Investigation of Multiple High Quality-Factor Fano Resonances in Asymmetric Nanopillar Arrays for Optical Sensing

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-p...

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Bibliographic Details
Published in:Photonics 2024-01, Vol.11 (1), p.68
Main Authors: Chen, Huawei, Fan, Xinye, Fang, Wenjing, Cao, Shuangshuang, Sun, Qinghe, Wang, Dandan, Niu, Huijuan, Li, Chuanchuan, Wei, Xin, Bai, Chenglin, Kumar, Santosh
Format: Article
Language:English
Subjects:
all-dielectric
Asymmetry
Boundary conditions
Design
Electric dipoles
Electromagnetism
Fano resonance
Figure of merit
high Q-factor
Investigations
metasurface
Metasurfaces
Network switches
Nonlinear optics
Optical properties
Optics
Radiation
Resonance
Sensors
Silica
Silicon nitride
Simulation
Symmetry
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Summary: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.
ISSN:2304-6732
2304-6732
DOI:10.3390/photonics11010068