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C. Henkel and K. Joulain
Electromagnetic near field correlations at a surface with a nonlocal optical response
Appl. Phys. B 84 (2006) 61-68, special issue `Optics on the nano-scale'.


    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 spatial 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 semiclassical 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.

    The original publication is available at link.springer.de or at link.springer-ny.com. © Springer-Verlag 2006
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file generated: 18 Apr 2007

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