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Gas sensor based on multiple Fano resonances in metal-insulator-metal waveguide resonator system

G. WAMG1, Q. SHI1, F. CHEN1,* , Y. YU1

Affiliation

  1. School of Physics and Optoelectronic Engineering, Yangtze University, Jingzhou, 434023, China

Abstract

A metal-insulator-metal (MIM) waveguide consisting of two stub resonators and a slot resonator is proposed, which can be used as gas sensor when the slot resonator is filled with poly-hexamethylene biguanide (PHMB) functional material. The primary principle is that the refractive index of the PHMB material is different when exposed to the with different concentrations. Finite difference-time domain (FDTD) simulation results show that the Fano resonance (FR) is originated from the coupling of the strong FP resonance and weak tooth cavity resonance, the Fano spectrum can be independently tuned by the geometrical parameters, it is also found that the FR 1, FR 3, FR4 can be tuned by the length of the stub resonator, and FR 2, FR5 are controlled by the length of the slot resonator. In addition, the FR positions (FR2 and FR5) are highly sensitive to the concentration of the . The sensitivity of the FR5 can be up to . The sensitivity of the proposed plasmonic structure is about 9 times higher than reported in other similar sensors, which have possible future potential applications in slow light devices, nanoscale filters, and sensors for the detection of toxic gases..

Keywords

Surface plasmon polariton, Metal-insulator-metal, Fano resonance, Gas sensor.

Submitted at: Oct. 8, 2021
Accepted at: Aug. 10, 2022

Citation

G. WAMG, Q. SHI, F. CHEN, Y. YU, Gas sensor based on multiple Fano resonances in metal-insulator-metal waveguide resonator system, Journal of Optoelectronics and Advanced Materials Vol. 24, Iss. 7-8, pp. 323-331 (2022)