Left-handed Band in an Electromagnetic Metamaterial Inducedby Sub-wavelength Multiple Scattering

TL;DR

This paper demonstrates that multiple scattering at sub-wavelength scales in electromagnetic metamaterials can induce a left-handed band and negative refraction, confirmed through experiments showing superlensing effects.

Contribution

It reveals the role of multiple scattering in creating negative index bands in metamaterials, expanding understanding beyond quasi-static approximations.

Findings

Negative index of refraction achieved experimentally

Superlensing effect demonstrated in periodic metamaterials

Multiple scattering induces dipolar resonance at sub-wavelength scale

Abstract

Due to the deep sub-wavelength unit cell in metamaterials, the quasi-static approximation is usually employed to describe the propagation. By making pairs of resonators, we highlight that multiple scattering also occurs at this scale and results in the existence of a dipolar resonance, which leads to a negative index of refraction when we consider several resonators. We experimentally verify the possibility of obtaining a negative index of refraction in periodic metamaterials in two different ways, and eventually demonstrates a superlensing effect in both cases.