I. Dorofeyev et al., Spectral power densities of fluctuating electromagnetic fields and their derivatives in a plane cavity, PHYS LOW-D, 3-4, 2001, pp. 77-80
We calculated spectral power densities of the fluctuating electromagnetic f
ield and its spatial derivatives in a plane gap between the two half-spaces
characterized by different complex permittivities. It was shown that the s
pectral properties of the field for a half-space follow from the general ca
se.