Optimal interactions of light with magnetic and electric resonant particles

TL;DR

This paper investigates the fundamental limits of electromagnetic responses of sub-wavelength particles, providing analytic formulas that include size effects and radiative corrections, to predict optimal electric and magnetic behaviors of nanoparticles.

Contribution

It introduces analytic formulas for the limits of electromagnetic responses of nanoparticles, accounting for size and radiative effects, advancing understanding of optimal light-particle interactions.

Findings

Derived formulas for electromagnetic response limits

Quantitative predictions of near-field enhancements

Descriptions of ideal absorption and unitary limits

Abstract

This work studies the limits of far and near-field electromagnetic response of sub-wavelength scatterers, like the unitary limit and of lossless scatterers, and the ideal absorption limit of lossy particles. These limit behaviors are described in terms of analytic formulas that approximate finite size effects while rigorously including radiative corrections. This analysis predicts the electric and/or magnetic limit responses of both metallic and dielectric nanoparticles while quantitatively describing near-field enhancements.