ARTICLE:

• NEAR FIELD RADIATIVE HEAT TRANSFER BETWEEN A SPHERE AND A SURFACE  download article

P.-O. Chapuis
Laboratoire d'Energétique Moléculaire et Macroscopique, Combustion, CNRS UPR 288, Ecole Centrale Paris, Grande Voie des Vignes, F-92295 Châtenay-Malabry cedex, France

J.-J. Greffet
Laboratoire d'Energétique Moléculaire et Macroscopique, Combustion, CNRS UPR 288, Ecole Centrale Paris, Grande Voie des Vignes, F-92295 Châtenay-Malabry cedex, France

S. Volz
Laboratoire d'Energétique Moléculaire et Macroscopique, Combustion, CNRS UPR 288, Ecole Centrale Paris, Grande Voie des Vignes, F-92295 Châtenay-Malabry cedex, France

ABSTRACT

In this article we propose an experiment able to detect near field (NF) radiative heat transfer (RHT) for dielectric materials and also conductive ones. Although an important theoretical work has been done in the past, it has not been clearly shown that predicted radiative behaviors are verified in the NF. This is due to the difficulty to perform measurements for simple and well-characterized geometries. We propose a setup consisting in a microsphere attached to the tip of a scanning thermal microscope. This ensures local parallelism of the sphere to a planar substrate, which is a keypoint when comparing data to theory. The setup is placed in vacuum in order to remove heat transfer due to air. We calculate numerically the distance dependence of the heat flux between the cold microsphere body and the flat substrate. We discuss the possible sensitivity of the experimental setup.

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