Design of Graphene Based Ultra-Thin Broadband Thz Metasurface Absorber with Large Angular Inclination

This article introduces a graphene-based ultra-thin broadband THz absorber. The metasurface THz absorber comprises stacked layers of structured graphene and continuous graphene, silicon dioxide, and gold layer which have a high absorptivity of 99.9 % within the specific frequency range. The novel characteristic of the absorber is its ultrathin characteristics <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\mathbf{5. 1} \mu \mathrm{m}$</tex>), as well as compactness in periodicity (<tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$10.5 \mu ~\mathrm{m}$</tex>), which makes it extremely useful for electromagnetic shielding applications. The proposed absorber exhibits exceptional absorption efficiency, with an absorptivity over 90 % within the frequency range of 0.1 6.1 THz. The fractional bandwidth is approximately 193.54 %. The structure is implemented through comprehensive analysis of simulated results. This simulated structure also promises certain specific characteristics, it is polarization-insensitive and angularly stable as well. When the electromagnetic wave is incident, it shows good absorptivity up to 60° of for both the polarizations TM and TE. The suggested THz absorber finds potential applications in electromagnetic shielding, wireless communication systems, and stealth technology.