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Investigation of Multiple High Quality-Factor Fano Resonances in Asymmetric Nanopillar Arrays for Optical Sensing
- Source :
- Photonics, Vol 11, Iss 1, p 68 (2024)
- Publication Year :
- 2024
- Publisher :
- MDPI AG, 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.
- Subjects :
- all-dielectric
high Q-factor
metasurface
Applied optics. Photonics
TA1501-1820
Subjects
Details
- Language :
- English
- ISSN :
- 23046732
- Volume :
- 11
- Issue :
- 1
- Database :
- Directory of Open Access Journals
- Journal :
- Photonics
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.86b4bcf9e0f64c57904ca60b87a84d20
- Document Type :
- article
- Full Text :
- https://doi.org/10.3390/photonics11010068