Optics and Photonics Society of Iran

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In this paper, a plasmonic perfect absorber based on metal-insulator-metal nanostructure with a periodic array of specific apertures in its upper metal layer is proposed. The absorption spectrum of the structure is calculated using the three-dimensional finite difference time domain (3D FDTD) numerical method for the vertical incidence of the plane wave beam in the range of 850 nm to 1300 nm. According to the results, the proposed absorber is not sensitive to the polarization of light in vertical radiation, and in both transverse electric (TE) and transverse magnetic (TM) modes, it offers the same absorption spectrum, in which the two resonance peaks with high absorptions are observed. Simulation data have also shown that the absorption spectrum will remain almost constant with a deviation of the radiation angle from 0 to 20 °. The capability of the device as a sensor of the refractive index of analyte solutions has also been measured. Thus by pouring analytes into the apertures of the structure and increasing their refractive index, the displacement of both resonance peaks to higher wavelengths has been observed. The sensitivities of these two resonance peaks (Δλ / Δn) are obtained 103.82 nm /RIU and 189.58 nm/RIU, respectively.

Keywords: Plasmonic Perfect Absorber, Insensitive to incident angle, Insensitive to polarization, Metal-Insulator-Metal Nanostructure.

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