Construction of Chiral Metamaterial with a Helix Array

TL;DR

This paper presents a novel design of a three-dimensional chiral metamaterial using a metallic helix array, enabling negative refractive index for circularly polarized light through collinear electric and magnetic dipoles.

Contribution

It introduces a new approach to tune optical properties by assembling helices, advancing the design of chiral metamaterials with unique three-dimensional structures.

Findings

Achieved negative refractive index at resonance

Demonstrated collinear electric and magnetic dipoles

Provided a method to tune optical properties via helix assembly

Abstract

Here we report the designing of chiral metamaterial with metallic helix array. The effective electric and magnetic dipoles, which originate from the induced surface electric current upon illumination of incident light, are collinear at the resonant frequency. Consequently, for the circularly polarized incident light, negative refractive index is realized. Our design provides a unique approach to tune the optical properties by assembling helices, and demonstrates a different approach in exploring three- dimensional chiral metamaterial.