Jia Yali, Tian Zhaohua, Liu Qi, Mou Zhengyang, Mo Zihan, Tian Yu, Gong Qihuang, Gu Ying
State Key Laboratory for Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871, China.
Frontiers Science Center for Nano-optoelectronics & Collaborative Innovation Center of Quantum Matter & Beijing Academy of Quantum Information Sciences, Peking University, Beijing 100871, China.
Nano Lett. 2024 Oct 2;24(39):12277-12284. doi: 10.1021/acs.nanolett.4c03588. Epub 2024 Sep 19.
High emission rate, high collection efficiency, and immunity to defects are the requirements of implementing on-chip single photon sources. Here, we theoretically demonstrate that both cascade enhancement and high collection efficiency of emitted photons from a single emitter can be achieved simultaneously in a topological photonic crystal containing a resonant dielectric nanodisk. The nanodisk excited by a magnetic emitter can be regarded as a large equivalent magnetic dipole. The near-field overlapping between this equivalent magnetic dipole and edge state enables achieving a cascade enhancement of single-photon emission with a Purcell factor exceeding 4 × 10. These emitted photons are guided into edge states with a collection efficiency of more than 90%, which is also corresponding to quantum yield due to topological antiscattering and the absence of absorption. The proposed mechanism under topological protection has potential applications in on-chip light-matter interactions, quantum light sources, and nanolasers.
高发射率、高收集效率以及对缺陷的免疫性是实现片上单光子源的要求。在此，我们从理论上证明，在包含共振介电纳米盘的拓扑光子晶体中，可以同时实现单个发射器发射光子的级联增强和高收集效率。由磁发射器激发的纳米盘可被视为一个大的等效磁偶极子。这个等效磁偶极子与边缘态之间的近场重叠使得能够实现单光子发射的级联增强，珀塞尔因子超过4×10。这些发射的光子被引导到边缘态，收集效率超过90%，这也由于拓扑反散射和无吸收而对应于量子产率。所提出的拓扑保护机制在片上光与物质相互作用、量子光源和纳米激光器方面具有潜在应用。
