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Electromagnetic field correlations near a surface with a nonlocal optical response

Abstract : The coherence length of the thermal electromagnetic field near a planar surface has a minimum value related to the nonlocal dielectric response of the material. We perform two model calculations of the electric energy density and the field's degree of spatical coherence? Above a polar crystal, the lattice constant gives the minimum coherence length. it also gives the upper limit to the near field energy density, cutting off its 1/z3 divergence. Near an electron plasma described by the semi-classical Lindhard dielectric function, the corresponding length scale is fixed by plasma screening to the Thomas-Fermi length. The electron mean free path, however, sets a larger scale where significant deviations from the local description are visible.
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https://hal.archives-ouvertes.fr/hal-00087072
Contributor : Patricia Poupon <>
Submitted on : Friday, July 21, 2006 - 10:39:55 AM
Last modification on : Tuesday, October 20, 2020 - 10:56:02 AM

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Karl Joulain, Carsten Henkel. Electromagnetic field correlations near a surface with a nonlocal optical response. Applied Physics B - Laser and Optics, Springer Verlag, 2006, Laser and Optics, pp.1-8. ⟨10.1007/s00340-006-2219-9⟩. ⟨hal-00087072⟩

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