Development and analysis of whispering gallery mode model for refractive index sensing

Abstract

A refractive index sensor based on a whispering gallery mode resonator is numerically investigated in this paper. Whispering gallery mode resonators confine light and can be used in sensing applications, and this work presents the model built using COMSOL software to analyze their sensing performance. This work has investigated the WGM resonators’ response to refractive index changes numerically using 2D models in the refractive index ranges 1.000 and 1.333. The resonator showed a sensitivity of 167 nm/RIU in the refractive index range of 1.3331.4 and a sensitivity of 95 nm/RIU in the refractive index range of 1.000-1.010. The sensing resonator has potential applications for biological and chemical analytes.

Emerging metasurfaces for refractometric sensing: fundamental and applications

“…Its non-invasive nature significantly suppresses the possible contamination to target species, and is proven to be bio-compatible and environment friendly. Recently, various kinds of RI optical sensors have been developed and implemented, which can be divided into several categories depending on their underlying physical principles, such as non-resonant interferometer [8], whispering-gallery mode cavity [9], fiber grating based sensor [10], photonic crystal based sensors [11], quantum photonics based sensor [12] and metasurface based sensors [13]. Among them, the metasurfaces-based RI sensor offers a flexible and versatile platform for highly compact and integrated sensing, showing promising potential in fulfilling the increasing demand for various emerging applications including early diagnosis, point-of-care system, and single molecule detection, to name a few.…”