Dipole model for far-field thermal emission of a nanoparticle above a planar substrate

TL;DR

This paper presents a generalized dipole model for predicting the thermal far-field emission of nanoparticles near substrates, accounting for multiple temperatures, particle sizes, and material combinations, enhancing understanding of near-field thermal radiation.

Contribution

It introduces a comprehensive dipole model that includes eddy currents and variable temperatures, extending previous models for nanoparticle thermal emission near substrates.

Findings

Temperature differences significantly affect emission.

Particle size influences emission intensity.

Material combinations alter emission patterns.

Abstract

We develop a dipole model describing the thermal far-field radiation of a nanoparticle in close vicinity to a substrate. By including in our description the contribution of eddy currents and the possibility to choose different temperatures for the nanoparticle, the substrate, and the background, we generalize the existing models. We discuss the impact of the different temperatures, particle size, emission angle, and the distance dependence for all four combinations of gold and SiC nanoparticles or substrates.