Inhomogeneous inclusions enhanced negative absorption in the plasma‑dielectric nanostructure

Abstract

Lately, the negative absorption in plasma-dielectric nanostructures provided a fertile ground for the advancement of THz electronic appliances. Herein we present a plasma-dielectric nanostructure aiming to achieve enhanced negative absorption in the high frequency region resulting because of strong plasma-light interaction. The paper presents dispersion maps of surface plasmon polaritons propagating at the boundary of the nanostructured metamaterial. The plasma-dielectric nanostructure leads to the dispersion equation and resonance mode. It is worthwhile mentioning that the former can couple with the incident wave to create an enhanced resonance. Doing so, the dispersion of the surface waves along with the resonance are involved in the plasma-light interaction and increase the negative absorption. Doing so, the resonance coupling defnes the distribution of negative absorption, and the maximum is dominated by dispersion. Moreover, the dispersion relation describing propagation of surface waves at the interface of highly anisotropic metamaterial has been applied to the inhomogeneous metamaterial case. Also, based on the behaviour of the efective properties of the metamaterial it has been concluded that the structure under investigation belongs to the class of the hyperbolic metamaterials.