Designing miniaturized metamaterial absorber with tunable multiband characteristics for THz applications

Abstract

In this paper, a novel tunable metamaterial absorber having multiple bands is presented for solving sensing-related issues in THz applications. Initially, a zigzag shaped metamaterial absorber with multiband response is reported and then, a tunable absorber is proposed to cover a wide THz spectrum. The proposed tunable absorber has six 'V' shaped stubs with graphene at the edges to realize six absorption bands of 0.65, 1, 1.33, 1.45, 1.74 and 1.95 THz. The tuning of absorption bands is realized by varying the chemical potential of graphene by controlling the electrostatic gating and hence, provides tunable absorption characteristics in the optical regime. The absorber is designed with a polyimide substrate having a unit cell dimension of 0.14 9 0.14 ko, which is smaller when compared to similar literature. The simulation result shows a better absorption rate of [ 90% over most of the operating bands. The influence of material on the absorption peak is analysed by using different types of conductors and dielectric materials.

A Circular Split Ring Resonator Absorber with Graphene Material for Terahertz Communication Applications

“…In general, surface conductivity is utilized to express graphene's behavior. Kubo [16] claims that the surface conductivity of graphene material has intra and interbands, which are represented by the following formulae.…”

“…To achieve the optical performance, Yi [15] presented a metasurface absorber based on a square-square-circle graphene array. Ashvanth [16] provides another graphene-based adjustable metasurface absorber by altering the chemical potential, and the suggested tunable absorber comprises six 'V-shaped stubs with graphene material at the corners to generate six absorption bands. Xu [17], proposes a polarization-insensitive and incidence angle-insensitive nature with a complementary graphene material-based T-shaped structure for generating dual bands and three absorption bands by adjusting graphene chemical potential.…”

A Circular Split Ring Resonator Absorber with Graphene Material for Terahertz Communication Applications

“…To achieve the optical performance, Yi et al [15] presented a metasurface absorber based on a square-square-circle graphene array. Ashvanth et al [16] provided another graphene-based adjustable metasurface absorber by altering the chemical potential, and the suggested tunable absorber comprises six V-shaped stubs with graphene material at the corners to generate six absorption bands. Xu et al [17] proposed a polarization-insensitive and incidence angle-insensitive nature with a complementary graphene material-based T-shaped structure for generating dual bands and three absorption bands by adjusting graphene chemical potential.…”