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

Micromachines

Xiaoyu Zhang¹  Lifang Shen¹  Jilai Liu¹  Yi Zhang¹  Shubin Yan¹  Yifeng Ren² 

[1] School of Electrical Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China;School of Electrical and Control Engineering, North University of China, Taiyuan 030051, China;

关键词: Fano resonance;    SPPs;    U-shaped ring resonator;    sensor;    metal-insulator-metal;   

DOI  :  10.3390/mi13050750

来源: DOAJ

【 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.

【 授权许可】

Unknown