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C. Henkel, K. Joulain, R. Carminati, and J. J. Greffet
Spatial coherence of thermal near fields
Opt. Commun. 186 (2000) 57-67


    We analyze the spatial coherence of the electromagnetic field emitted by a half-space at temperature T close to the interface. An asymptotic analysis allows to identify three different contributions to the cross-spectral density tensor in the near-field regime: thermally excited surface waves, skin-layer currents and small-scale polarization fluctuations. It is shown that the coherence length can be either much larger or much shorter than the wavelength depending on the dominant contribution.

[ physics/0008028 ]

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