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Numerical Study on a Bound State in the Continuum Assisted Plasmonic Refractive Index Sensor

Authors :
Shulin Tang
Chang Chang
Peiji Zhou
Yi Zou
Source :
Photonics, Vol 9, Iss 4, p 224 (2022)
Publication Year :
2022
Publisher :
MDPI AG, 2022.

Abstract

Plasmonic sensors have attracted intensive attention due to their high sensitivity. However, due to intrinsic metallic loss, plasmonic sensors usually have a large full width at half maximum (FWHM) that limits the wavelength resolution. In this paper, we numerically investigate and propose a dielectric grating-assisted plasmonic device, leveraging the bound states in the continuum (BIC) effect to suppress the FWHM of the resonance. We initiate quasi-SP-BIC modes at 1559 nm and 1905 nm wavelengths by slightly tilting the incident angle at 2° to break the symmetry, featuring a narrow linewidth of 1.8 nm and 0.18 nm at these two wavelengths, respectively. Refractive index sensing has also been investigated, showing high sensitivity of 938 nm/RIU and figure of merit (FOM) of 521/RIU at 1559 nm and even higher sensitivity of 1264 nm/RIU and FOM of 7022/RIU at 1905 nm.

Details

Language :
English
ISSN :
23046732
Volume :
9
Issue :
4
Database :
Directory of Open Access Journals
Journal :
Photonics
Publication Type :
Academic Journal
Accession number :
edsdoj.4c23b29565bf463eb594b364d74c9057
Document Type :
article
Full Text :
https://doi.org/10.3390/photonics9040224