Near-field heat transfer between a nanoparticle and a rough surface

Details Near-field heat transfer between a nanoparticle and a rough surface Near-field heat transfer between a nanoparticle and a rough surface

2011-03-11

arxiv.org/abs/1103.2374v1

Phys. Rev. B 81, 245414 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

In this work we focus on the surface roughness correction to the near-field radiative heat transfer between a nanoparticle and a material with a rough surface utilizing a direct perturbation theory up to second order in the surface profile. We discuss the different distance regimes for the local density of states above the rough material and the heat flux analytically and numerically. We show that the heat transfer rate is larger than that corresponding to a flat surface at short distances. At larger distances it can become smaller due to surface polariton scattering by the rough surface. For distances much smaller than the correlation length of the surface profile, we show that the results converge to a proximity approximation, whereas in the opposite limit the rough surface can be replaced by an equivalent surface layer.

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