Abstract:
—In this work, we propose a novel-shaped metamaterial
absorber (MMA) for terahertz (THz) applications. The proposed
MMA comprises of metallic layers separated by gallium arsenide
(GaAs) substrate demonstrating three absorption peaks at 1.71,
3.16 and 4.89 THz with absorptivity of 99.4, 99.6 and 90.5%,
respectively. The normalized impedance, constitutive
electromagnetic (EM) parameters, surface current and electric
field distributions are analyzed for better understanding of
absorption mechanism. The absorption with different incident and
polarization angles is also analyzed. The proposed absorber is
ultra-compact (0.058Ȝ) and ultra-thin (0.028Ȝ) at the lowest
frequency of operation, hence, can be utilized for potential
applications including sensing and imaging.
