Abstract
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.
Highlights
Near field heat transfer [1,2,3,4] between closely spaced isotropic media has been intensively studied since it has been predicted that the heat flux at nanoscale can exceed the far-field limit of the Planck’s blackbody theory by orders of magnitude [5, 6]
By combining stochastic electrodynamics and the MaxwellGarnett 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
Summary
Near field heat transfer [1,2,3,4] between closely spaced isotropic media has been intensively studied since it has been predicted that the heat flux at nanoscale can exceed the far-field limit of the Planck’s blackbody theory by orders of magnitude [5, 6]. When the photon’s wavelength in such a medium is large compared to the size of its representative unit cell, the latter behaves effectively like an anisotropic material and may be described by an effective permittivity tensor (and, when necessary, an effective permeability as well). This naturally points to the question of how anisotropy influences the near-field heat transfer.
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