Dresden 2009 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

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

O 54.13: Vortrag

Donnerstag, 26. März 2009, 18:00–18:15, SCH A216

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

A near-field scanning thermal microscope has been developed at Oldenburg University. This instrument measures the heat transfer between the tip of a sensor and the surface of a sample with a different temperature at nanometer distances. Our objective is to describe this near-field heat transfer theoretically, and to compare the theory to the measured data. To this end, the foremost part of the sensor can be modelled as a small sphere. Then the heat transfer between the sphere and the sample is calculated within the framework of Rytov’s fluctuational electrodynamics. Actually, however, the shape of the senor’s tip deviates from a sphere, which requires more refined strategies for modelling the tip. An analytically tractable generalisation of the sphere model is obtained by considering general spheroids, which allows one to assess the influence of the tip’s shape on the magnitude of the heat transfer. In this talk we present first results of such calculations, together with comparisons to results given by the sphere model.