Coherent thermal infrared emission by two-dimensional silicon carbide gratings

Christophe Arnold (1) , François Marquier (2) , Moises Garin (3) , Fabrice Pardo (1) , Stéphane Collin (1) , Nathalie Bardou (1) , Jean-Luc Pelouard (1) , Jean-Jacques Greffet (2)

1 LPN - Laboratoire de photonique et de nanostructures
2 Laboratoire Charles Fabry / Naphel
3 Centro de Tecnologías Físicas [Universitat Politècnica de València]

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.

Domaines: Optique [physics.optics]

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 (1998-2015), 2012, 86 (3), pp.035316. ⟨10.1103/PhysRevB.86.035316⟩. ⟨hal-00751541⟩