Nanometer refractive index sensor based on water droplet cavity structure with rectangular short rod

Jin Wang; Jin Wang; Jin Wang; Shubin Yan; Shubin Yan; Feng Liu; Feng Liu; Feng Liu; Shuwen Chang; Shuwen Chang; Shuwen Chang; Yuhao Cao; Yuhao Cao; Yuhao Cao; Yang Cui; Yang Cui; Jilai Liu; Jilai Liu; Yi Zhang; Yi Zhang; Yifeng Ren

doi:10.3389/fphy.2024.1364998

Frontiers in Physics (Apr 2024)

Nanometer refractive index sensor based on water droplet cavity structure with rectangular short rod

Jin Wang,
Jin Wang,
Jin Wang,
Shubin Yan,
Shubin Yan,
Feng Liu,
Feng Liu,
Feng Liu,
Shuwen Chang,
Shuwen Chang,
Shuwen Chang,
Yuhao Cao,
Yuhao Cao,
Yuhao Cao,
Yang Cui,
Yang Cui,
Jilai Liu,
Jilai Liu,
Yi Zhang,
Yi Zhang,
Yifeng Ren

Affiliations

Jin Wang: School of Electrical and Control Engineering, North University of China, Taiyuan, China
Jin Wang: School of Electrical Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou, China
Jin Wang: Joint Laboratory of Intelligent Equipment and System for Water Conservancy and Hydropower Safety Monitoring of Zhejiang Province and Belarus, Hangzhou, China
Shubin Yan: School of Electrical Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou, China
Shubin Yan: Joint Laboratory of Intelligent Equipment and System for Water Conservancy and Hydropower Safety Monitoring of Zhejiang Province and Belarus, Hangzhou, China
Feng Liu: School of Electrical and Control Engineering, North University of China, Taiyuan, China
Feng Liu: School of Electrical Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou, China
Feng Liu: Joint Laboratory of Intelligent Equipment and System for Water Conservancy and Hydropower Safety Monitoring of Zhejiang Province and Belarus, Hangzhou, China
Shuwen Chang: School of Electrical and Control Engineering, North University of China, Taiyuan, China
Shuwen Chang: School of Electrical Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou, China
Shuwen Chang: Joint Laboratory of Intelligent Equipment and System for Water Conservancy and Hydropower Safety Monitoring of Zhejiang Province and Belarus, Hangzhou, China
Yuhao Cao: School of Electrical and Control Engineering, North University of China, Taiyuan, China
Yuhao Cao: School of Electrical Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou, China
Yuhao Cao: Joint Laboratory of Intelligent Equipment and System for Water Conservancy and Hydropower Safety Monitoring of Zhejiang Province and Belarus, Hangzhou, China
Yang Cui: School of Electrical Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou, China
Yang Cui: Joint Laboratory of Intelligent Equipment and System for Water Conservancy and Hydropower Safety Monitoring of Zhejiang Province and Belarus, Hangzhou, China
Jilai Liu: School of Electrical Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou, China
Jilai Liu: Joint Laboratory of Intelligent Equipment and System for Water Conservancy and Hydropower Safety Monitoring of Zhejiang Province and Belarus, Hangzhou, China
Yi Zhang: School of Electrical Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou, China
Yi Zhang: Joint Laboratory of Intelligent Equipment and System for Water Conservancy and Hydropower Safety Monitoring of Zhejiang Province and Belarus, Hangzhou, China
Yifeng Ren: School of Electrical and Control Engineering, North University of China, Taiyuan, China

DOI: https://doi.org/10.3389/fphy.2024.1364998
Journal volume & issue: Vol. 12

Abstract

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In this paper, a novel nano sensor structure is proposed, which consists of a metal-insulator-metal waveguide (MIM) with rectangular baffles and a water droplet cavity with rectangular stubs (WDCRS). The WDCRS structure optimizes the sensitivity of a single water droplet cavity and makes the transmission curve clearer and smoother. The transmission characteristics of WDCRS structure were simulated using finite element method (FEM). The transmission characteristics of the exported structure were analyzed in detail. In addition, the influence of structural geometric parameters on sensing performance was also studied, and it was found that the size of the water droplet cavity is a key factor in improving sensitivity. When applied to a refractive index sensor, the structure achieves a sensitivity of up to 2,300 nm/RIU with a corresponding figure of merit (FOM) of 60.5. These works provide some ideas for the design of high-performance nanostructures and multiple Fano resonance excitation structures.

Published in Frontiers in Physics

ISSN: 2296-424X (Online)
Publisher: Frontiers Media S.A.
Country of publisher: Switzerland
LCC subjects: Science: Physics
Website: https://www.frontiersin.org/journals/physics

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