SCATTERING OF PARTIALLY COHERENT ELECTROMAGNETIC-FIELDS BY MICROSTRUCTURED MEDIA

Scattering of a two-dimensional, spatially partially coherent electrom agnetic field by a two-dimensionally-modulated microstructured medium is treated exactly by means of the coherent-mode representation of the cross-spectral density tenser and a rigorous diffraction theory for f ully coherent fields. An explicit method of solution is provided for a n isolated groove or slit in a perfectly conducting substrate. The res ults demonstrate a significant impact of a reduced degree of spatial c oherence an the radiant intensity of the field diffracted by such a mi crostructure. The validity of results obtained on the basis of Kirchho ff's boundary conditions is also assessed.