Polarization- and thickness-dependent near fields of small phase-shifting structures.

ABSTRACT

The spatial distribution of amplitude and phase in the diffraction near field behind phase-shifting structures of infinite length and small rectangular cross section (microwave measurements yield good agreement. The computed near fields are compared to the structure images in the range of geometrical optics. Quantitative relations are derived for the deviations between the corresponding angular spectra, depending on polarization of the incident wave and structure thickness.