A Nanosensor Based on a Metal-Insulator-Metal Bus Waveguide with a Stub Coupled with a Racetrack Ring Resonator

Haoran Shi; Shubin Yan; Xiaoyu Yang; Xiushan Wu; Wenchang Wu; Ertian Hua

doi:10.3390/mi12050495

A Nanosensor Based on a Metal-Insulator-Metal Bus Waveguide with a Stub Coupled with a Racetrack Ring Resonator

Micromachines (Basel). 2021 Apr 27;12(5):495. doi: 10.3390/mi12050495.

Authors

Haoran Shi^{1

2

3}, Shubin Yan^{1

2

3}, Xiaoyu Yang^{1

2

3}, Xiushan Wu^{2

3}, Wenchang Wu^{3

4}, Ertian Hua^{2

3}

Affiliations

¹ School of Instrument and Electronics, North University of China, Taiyuan 030051, China.
² School of Electronical Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou 310058, China.
³ Zhejiang-Belarus Joint Laboratory of Intelligent Equipment and System for Water Con-Servancy and Hydropower Safety Monitoring, Hangzhou 310018, China.
⁴ School of Electron and Information Engineering, Ningbo University of Technology, Ningbo 310058, China.

Abstract

A nanostructure comprising the metal-insulator-metal (MIM) bus waveguide with a stub coupled with a racetrack ring resonator is designed. The spectral characteristics of the proposed structure are analyzed via the finite element method (FEM). The results show that there is a sharp Fano resonance profile and electromagnetically induced transparency (EIT)-like effect, which are excited by a coupling between the MIM bus waveguide with a stub and the racetrack ring resonator. The normalized H_Z field is affected by the displacement of the ring from the stub x greatly. The influence of the geometric parameters of the sensor design on the sensing performance is discussed. The sensitivity of the proposed structure can reach 1774 nm/RIU with a figure of merit of 61. The proposed structure has potential in nanophotonic sensing applications.

Keywords: EIT-like; Fano resonance; MIM; nanosensor; racetrack ring resonator.

Abstract

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