Nanoscale heat flux between nanoporous materials

Laboratoire Charles Fabry, Institut d’Optique, CNRS, Université Paris-Sud, Campus Polytechnique, RD 128, Palaiseau Cedex, France.
Optics Express (Impact Factor: 3.49). 09/2011; 19 Suppl 5(19):A1088-103. DOI: 10.1364/OE.19.0A1088
Source: PubMed


By combining stochastic electrodynamics and the Maxwell-Garnett description for effective media we study the radiative heat transfer between two nanoporous materials. We show that the heat flux can be significantly enhanced by air inclusions, which we explain by: (a) the presence of additional surface waves that give rise to supplementary channels for heat transfer throughout the gap, (b) an increase in the contribution given by the ordinary surface waves at resonance, (c) and the appearance of frustrated modes over a broad spectral range. We generalize the known expression for the nanoscale heat flux for anisotropic metamaterials.

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    • "Nanoscale heat transfer beyond the black body limit has led to considerable interest due to simultaneous development of theoretical tools utilizing Rytov's heat transfer theory and experimental validation based on near-field measurements [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13]. Surface waves play a key role in heat transfer which has been ascertained through bimetallic cantilever experiments [7] as well as near-field thermal emission spectroscopy [11,14]. "
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