Refractive Index Sensor Based on the Fano Resonance in Metal-Insulator-Metal Waveguides Coupled with a Whistle-Shaped Cavity

被引：10

作者：

Li, Bo ^{[1
,2
]}

Sun, Huarong ^{[2
]}

Zhang, Huinan ^{[2
]}

Li, Yuetang ^{[2
]}

Zang, Junbin ^{[2
]}

Cao, Xiyuan ^{[2
]}

Zhu, Xupeng ^{[3
]}

Zhao, Xiaolong ^{[4
]}

Zhang, Zhidong ^{[2
]}

机构：

[1] North Univ China, Sch Software, Taiyuan 030051, Peoples R China

[2] North Univ China, Key Lab Instrumentat Sci & Dynam Measurement, Minist Educ, Taiyuan 030051, Peoples R China

[3] Lingnan Normal Univ, Sch Phys Sci & Technol, Zhanjiang 524048, Peoples R China

[4] North Univ China, Sch Elect & Control Engn, Taiyuan 030051, Peoples R China

来源：

MICROMACHINES | 2022年 / 13卷 / 10期

基金：

中国国家自然科学基金;

关键词：

plasmonic; refractive index sensor; finite element method; Fano resonance; metal-insulator-mental; SENSITIVITY; PLASMONICS; FIGURE; MERIT;

D O I：

10.3390/mi13101592

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

A plasmonic refractive index sensor based on surface plasmon polaritons (SPPs) that consist of metal-insulator-metal (MIM) waveguides and a whistle-shaped cavity is proposed. The transmission properties were simulated numerically by using the finite element method. The Fano resonance phenomenon can be observed in their transmission spectra, which is due to the coupling of SPPs between the transmission along the clockwise and anticlockwise directions. The refractive index-sensing properties based on the Fano resonance were investigated by changing the refractive index of the insulator of the MIM waveguide. Modulation of the structural parameters on the Fano resonance and the optics transmission properties of the coupled structure of two MIM waveguides with a whistle-shaped cavity were designed and evaluated. The results of this study will help in the design of new photonic devices and micro-sensors with high sensitivity, and can serve as a guide for future application of this structure.

引用

页数：8

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