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

Tingsong Li; Shubin Yan; Pengwei Liu; Xiaoyu Zhang; Yi Zhang; Lifang Shen; Yifeng Ren; Ertian Hua

doi:10.3390/mi12111384

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

Micromachines (Basel). 2021 Nov 11;12(11):1384. doi: 10.3390/mi12111384.

Authors

Tingsong Li^{1

2

3}, Shubin Yan^{2

3}, Pengwei Liu¹, Xiaoyu Zhang¹, Yi Zhang², Lifang Shen², Yifeng Ren¹, Ertian Hua^{2

3}

Affiliations

¹ School of Electrical and Control Engineering, North University of China, Taiyuan 030051, China.
² School of Electrical Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China.
³ Joint Laboratory of Intelligent Equipment and System for Water Conservancy and Hydropower Safety Monitoring of Zhejiang Province and Belarus, Hangzhou 310018, China.

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.

Keywords: Fano resonance; MIM; refractive index sensor; surface plasmon polaritons (SPPs); trace element concentration monitoring.

Abstract

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