Radiative cooling of nanoparticles close to a surface

TL;DR

This paper investigates how nanoparticles cool down via radiation when near a surface, revealing oscillating relaxation times depending on their distance, similar to Friedel oscillations in Fermi liquids.

Contribution

It introduces the concept of oscillating thermal relaxation times for nanoparticles near surfaces, extending understanding of radiative cooling dynamics in near-field and far-field zones.

Findings

Relaxation time oscillates with distance from the surface.

Oscillations are analogous to Friedel oscillations.

Behavior observed for both polar and metallic nanoparticles.

Abstract

We study the radiative cooling of polar and metallic nanoparticles immersed in a thermal bath close to a partially reflecting surface. The dynamics of relaxation is investigated at different distances from the surface, i.e., in the near-field and far-field zones. We demonstrate the existence of an oscillating behavior for the thermal relaxation time with respect to the separation distance from the surface, an analog of Friedel oscillations in Fermi liquids.