It has been predicted ten years ago that thermal emission by a surface can be quasimonochromatic and enhanced by orders of magnitude close to a surface. These effects are due to the thermal excitation of surface phonon polaritons. Although the observation of enhanced thermal fields close to a surface was reported in 2006, the observation of the predicted narrow spectrum has only be reported recently [1,2]. In this talk, we will report measurements performed at ESPCI in the group of Yannick de Wilde. We will also discuss how the deposition of a graphene layer modifies the near-field thermal radiation on a SiC surface. This effect paves the way to the electrical control of the local density of states in the near field.
 A Babuty et al. Phys.Rev.Lett. 110, 146103 (2013)
 R. Messina et al. , Phys.Rev.B 87, 085421 (2013)