Scattering analysis of nano-scale chiral structures in optical vortex using Method of Moments

TL;DR

This paper develops a 3D Method of Moments simulation to analyze how nano-scale chiral structures scatter light under optical vortex illumination, revealing the electromagnetic mechanisms behind circular and optical vortex dichroism.

Contribution

It introduces a comprehensive simulation approach for nano-scale chiral structures under optical vortex light, elucidating their dichroic responses.

Findings

Angular momentum of light induces dichroic response.

Numerical results quantify circular and vortex dichroism.

Chiral nano-ribbons exhibit significant scattering differences.

Abstract

This paper presents a full 3D Method of Moments (MoM) simulation for analysis of scattering from nano-scale chiral ribbon structures under optical vortex illumination to aim to investigate electromagnetic mechanism of circular dichroism (CD) and optical vortex dichroism (VD). Both twist and helical nano-ribbons are modeled as dispersive materials scatterer. CD and VD are evaluated quantitatively by differences in scattering power. Numerical results demonstrate that angular momentum of optical light induces dichroic response effectively.