A new phenomenon has been demonstrated recently dealing with radiative properties of microstructured surfaces. It has been shown that light can be resonantly transmitted by a film with a periodic array of holes due to the excitation of surface plasmons. In this paper, we report similar results in the infrared due to the excitation of surface phonon-polaritons. Another striking property of microstructured surfaces supporting surface phonon-polaritons is their ability to emit light in very narrow solid angles. In this paper, we show that it is also possible to design a surface that allows to emit light isotropically with a 100% emissivity. Experimental results are reported.
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