SMALL PERTURBATION ANALYSIS OF DIFFRACTED HOLOGRAPHIC GRATINGS

Plane-wave scattering by a holographic grating is presented. The grati ng layer can be considered as a perturbation imposed on the uniform me dium. Based on the perturbation analysis, this perturbation becomes th e source of a diffraction wave and the boundary-value problem can be t ranslated into the equivalent transmission-line equations with distrib uted current source; therefore, the Green function technique is utiliz ed here to calculate the fields in the grating layer. The numerical ex amples are carefully compared and found to agree quite well with exact results obtained by rigorous treatment.