Refractive index sensor based on Fano resonance in a ring with a rectangular cavity structure

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

Results in Physics (Dec 2021)

Refractive index sensor based on Fano resonance in a ring with a rectangular cavity structure

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

Affiliations

Xiaoyu Zhang: School of Electrical and Control Engineering, North University of China, Taiyuan 030051, China; School of Electrical Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China; Zhejiang-Belarus Joint Laboratory of Intelligent Equipment and System for Water Conservancy and Hydropower Safety Monitoring, Hangzhou 310018, China
Shubin Yan: School of Electrical Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China; Zhejiang-Belarus Joint Laboratory of Intelligent Equipment and System for Water Conservancy and Hydropower Safety Monitoring, Hangzhou 310018, China; Corresponding author at: School of Electronical Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou 310058, China (S. Yan).
Tingsong Li: School of Electrical and Control Engineering, North University of China, Taiyuan 030051, China; School of Electrical Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China; Zhejiang-Belarus Joint Laboratory of Intelligent Equipment and System for Water Conservancy and Hydropower Safety Monitoring, Hangzhou 310018, China
Pengwei Liu: School of Electrical and Control Engineering, North University of China, Taiyuan 030051, China; School of Electrical Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China; Zhejiang-Belarus Joint Laboratory of Intelligent Equipment and System for Water Conservancy and Hydropower Safety Monitoring, Hangzhou 310018, China
Yi Zhang: School of Electrical Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China
Lifang Shen: School of Electrical Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China
Yifeng Ren: School of Electrical and Control Engineering, North University of China, Taiyuan 030051, China
Ertian Hua: School of Electrical Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China; Zhejiang-Belarus Joint Laboratory of Intelligent Equipment and System for Water Conservancy and Hydropower Safety Monitoring, Hangzhou 310018, China

Journal volume & issue: Vol. 31
p. 104997

Abstract

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This paper presents an innovative plasmonics-based refractive index sensor structure that consists of a circular ring containing a rectangular cavity (CRRC) and a metal–insulator–metal (MIM) waveguide with two rectangular stubs. The narrowband mode of the CRRC interacts with the broadband mode of the bus waveguide stub to generate sharp and asymmetric Fano resonance. The transmission characteristics were simulated using the finite element method. A maximum refractive-index sensor sensitivity of 2300 nm/RIU and figure of merit (FOM) of 57.5 were achieved. The proposed structure is simple yet highly sensitive and has the potential to be useful in detecting electrolyte concentration in blood. The results of this study provide a foundation for developing highly sensitive plasmonic sensors biomedical applications.

Published in Results in Physics

ISSN: 2211-3797 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Science: Physics
Website: http://www.journals.elsevier.com/results-in-physics/

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