折射率
表面等离子共振
纳米光子学
功勋
耦合模理论
等离子体子
共振(粒子物理)
光学
栅栏
材料科学
表面等离子体子
导模共振
联轴节(管道)
光电子学
局域表面等离子体子
纳米线
电介质
诺共振
Q系数
作者
Haoran Chen,Hong-Fei wang,Kwok Wong,Dangyuan Lei
摘要
Nanophotonics based on localized surface plasmon resonance (LSPR) has emerged as a vibrant arena for research into enhanced light–matter interactions with potential applications in imaging, sensing, and computing. However, the low quality (Q) factor of LSPR is a significant barrier to comprehensive device applications. Here, we demonstrate that coupling the LSPR of a gold nanowire array with the optical bound states in the continuum (BIC) of a dielectric double-layer grating can significantly increase the Q factor of LSPR. We realize two hybrid modes with Q factors of up to 111 at 558 nm and 83 at 582 nm, which are about 14 and 10 times larger than those of an uncoupled gold nanowire array. Based on temporal coupled-mode theory, we further show that the resonance frequencies and Q factors of the hybrid modes can be modulated and optimized by varying relevant structural parameters. This coupled system provides a new platform for improving the figures of merit (FoMs) of LSPR-based refractive index sensors, and the concept of LSPR–BIC coupling can be extended to other similar nanosystems.
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