Thermal heat radiation, near-field energy density and near-field radiative heat transfer of coated materials

摘要

We investigate the thermal radiation and thermal near-field energy density ofa metal-coated semi-infinite body for different substrates. We show that thesurface polariton coupling within the metal coating leads to an enhancement ofthe TM-mode part of the thermal near-field energy density when a polarsubstrate is used. In this case the result obtained for a free standing metalfilm is retrieved. In contrast, in the case of a metal substrate there is noenhancement in the TM-mode part, as can also be explained within the frameworkof surface plasmon coupling within the coating. Finally, we discuss theinfluence of the enhanced thermal energy density on the near-field radiativeheat transfer between a simple semi-infinite and a coated semi-infinite bodyfor different material combinations.