Terahertz volume plasmon-polariton modulation in all-dielectric hyperbolic metamaterials

TL;DR

This paper investigates how doping and geometry influence terahertz plasmon-polariton modes in all-dielectric hyperbolic metamaterials made from doped III-V semiconductors, offering insights for tunable terahertz devices.

Contribution

It introduces a multi-physics multi-scale theoretical framework to analyze and optimize doping and geometrical effects in all-dielectric hyperbolic metamaterials for terahertz applications.

Findings

Doping significantly modulates high-k plasmon-polariton modes.

Geometrical parameters like thickness and grating affect mode behavior.

All-dielectric hyperbolic metamaterials enable tunable terahertz responses.

Abstract

The development of plasmonics and related applications in the terahertz range faces limitations due to the intrinsic high electron density of standard metals. All-dielectric systems are profitable alternatives, which allows for customized modulation of the optical response upon doping. Here we focus on plasmon-based hyperbolic metamaterials realized stacking doped III-V semiconductors that have been shown to be optically active in the terahertz spectral region. By using a multi-physics multi-scale theoretical approach, we unravel the role of doping and geometrical characteristics (e.g., thickness, composition, grating) in the modulation of high-k plasmon-polariton modes across the metamaterial.