Design of Terahertz Absorber Based On T-Shaped Metamaterial

Abstract

Terahertz(THz) metamaterials would eventually lead to improvements in a number of technological and research domains. Terahertz metamaterial absorbers may successfully entrap electromagnetic waves based on the changing electromagnetic properties of artificially produced unit cells. The dual T-shaped metamaterial structure are made up of gold patches are proposed and analysed. The absorber has dielectric substrate between gold which is on top and bottom layers. The absorber is anlaysed using various dielectric substrates like Gallium arsenide(GaAs), Silicon Carbide (SiC) and Poly tetra fluoro ethylene (PTFE). Further absorption and bandwidth are calculated. The absorptance rate produced by various materials are are almost 100% with resonant frequency in terms of wavelength 6.2$\mu$m for SiC, 8.5$\mu$m for GaAs and 4$\mu$m for PTFE. The bandwidths of each substrate are 0.5$\mu$m for SiC, 0.7$\mu$m for GaAs, 0.8$\mu$m for PTFE. The three different dielectric substrates are compared and concluded PTFE as more efficient than the other materials.