Conjugated gammadion chiral metamaterial with uniaxial optical activity and negative refractive index

TL;DR

This paper presents a conjugated gammadion chiral metamaterial that exhibits significant optical activity, circular dichroism, and negative refractive index at GHz frequencies, with improved design features over previous planar structures.

Contribution

It introduces a novel chiral metamaterial design with smaller unit cells and enhanced chirality, demonstrating negative refractive index and optical activity both numerically and experimentally.

Findings

Demonstrates negative refractive index at GHz frequencies

Shows large optical activity and circular dichroism

Achieves smaller unit cell size and larger chirality than prior designs

Abstract

We demonstrate numerically and experimentally a conjugated gammadion chiral metamaterial that uniaxially exhibits huge optical activity and circular dichroism, and gives a negative refractive index. This chiral design provides smaller unit cell size and larger chirality compared with other published planar designs. Experiments are performed at GHz frequencies (around 6GHz) and in good agreement with the numerical simulations.