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Coherent thermal infrared emission by two-dimensional silicon carbide gratings

Abstract : The thermal emission of cross-slit silicon carbide grating is studied in the Restrahlen region over all emission angles. We show experimentally that the thermal excitation of surface-phonon polaritons on the surface of 2D grating allows us to get a high emissivity in both polarizations, which is collimated in p polarization for a specific wavelength determined by the periodicity of the grating.We also show numerically that 2D gratings optimized to efficiently out-couple thermally excited surface-phonon polaritons of the flat part of the dispersion relation can have a high efficiency for all emission directions for both polarizations.
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Christophe Arnold, François Marquier, Moises Garin, Fabrice Pardo, Stéphane Collin, et al.. Coherent thermal infrared emission by two-dimensional silicon carbide gratings. Physical Review B: Condensed Matter and Materials Physics, American Physical Society, 2012, 86 (3), pp.035316. ⟨10.1103/PhysRevB.86.035316⟩. ⟨hal-00751541⟩

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