Graphene hyperlens for terahertz radiation

TL;DR

This paper introduces a tunable graphene hyperlens for terahertz imaging, demonstrating subwavelength resolution and analyzing its dispersion properties using a multilayered structure.

Contribution

It proposes a novel graphene-based hyperlens design for THz imaging and provides a method to analyze its effective medium properties.

Findings

Successfully demonstrated imaging of two point sources separated by λ₀/5

Showed tunability of hyperlens properties via chemical potential adjustment

Analyzed and retrieved the hyperbolic dispersion and effective permittivity tensor

Abstract

We propose a graphene hyperlens for the terahertz (THz) range. We employ and numerically examine a structured graphene-dielectric multilayered stack that is an analogue of a metallic wire medium. As an example of the graphene hyperlens in action we demonstrate an imaging of two point sources separated with distance $\lambda_{0}/5$. An advantage of such a hyperlens as compared to a metallic one is the tunability of its properties by changing the chemical potential of graphene. We also propose a method to retrieve the hyperbolic dispersion, check the effective medium approximation and retrieve the effective permittivity tensor.