A Nanoscale Structure Based on an MIM Waveguide Coupled with a Q Resonator for Monitoring Trace Element Concentration in the Human Body

Abstract

In this study, a nano-refractive index sensor is designed that consists of a metal–insulator–metal (MIM) waveguide with a stub-1 and an orthogon ring resonator (ORR) with a stub-2. The finite element method (FEM) was used to analyze the transmission characteristics of the system. We studied the cause and internal mechanism of Fano resonance, and optimized the transmission characteristics by changing various parameters of the structure. In our experimental data, the suitable sensitivity could reach 2260 nm/RIU with a figure of merit of 211.42. Furthermore, we studied the detection of the concentration of trace elements (such as Na+) of the structure in the human body, and its sensitivity reached 0.505 nm/mgdL−1. The structure may have other potential applications in sensors.

Simple and Improved Plasmonic Sensor Configuration Established on MIM Waveguide for Enhanced Sensing Performance

“…SPP waveguide formations, mainly MIM waveguides, have fascinated a lot of consideration due to their ability to overcome the diffraction limit of light, with the expectation of comprehending exceedingly integrated optical circuits due to their small footprint, ease of integration, and good balance between light localization and transmission loss [6,7]. Sensing is a hot topic among various fascinating applications, and several plasmonic sensor concepts established on MIM waveguides for refractive index (RI) and temperature sensing have been quantitatively explored and presented in recent years [8,9,10,11,6]. Moreover, several types of other plasmonic devices established on the MIM waveguide formation have also been proposed recently, including lters [12,13], power splitters [14,15], and light manipulation [16], among others.…”

Nanoscale Refractive Index Sensors Based on Fano Resonance Phenomena

“…When the ω value is small, the SPPs transmitted at the upper and lower metal-dielectric interfaces will be coupled, forming an even-symmetric and odd-symmetric dispersion model. In the odd-symmetric model, the SPPs have a short transmission distance and a high energy loss [21,22]. The transmission distance is long in the even-symmetric model, and the energy loss is low.…”