Independently tunable dual resonant dip refractive index sensor based on metal—insulator—metal waveguide with Q-shaped resonant cavity

doi:10.1088/1674-1056/ac48fe

中国物理B ›› 2022, Vol. 31 ›› Issue (3): 34211-034211.doi: 10.1088/1674-1056/ac48fe

Independently tunable dual resonant dip refractive index sensor based on metal—insulator—metal waveguide with Q-shaped resonant cavity

Haowen Chen(陈颢文)¹, Yunping Qi(祁云平)^1,3,†, Jinghui Ding(丁京徽)¹, Yujiao Yuan(苑玉娇)¹, Zhenting Tian(田振廷)¹, and Xiangxian Wang(王向贤)²

1 College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China;
2 School of Science, Lanzhou University of Technology, Lanzhou 730050, China;
3 Engineering Research Center of Gansu Province for Intelligent Information Technology and Application, Northwest Normal University, Lanzhou 730070, China

收稿日期:2021-09-04 修回日期:2021-12-27 接受日期:2022-01-07 出版日期:2022-02-22 发布日期:2022-02-24
通讯作者: Yunping Qi E-mail:qiyunping@nwnu.edu.cn
基金资助:
This study is supported by the National Natural Science Foundation of China (Grant No. 61865008) and Northwest Normal University Young Teachers' Scientific Research Capability Upgrading Program (Grant No. NWNU-LKQN2020- 11).

Independently tunable dual resonant dip refractive index sensor based on metal—insulator—metal waveguide with Q-shaped resonant cavity

Haowen Chen(陈颢文)¹, Yunping Qi(祁云平)^1,3,†, Jinghui Ding(丁京徽)¹, Yujiao Yuan(苑玉娇)¹, Zhenting Tian(田振廷)¹, and Xiangxian Wang(王向贤)²

1 College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China;
2 School of Science, Lanzhou University of Technology, Lanzhou 730050, China;
3 Engineering Research Center of Gansu Province for Intelligent Information Technology and Application, Northwest Normal University, Lanzhou 730070, China

Received:2021-09-04 Revised:2021-12-27 Accepted:2022-01-07 Online:2022-02-22 Published:2022-02-24
Contact: Yunping Qi E-mail:qiyunping@nwnu.edu.cn
Supported by:
This study is supported by the National Natural Science Foundation of China (Grant No. 61865008) and Northwest Normal University Young Teachers' Scientific Research Capability Upgrading Program (Grant No. NWNU-LKQN2020- 11).

摘要/Abstract

摘要： A plasmonic resonator system consisting of a metal—insulator—metal waveguide and a Q-shaped resonant cavity is proposed in this paper. The transmission properties of surface plasmon polaritons in this structure are investigated by using the finite difference in time domain (FDTD) method, and the simulation results contain two resonant dips. The physical mechanism is studied by the multimode interference coupled mode theory (MICMT), and the theoretical results are in highly consistent with the simulation results. Furthermore, the parameters of the Q-shaped cavity can be controlled to adjust the two dips, respectively. The refractive index sensor proposed in this paper, with a sensitivity of 1578 nm/RIU and figure of merit (FOM) of 175, performs better than most of the similar structures. Therefore, the results of the study are instructive for the design and application of high sensitivity nanoscale refractive index sensors.

关键词: surface plasmon polaritons, refractive index sensors, metal—insulator—metal (MIM) waveguide, multi-mode interference coupling theory

Abstract: A plasmonic resonator system consisting of a metal—insulator—metal waveguide and a Q-shaped resonant cavity is proposed in this paper. The transmission properties of surface plasmon polaritons in this structure are investigated by using the finite difference in time domain (FDTD) method, and the simulation results contain two resonant dips. The physical mechanism is studied by the multimode interference coupled mode theory (MICMT), and the theoretical results are in highly consistent with the simulation results. Furthermore, the parameters of the Q-shaped cavity can be controlled to adjust the two dips, respectively. The refractive index sensor proposed in this paper, with a sensitivity of 1578 nm/RIU and figure of merit (FOM) of 175, performs better than most of the similar structures. Therefore, the results of the study are instructive for the design and application of high sensitivity nanoscale refractive index sensors.

Key words: surface plasmon polaritons, refractive index sensors, metal—insulator—metal (MIM) waveguide, multi-mode interference coupling theory

中图分类号: (Optical waveguides and couplers)

42.79.Gn

73.20.Mf (Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)) 73.40.Rw (Metal-insulator-metal structures)

Haowen Chen(陈颢文), Yunping Qi(祁云平), Jinghui Ding(丁京徽), Yujiao Yuan(苑玉娇), Zhenting Tian(田振廷), and Xiangxian Wang(王向贤). Independently tunable dual resonant dip refractive index sensor based on metal—insulator—metal waveguide with Q-shaped resonant cavity[J]. 中国物理B, 2022, 31(3): 34211-034211.

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Independently tunable dual resonant dip refractive index sensor based on metal—insulator—metal waveguide with Q-shaped resonant cavity

Independently tunable dual resonant dip refractive index sensor based on metal—insulator—metal waveguide with Q-shaped resonant cavity

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