Design and analysis of 0.64 THz metamaterial absorber for sensing applications

Abstract

Abstract The proposed work is about the design and analysis of an RF absorber at 0.64 THz. The proposed absorber has 99.99% absorptance. The incident angle sensitivity of absorber is 00 to 600. It has wide bandwidth and excellent quality factor. The absorber has been simulated by multi physics software to obtain absorptance, S11, impedance (Z11), real and imaginary permittivity and permeability, current density (J), E-fields, quality factor, higher order modes and sensitivity. The structure of absorber consists of a plus shape surrounded by two gold (Au) metal rings. It is positioned on a layer of silicon dioxide (SiO2) and is stacked with silicon. The ground plane by another layer of gold metal. The absorber is excited with shorting pins to obtain dual mode resonance at 0.64 THz and 0.80 THz. The values of absorbance on these two frequencies are 99.99% and 99%. The mathematical formulations for impedance, phase velocity and group velocity have been derived. The equivalent circuit modeling for absorber has been developed.