题目：Dual control of enhanced quasi-bound states in the continuum emission from resonant c-Si metasurfaces

作者：Zhenghe Zhang, Chaojie Xu, Chen Liu, Man Lang, Yuehao Zhang, Minghao Li, Wanli Lu, Zefeng Chen, Chinhua Wang, Shaojun Wang,* and Xiaofeng Li*

单位：

School of Optoelectronic Science and Engineering & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, China

Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province & Key Lab of Modern Optical Technologies of Education Ministry of China, Soochow University, Suzhou 215006, China

Institute of Functional Nano & Soft Materials (FUNSOM) and Jiangsu Key Laboratory for Carbon-Based Functional Materials Devices, Soochow University, Suzhou 215123, China

Department of Physics and Swiss Nanoscience Institute, University of Basel, 4056 Basel, Switzerland

School of Materials Science and Physics, China University of Mining and Technology, Xuzhou 221116, China

摘要：Optical bound states in the continuum (BICs) offer strong interactions with quantum emitters and have been extensively studied for manipulating spontaneous emission, lasing, and polariton Bose−Einstein condensation. However, the out-coupling efficiency of quasi-BIC emission, crucial for practical light-emitting devices, has received less attention. Here, we report an adaptable approach for enhancing quasi-BIC emission from a resonant monocrystalline silicon (c-Si) metasurface through lattice and multipolar engineering.We identify dual-BICs originating from electric quadrupoles (EQ) and out-of-plane magnetic dipoles, with EQ quasi-BICs exhibiting concentrated near-fields near the c-Si nanodisks. The enhanced fractional radiative local density of states of EQ quasi-BICs overlaps spatially with the emitters, promoting efficient out-coupling. Furthermore, coupling the EQ quasi-BICs with Rayleigh anomalies enhances directional emission intensity, and we observe inherent opposite topological charges in the multipolarly controlled dual- BICs. These findings provide valuable insights for developing efficient nanophotonic devices based on quasi-BICs.

影响因子：10.8

链接：https://doi.org/10.1021/acs.nanolett.3c02148