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O: Fachverband Oberflächenphysik
O 86: Plasmonics and Nanooptics VI
O 86.6: Talk
Friday, March 15, 2013, 11:45–12:00, H36
Nanoscale heat transfer: hyperbolic modes versus surface modes — •Svend-Age Biehs1, Maria Tschikin1, and Philippe Ben-Abdallah2 — 1Carl von Ossietzky Universität, Institute for Physics, 26111 Oldenburg, Germany — 2Laboratoire Charles Fabry, Institut d’Optique, CNRS, Université Paris- Sud, France
The radiative heat flux at the nanoscale can be by orders of magnitude larger than that between two black bodies. Therefore, this effect is sometimes called super-Planckian thermal radiation. When considering polar materials like SiC, it was shown that at the nanoscale the dominant heat flux channel is due to surface phonon polaritons. Here, we show that for hyperbolic/indefinite materials one can also achieve very large heat fluxes without any surface modes. In this case, the dominant heat flux channel is due to frustrated total internal reflection modes. We show that this is a broad-band effect whereas the heat flux due to surface modes is a quasi-monochromatic effect which is preferable for applications in near-field thermophotovoltaics, for instance. Finally, we present exact calculations for multilayer structures and discuss the impact of hyperbolic modes and surface modes.