谐振器
光子学
偶极子
极化(电化学)
光学
物理
电介质
四极
介电常数
激光器
材料科学
光电子学
原子物理学
量子力学
物理化学
化学
作者
Shilin Yu,Yusen Wang,Ziang Gao,Hao Li,Shaozhe Song,Jianguo Yu,Tonggang Zhao
出处
期刊:Optics Express
[The Optical Society]
日期:2022-01-18
卷期号:30 (3): 4084-4084
被引量:46
摘要
Ultra-high quality (Q) factor resonances derived from the bound states in the continuum (BICs) have drawn much attention in optics and photonics. Especially in meta-surfaces, they can enable ultrasensitive sensors, spectral filtering, and lasers because of their enhanced light-matter interactions and rare superiority of scalability. In this paper, we propose a permittivity-asymmetric all-dielectric meta-surface, comprising high-index cuboid tetramer clusters with symmetric structural parameters and configuring periodically on a glass substrate. Simulation results offer dual-band quasi-BICs with high Q values of 4447 and 11391, respectively. Multipolar decomposition in cartesian and electromagnetic distributions are engaged to analyze the physical mechanism of dual quasi-BIC modes, which reveals that they are both governed by magnetic quadrupole (MQ) and in-plane toroidal dipole (TD). The polarization-insensitive and scalable characteristics are also investigated. Additionally, we appraise the sensing performances of the proposed structure. As an example, our work supports an uncommon route to design dual-band polarization-insensitive TD quasi-BICs resonators and facilitates their applications in optic and photonics, such as low-threshold lasers and sensing.
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