Refractive Index Sensor Based on a Metal-Insulator-Metal Bus Waveguide Coupled with a U-Shaped Ring Resonator

被引：10
作者：
Zhang, Xiaoyu [1 ,2 ,3 ]
Yan, Shubin [1 ,2 ]
Liu, Jilai [1 ]
Ren, Yifeng [3 ]
Zhang, Yi [1 ,2 ]
Shen, Lifang [1 ,2 ]
机构：
[1] Zhejiang Univ Water Resources & Elect Power, Sch Elect Engn, Hangzhou 310018, Peoples R China
[2] Joint Lab Intelligent Equipment & Syst Water Cons, Hangzhou 310018, Peoples R China
[3] North Univ China, Sch Elect & Control Engn, Taiyuan 030051, Peoples R China
来源：
MICROMACHINES | 2022年 / 13卷 / 05期
基金：
中国国家自然科学基金;
关键词：
Fano resonance; SPPs; U-shaped ring resonator; sensor; metal-insulator-metal; FANO RESONANCE; ABSORBER;
D O I：
10.3390/mi13050750
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
In this study, a novel refractive index sensor structure was designed consisting of a metal-insulator-metal (MIM) waveguide with two rectangular baffles and a U-Shaped Ring Resonator (USRR). The finite element method was used to theoretically investigate the sensor's transmission characteristics. The simulation results show that Fano resonance is a sharp asymmetric resonance generated by the interaction between the discrete narrow-band mode and the successive wide-band mode. Next, the formation of broadband and narrowband is further studied, and finally the key factors affecting the performance of the sensor are obtained. The best sensitivity of this refractive-index sensor is 2020 nm/RIU and the figure of merit (FOM) is 53.16. The presented sensor has the potential to be useful in nanophotonic sensing applications.
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页数：10
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