Quantitatively analyzing intrinsic plasmonic chirality by tracking the interplay of electric and magnetic dipole modes

TL;DR

This paper introduces a quantitative model for intrinsic plasmonic chirality based on the interplay of electric and magnetic dipole modes, providing a universal explanation that extends to small chiral objects without phase delay.

Contribution

It presents a novel quantitative framework for understanding plasmonic chirality through electric-magnetic dipole interactions, surpassing previous phase-based explanations.

Findings

The model accurately describes intrinsic plasmonic chirality.

Applicable to small chiral objects in the quasi-static limit.

Provides a universal rule for plasmonic chirality analysis.

Abstract

Plasmonic chirality exhibits great potential for novel nanooptical devices due to the generation of a strong chiroptical response. Previous reports on plasmonic chirality explanations are mainly based on phase retardation and coupling. We propose a quantitative model similar to the chiral molecules for explaining the mechanism of the intrinsic plasmonic chirality quantitatively based on the interplay and mixing of electric and magnetic dipole modes, which forms a mixed electric and magnetic polarizability. The analysis method is also suitable for small chiral object down to quasi-static limit without phase delay and expected to be a universal rule.