Sensing characteristics of a plasmonic bragg microcavity

Abstract

We represent a detailed design of a plasmonic refractive index sensor based on a metal-insulator-metal Bragg microcavity in which two simultaneous mechanisms boost the sensing performance: high field confinement and resonant assisted multiple-pass of the plasmonic waves. We investigate in detail the effect of structural parameters on the plasmonic spectral properties such as depth of dip and spectral width since these parameters determine the sensor performance such as sensitivity, resolution, and signal-to-noise ratio and thus have a great significance in sensor ability. We explain the physical reasons for all of the observed behavior in the proposed sensing structure. © 2021 Optical Society of America