Metasurface generated polarization insensitive Fano resonance for high-performance refractive index sensing

Huigang Liu, Lu Zheng, Pingzhun Ma, Ying Zhong, Bo Liu, Xianzhong Chen, Haitao Liu

Research output: Contribution to journalArticle

6 Citations (Scopus)
39 Downloads (Pure)

Abstract

A refractive index sensor can provide refractive index measurement and continuously monitor a dynamic process. Plasmonic nanostructure based sensors suffer from severe metal losses in the optical range, leading to the performance degradation. We design and numerically analyze a high-performance refractive index sensor based on the Fano resonance generated by a dielectric metasurface. The figure of merit (FOM) and the maximum quality factor (Q-factor) of the sensor are 721 and 5126, respectively. The maximum modulation depth can exceed 99% and the enhancement factor of the electric field amplitude can reach a high value of about 100. The uniqueness of the proposed sensor is polarization insensitivity. The transmittance spectra for various polarization states of the incident light can perfectly coincide, which is a rare phenomenon in Fano resonance based sensors and can facilitate experimental measurement.
Original languageEnglish
Pages (from-to)13252-13262
Number of pages11
JournalOptics Express
Volume27
Issue number9
Early online date25 Apr 2019
DOIs
Publication statusPublished - 29 Apr 2019

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