2015/08/28 by Jingjing Liu, Liu, Jingjing, Urcan Guler +12
Engineering · Materials Science · Physics and Astronomy · #Metamaterials and Metasurfaces Applications #Plasmonic and Surface Plasmon Research #Thermal Radiation and Cooling Technologies #physics.optics
paper · pdf · doi:10.48550/arxiv.1508.07335
10 pages, 5 figures
arxiv created 2015/08/28 · arxiv updated 2015/09/01
The thermal emission of refractory plasmonic metamaterial - a titanium nitride 1D grating - is studied at high operating temperature (540 °C). By choosing a refractory material, we fabricate thermal gratings with high brightness that are emitting mid-infrared radiation centered around 3 μm. We demonstrate experimentally that the thermal excitation of plasmon-polariton on the surface of the grating produces a well-collimated beam with a spatial coherence length of 32λ (angular divergence of 1.8°) which is quasi-monochromatic with a full width at half maximum of 70 nm. These experimental results show good agreement with a numerical model based on a two-dimensional full-wave analysis in frequency domain.