Novel hyperbolic metamaterials based on multilayer graphene structures

TL;DR

This paper introduces a new class of tunable hyperbolic metamaterials at THz frequencies using multilayer graphene, enabling control over dispersion and enhancing emission properties for semiconductor applications.

Contribution

It presents a novel design of hyperbolic metamaterials based on multilayer graphene with tunable dispersion and enhanced emission effects, including magnetic field modulation.

Findings

Tunable transition from elliptic to hyperbolic dispersion with gate voltage.

Demonstration of giant Purcell effect for THz emission enhancement.

Enhanced tunability via external magnetic field leading to wave hybridization.

Abstract

We suggest a new class of hyperbolic metamaterials for THz frequencies based on multilayer graphene structures. We calculate the dielectric permittivity tensor of the effective nonlocal medium with a periodic stack of graphene layers and demonstrate that tuning from elliptic to hyperbolic dispersion can be achieved with an external gate voltage. We reveal that such graphene structures can demonstrate a giant Purcell effect that can be used for boosting the THz emission in semiconductor devices. Tunability of these structures can be enhanced further with an external magnetic field which leads to the unconventional hybridization of the TE and TM polarized waves.