Chiral metamaterials with negative refractive index based on four "U" split ring resonators

TL;DR

This paper presents a chiral metamaterial made of twisted U-shaped split ring resonators that exhibits giant optical activity, circular dichroism, and negative refractive index for circularly polarized waves, confirmed by experiments and simulations.

Contribution

It introduces a novel design of uniaxial chiral metamaterials with large chirality leading to negative refractive index, advancing the development of optical devices.

Findings

Achieved negative refractive index for circularly polarized waves

Demonstrated giant optical activity and circular dichroism

Experimental results agree with numerical simulations

Abstract

A uniaxial chiral metamaterial is constructed by double-layered four "U" split ring resonators mutually twisted by 90 degrees. It shows a giant optical activity and circular dichroism. The retrieval results reveal that a negative refractive index is realized for circularly polarized waves due to the large chirality. The experimental results are in good agreement with the numerical results.