Plasmon induced transparency in graphene based terahertz metamaterials

TL;DR

This paper investigates the plasmon induced transparency effect in graphene-based terahertz metamaterials, demonstrating its dependence on configuration and Fermi energy, with potential applications in ultra-thin terahertz devices.

Contribution

It introduces a theoretical and numerical analysis of PIT in graphene metamaterials, highlighting configuration effects and tunability via Fermi energy, which is novel compared to metal-based structures.

Findings

PIT effect depends on the relative positioning of resonators and graphene strip.

The PIT effect can be tuned by adjusting the Fermi energy of graphene.

No PIT effect occurs when resonators and strip are collinear, unlike in metal structures.

Abstract

Plasmon induced transparency (PIT) effect in a terahertz graphene metamaterial is numerically and theoretically analyzed. The proposed metamaterial comprises of a pair of graphene split ring resonators placed alternately on both sides of a graphene strip of nanometer scale. The PIT effect in the graphene metamaterial is studied for different vertical and horizontal configurations. Our results reveal that there is no PIT effect in the graphene metamaterial when the centers of both the split ring resonators and the graphene strip are collinear to each other. This is a noteworthy feature, as the PIT effect does not vanish for similar configuration in a metal-based metamaterial structure. We have further shown that the PIT effect can be tuned by varying the Fermi energy of graphene layer. A theoretical model using the three level plasmonic system is established in order to validate the numerical results. Our studies could be significant in designing graphene based frequency agile ultra-thin devices for terahertz applications.