Graphene-Based Quad-Horn Metamaterial Absorber for THz Applications

In this article, a graphene-based quad-horn-shaped thin and broadband metamaterial absorber has been designed and critically analyzed at terahertz (THz) frequencies. The absorbing structure attains a broad absorption bandwidth of 2.5 THz within the frequency range of 1.7 to 4.2 THz with more than 90% absorptivity. It is found to possess two absorption peaks at 2.0 and 3.4 THz with 98.8% and 96% absorptivity, respectively. Besides, the consequence of varying the graphene's chemical potential the change in absorptivity response of the structure is also studied. Further, the structure is also analysed with the variation in angular stability and polarization insensitivity. The distribution of electric field and surface current density plots are utilized to be aware of the absorption losses in the designed structure. The results suggested the potentiality of the absorber be applied in various practical applications at THz frequencies.