Abstract
Herein, a novel cavity design of racetrack integrated circular cavity established on metal-insulator-metal (MIM) waveguide is suggested for refractive index sensing application. Over the past few years, we have witnessed several unique cavity designs to improve the sensing performance of the plasmonic sensors created on the MIM waveguide. The optimized cavity design can provide the best sensing performance. In this work, we have numerically analyzed the device design by utilizing the finite element method (FEM). The small variations in the geometric parameter of the device can bring a significant shift in the sensitivity and the figure of merit (FOM) of the device. The best sensitivity and FOM of the anticipated device are 1400 nm/RIU and ~12.01, respectively. We believe that the sensor design analyzed in this work can be utilized in the on-chip detection of biochemical analytes.
Highlights
Electronics 2021, 10, 1419. https://Surface plasmon polaritons are surface electromagnetic waves travelling on the metal-dielectric boundary formed by incident photons united with loose electrons [1,2]
The working principle of the ring resonator or in particular MIM WG plasmonic sensor is established on the wavelength interrogation method which involves the measurement of a shift in λres relating to the change in the RI of the ambient medium
A novel and highly sensitive design of a refractive index sensor based on a metal-insulator-metal (MIM) waveguide is proposed
Summary
Surface plasmon polaritons (hereafter represented as SPPs) are surface electromagnetic (hereafter represented as EM) waves travelling on the metal-dielectric boundary formed by incident photons united with loose electrons [1,2]. A high value of FOM is calculated using the expression ∆R/(R∆n) at a fixed wavelength, where ∆R denotes the reflection intensity variation due to ∆n of the surrounding medium and R is the reflection rate in the sensor structure. It can be calculated by utilizing ∆T/T∆n, where T denotes the transmittance in the proposed structures and ∆T/∆n is the transmission change at a fixed wavelength induced by a refractive index change.
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