Complete terahertz absorber: coupled topological like structure, spaced graphene and magneto-optic effect

Abstract

The work examines terahertz (THz) broadband absorbers for unit topological structure (UTS) with spaced graphene. This study examined transmission and absorption of the proposed structure without and with graphene at each dielectric interface. The UTS absorbed more light while using a cascade structure with a structural index (n) and adjusting dielectric thicknesses (Δ). Absorption increased significantly with an external magnetic field (B). The objective for a complete THz absorber is achieved with average absorption, A=0.8093 by a modified structure with n=5, applying an external magnetic field, B=10.7 T, Fermi level, EF=-0.48 eV, and manipulating the thickness parameter Δ.