AU - Madadi, Zahra AU - Abedi, Kambiz AU - Darvish, Ghafar AU - Khatir, Mehdi TI - Refractive Index Sensing by a Narrow-Band Perfect Absorber based on Plasmonic Resonances PT - JOURNAL ARTICLE TA - opsi JN - opsi VO - 26 VI - 0 IP - 0 4099 - http://opsi.ir/article-1-2197-en.html 4100 - http://opsi.ir/article-1-2197-en.pdf SO - opsi 0 ABĀ  - 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. CP - IRAN IN - LG - eng PB - opsi PG - 1093 PT - Research YR - 2020