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Volume 26 - ICOP & ICPET 2020
ICOP & ICPET _ INPC _ ICOFS 2020, 26 - ICOP & ICPET 2020: 1093-1096 |
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Madadi Z, Abedi K, Darvish G, Khatir M. Refractive Index Sensing by a Narrow-Band Perfect Absorber based on Plasmonic Resonances. ICOP & ICPET _ INPC _ ICOFS 2020; 26 :1093-1096
URL: http://opsi.ir/article-1-2197-en.html
URL: http://opsi.ir/article-1-2197-en.html
1- Department of Electrical and Computer Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran.
2- Shahid Beheshti University
2- Shahid Beheshti University
Abstract: (1306 Views)
In this paper, a plasmonic perfect absorber based on the metal-insulator-metal structure has been designed as a biosensor. Simulation results performed by the 3D FDTD numerical method show that the absorption spectrum of the proposed biosensor has a narrow-band resonance peak in the wavelength range of 580-640 nm. After the perpendicular incidence of a plane wave light within wavelength range mentioned, the resonance wavelength shifts from λ=600.1 nm to λ=614.8 nm when the analyte refractive index increases from n=1 to n=1.1. The sensor,s sensitivity (S), full width at half maximum (FWHM) and the figure of merit (FOM) were obtained 147 nm/RIU, 9.6 nm, and 15.3, respectively. The analysis of the electric field at certain cross-sections of the absorber shows that the plasmonic resonances are stimulated at the insulator-metal and analyte-metal interfaces, and by amplifying the field at these surfaces, the sensing process is possible in the very small wavelength range.
Keywords: Meta-Insulator-Metal, Narrow-band, Plasmonic Perfect Absorber, Refractive Index, Biosensor
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