Negative refractive index due to chirality

TL;DR

This paper demonstrates that chiral metamaterials based on bilayer cross wires can achieve negative refractive index with high optical activity and circular dichroism, offering a simpler and more efficient design for various frequencies.

Contribution

It introduces a novel, simpler chiral metamaterial design and a retrieval procedure for negative refractive index applicable to circularly polarized waves.

Findings

Achieved giant optical activity and circular dichroism.

Realized negative refractive index at various frequencies.

Developed an effective retrieval method for chiral materials.

Abstract

We demonstrate experimentally and numerically that metamaterials based on bilayer cross wires give giant optical activity, circular dichroism, and negative refractive index. The presented chiral design offers a much simpler geometry and more efficient way to realize negative refractive index at any frequency. We also developed a retrieval procedure for chiral materials which works successfully for circularly polarized waves.