CENTRALLY SYMMETRIC LIQUID CRYSTAL POLARIZATION DIFFRACTIVE WAVEPLATE AND ITS FABRICATION

摘要

Invention relates to development of centrally symmetric liquid crystal polarization diffraction waveplate (LC CDW) and its fabrication method. In the created optical element the ordering of LC molecules directors along each radius corresponds to axial LC polarization diffraction grating (PDG), and in two PDGs recorded along one diameter, the ordering of LC directors is symmetric regarding the center. Recording is based on illumination of substrate coated by photo-orienting material and is realized by overlapping of two - left and right circularly polarized beams through optical gap with angular sector shape, the peak of which coincides with the center of circular substrate. When illuminating by linearly polarized beam at the output of centrally symmetric LC CDW only in +/-1 diffraction orders the centrally symmetric diffracted beams in the shape of inscribed circle, corresponding to left and right circularly polarized components, are observed.