Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 36: Poster Session II (Organic films and electronics, photoorganics; Nanostructures; Plasmonics and nanooptics, Surface chemical reactions and heterogeneous catalysis, Surface dynamics )
O 36.31: Poster
Dienstag, 12. März 2013, 18:15–21:45, Poster B2
Radiative heat transfer at the nanoscale between artificial structures — •Maria Tschikin1, Philippe Ben-Abdallah2, and Svend-Age Biehs1 — 1Carl von Ossietzky Universität, Institute of Physics, 26111 Oldenburg, Germany — 2Carl von Ossietzky Universität, Institute of Physics, 26111 Oldenburg, Germany
The radiative heat flux for separation distances smaller than the thermal wavelength λth = ℏ c / (kBT) can be much larger than the black body limit due to the contribution of evanescent modes. Here we show that the inclusion of losses and evanescent contributions (in particular surface mode contributions) in the definition of the thermal conductance for photonic crystals is of fundamental importance. On the other hand we show that for hyperbolic materials like nanowire materials the dominant heat flux channel is provided by a broad band of frustrated modes rather than by surfaces modes. Finally, such artificial materials can be described by means of the effective medium theory in the long wavelength limit. We study the validity of the effective description for near-field radiation by comparing the effective calculation with exact results for layered media.