Broadband Negative Refraction with a Crossed Wire Mesh

TL;DR

This paper demonstrates that a nonconnected crossed wire mesh can achieve broadband negative refraction due to its hyperbolic isofrequency contours, offering a new approach without left-handed materials.

Contribution

It introduces a structured crossed wire mesh that enables negative refraction through nonlocal response and hyperbolic dispersion, differing from traditional left-handed material methods.

Findings

Achieves negative refraction over a wide frequency range

Relies on hyperbolic isofrequency contours

Utilizes nonlocal electromagnetic response

Abstract

It is demonstrated that a structured material formed by nonconnected crossed metallic wires may enable negative refraction over a wide frequency range. This phenomenon is a consequence of the anomalous dispersion characteristics of the material, particularly of the fact that the isofrequency contours are hyperbolic. These properties rely on the nonlocal response of the crossed wire mesh, and establish a different paradigm for obtaining negative refraction without left-handed materials.