Visible Spectrum Circular Dichroism in Extrinsic Chirality Metamaterials

TL;DR

This paper introduces a novel planar extrinsic chirality metamaterial that exhibits significant circular dichroism in the visible spectrum, with analysis of incident angles and unit sizes explaining the physical mechanism behind the effect.

Contribution

The work presents a new ECM design demonstrating giant visible-spectrum CD, expanding applications and understanding of extrinsic chirality in optical metamaterials.

Findings

Giant circular dichroism observed in visible spectrum

Incident beam angle and unit size significantly affect CD spectrum

Asymmetrical current excitation explains the physical mechanism

Abstract

We present the new planar extrinsic chirality metamaterial (ECM) design that manifests giant circular dichroism (CD) in the visible spectrum range rather than usual near-infrared and terahertz range. Effects of incident beam angles and meta-molecules unit sizes on the CD spectrums were theoretically analyzed; Physical mechanism was illustrated in new figures of asymmetrical current excitation in neighboring unit cells.