TY  - JOUR
A1  - Henkel, Carsten
A1  - Joulain, Karl
T1  - Electromagnetic field correlations near a surface with a nonlocal optical response
N2  - 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/z(3) 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
Y1  - 2006
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/11948
UR  - http://www.springerlink.com/content/100502
SN  - 0946-2171
ER  -