Near-perfect quantitatively tunable Q factors of quasi-bound states in the continuum via material-based thermal-optic perturbations

Author:

Zeng Dongwen,Zong Shu,Liu GuiqiangORCID,Yuan Wen,Liu Xiaoshan,Chen Jing1ORCID,Tang Chaojun2,Liu ZhengqiORCID

Affiliation:

1. Nanjing University of Posts and Telecommunications

2. Zhejiang University of Technology

Abstract

We successfully achieved high-Q dual-band quasi-bound states in the continuum (BICs) by introducing geometrical perturbations and thermally induced material perturbations into silicon half-disk nanodimers. Importantly, it is found that the Q factor obtained from the thermally induced material perturbations fits better with the inverse quadratic function of the asymmetry relation than that of the geometrical-perturbations-based system. Notably, we demonstrated that changes occurring at the sub-K scale can enable the simultaneous realization of the full width at half maximum offset distance for quasi-BICs and a maximum contrast ratio exceeding 44 dB. Our research provides novel, to the best of our knowledge, insights for potential applications in nano-lasers, temperature sensors, and infrared imaging.

Funder

National Natural Science Foundation of China

Natural Science Foundation of Jiangxi Province

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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