Author(s): Chen, HW (Chen, Huawei); Fan, XY (Fan, Xinye); Fang, WJ (Fang, Wenjing); Cao, SS (Cao, Shuangshuang); Sun, QH (Sun, Qinghe); Wang, DD (Wang, Dandan); Niu, HJ (Niu, Huijuan); Li, CC (Li, Chuanchuan); Wei, X (Wei, Xin); Bai, CL (Bai, Chenglin); Kumar, S (Kumar, Santosh)

Source: PHOTONICS Volume: 11 Issue: 1  Article Number: 68  DOI: 10.3390/photonics11010068  Published: JAN 2024 

Abstract: A novel asymmetric all-dielectric metasurface supporting multiple Fano resonances with high quality-factor through the excitation of quasi-bound states in the continuum is theoretically investigated. It is demonstrated that two resonances in the near-infrared wavelength are excited by the symmetry-protected bound state in the continuum, which can be transformed into the electric dipole and the toroidal dipole quasi-BIC resonance with high quality-factor by breaking the symmetry of metasurface. Moreover, the sensing properties based on different liquid refractive indexes are researched theoretically. The results show that the maximum quality-factor of the Fano resonance peak is 8422, and the sensitivity can reach 402 nm/RIU, with a maximum figure of merit of 2400 RIU-1. This research is believed to further promote the development of optical sensing and nonlinear optics.

Accession Number: WOS:001151359100001

Author Identifiers:

Author Web of Science ResearcherID     ORCID Number

Kumar, Santosh J-7408-2013        0000-0003-4149-0096

eISSN: 2304-6732