Prediction of resonant frequencies of a dual-wavelength plasmonic perfect absorber as a sensor by resistor–inductor–capacitor circuit models

Zahra Madadi; Kambiz Abedi; Ghafar Darvish; Mehdi Khatir

doi:10.1117/1.JNP.13.026010

31 May 2019 Prediction of resonant frequencies of a dual-wavelength plasmonic perfect absorber as a sensor by resistor–inductor–capacitor circuit models

Zahra Madadi, Kambiz Abedi, Ghafar Darvish, Mehdi Khatir

Author Affiliations +

Journal of Nanophotonics, Vol. 13, Issue 2, 026010 (May 2019). https://doi.org/10.1117/1.JNP.13.026010

Abstract

A plasmonic perfect absorber (PPA) based on a metal–insulator–metal–insulator–metal structure has been designed for refractive index sensing of glucose solutions (analyte). Then resistor–inductor–capacitor equivalent circuit models based on dimensions, the position of the components, and materials used in the structure have been developed to predict resonance frequencies of the absorber. Simulation results show that in the perpendicular incidence of a plane wave of light within 5 to 9 μm wavelengths, for the analyte placed over sensor surface with a refractive index of n = 1.312; the output absorption spectrum of the device has two resonance peaks, respectively, on λ₁ = 6441.01 nm and λ₂ = 7909.74 nm wavelengths. When the refractive index of analyte increases to n = 1.384, both resonant peaks are red shifted. Sensitivities (S = Δλ / Δn) of the first and second resonance peaks have been obtained as S₁ = 1287.083 nm / RIU and S₂ = 1142.5 nm / RIU, respectively.

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Zahra Madadi, Kambiz Abedi, Ghafar Darvish, and Mehdi Khatir "Prediction of resonant frequencies of a dual-wavelength plasmonic perfect absorber as a sensor by resistor–inductor–capacitor circuit models," Journal of Nanophotonics 13(2), 026010 (31 May 2019). https://doi.org/10.1117/1.JNP.13.026010

Received: 25 January 2019; Accepted: 30 April 2019; Published: 31 May 2019

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