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O: Fachverband Oberflächenphysik

O 54: Nano-optics of metallic and semiconducting nanostructures (experiments II)

O 54.14: Talk

Thursday, March 26, 2009, 18:15–18:30, SCH A216

Near-field radiative heat transfer between a sphere and a nano-structured surface — •Felix Rüting, Oliver Huth, and Svend-Age Biehs — Institut für Physik Carl von Ossietzky Universität Oldenburg

We study the near-field radiative heat transfer between a probe and a structured sample at nanometer distances. The probe is modeled as a nanosphere by means of a dipole model, while the surface of the sample is treated by a perturbative ansatz based on the Rayleigh hypothesis and the Ewald-Oseen theorem. We obtain characteristic signatures of the heat transfer between a sphere and a simple model geometry, computed numerically up to the second order in the profile. The validity of the approximations employed is ascertained. Furthermore, we show that signals measured with a near-field scanning thermal microscope (NSThM) operated in constant-distance mode are in good qualitative agreement with the theoretical results already to the first order in the surface profile, even though the theoretical model is subject to restrictions which are not obeyed in the experiment.