Abstract

We investigate an all-metal and simple-fabrication grating with an ultranarrow band absorption spectrum in the telecom window range. The influences of structure parameters on the absorption characteristics are investigated. For the best design, the absorption efficiency reaches 94% under normal incidence, with the full width at half-maximum of only 0.17 nm. We demonstrate that this ultranarrow band absorption is the result of the dominant excitation of the Rayleigh anomaly mode. The corresponding figure of merit is calculated to be ${8530}\;{{\rm RIU}^{- 1}}$. The applied procedure has the potential to also be used in designing high-performance reflection-based sensors in other wavelength ranges.

© 2020 Optical Society of America

Mirror-backed dielectric metasurface sensor with ultrahigh figure of merit based on a super-narrow Rayleigh anomaly

Yonghang Wang, Lei Xiong, Ming Tian, and Guangyuan Li
Appl. Opt. 60(36) 11205-11210 (2021)

Subwavelength grating waveguide racetrack-based refractive index sensor with improved figure of merit

Yu Sun, Guohua Hu, and Yiping Cui
Appl. Opt. 59(33) 10613-10617 (2020)

Refractive index sensor based on a Tamm Fabry–Perot hybrid resonance

Debayan Das, Philippe Boyer, and Jérôme Salvi
Appl. Opt. 60(16) 4738-4745 (2021)

Self-referenced terahertz refractive index sensor based on a cavity resonance and Tamm plasmonic modes

M. Mehdi Keshavarz and Abbas Alighanbari
Appl. Opt. 59(14) 4517-4526 (2020)

Analysis of a highly sensitive flat fiber plasmonic refractive index sensor

Moutusi De and Vinod Kumar Singh
Appl. Opt. 59(2) 380-388 (2020)