Abstract

In this study, we proposed a novel refractive index sensor structure, comprising a metal–insulator–metal (MIM) waveguide and a circular ring containing a disk-shaped cavity (CRDC). The finite element method was used to theoretically analyze the sensor characteristics. The simulation results showed that the disk-shaped cavity is the key to the asymmetric Fano resonance, and the radius of the CRDC has a significant influence on the performance of the sensor. A maximum sensitivity and figure of merit (FOM) of 2240 nm/RIU and 62.5, respectively, were realized. Additionally, the refractive index sensor exhibits the potential of aiding in temperature detection owing to its simple structure and high sensitivity of 1.186 nm/ºC.

© 2022 Optica Publishing Group

Tunable compact nanosensor based on Fano resonance in a plasmonic waveguide system

Xiaobin Ren, Kun Ren, and Yuanxue Cai
Appl. Opt. 56(31) H1-H9 (2017)

Double ring nanostructure with an internal cavity and a multiple Fano resonances system for refractive index sensing

Zhiquan Shao, Shubin Yan, Feng Wen, Xiushan Wu, and Ertian Hua
Appl. Opt. 60(22) 6623-6631 (2021)

Tunable plasmon refractive index sensor and slow light characteristics based on a stub coupled with an ellipse resonator and its derived structure

Yunping Qi, Haowen Chen, Shiyu Zhao, Yujiao Wen, and Xiangxian Wang
J. Opt. Soc. Am. B 39(11) 2957-2968 (2022)

Refractive index sensor based on multiple Fano resonances in a plasmonic MIM structure

Zhengfeng Li, Kunhua Wen, Li Chen, Liang Lei, Jinyun Zhou, Dongyue Zhou, Yihong Fang, and Bingye Wu
Appl. Opt. 58(18) 4878-4883 (2019)

Optical sensing based on multimode Fano resonances in metal-insulator-metal waveguide systems with X-shaped resonant cavities

Jina Li, Jianfeng Chen, Xing Liu, He Tian, Jinfang Wang, Jingang Cui, and Siti Rohimah
Appl. Opt. 60(18) 5312-5319 (2021)