- Publication:
-
Physical Review Applied
- Pub Date:
- July 2021
- DOI:
- 10.1103/PhysRevApplied.16.014036
- arXiv:
- arXiv:2106.13392
- Bibcode:
- 2021PhRvP..16a4036X
- Keywords:
-
- Physics - Optics
- E-Print:
- 16 pages, 4 figures