Abstract
We show the existence of Fano resonances in the context of near-field radiative heat transfer, which enables the strong suppression and enhancement of the spectral heat flux at specific wavelengths. We make use of the plasmon-phonon coupling in a symmetric nanocavity composed of a polaritonic material coated with a metallic layer. Each side of the cavity is kept at different temperatures. The hybridization of the plasmonic and phononic modes sustained by the multilayer structure is determined by the matching of their polarization. This leads to the opening of a thermal band gap, where heat transfer in the coupled system is inhibited for all wave vectors and for wavelengths at which the individual constituents are thermally transmissive.
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