Model of the formation of holographic polarization gratings in PDLC taking into account light-induced absorption changes and strong surface adhesion

In this paper, an analytical model of the formation of holographic polarization gratings (HPGs) in PDLCs that accounts for light-induced changes in absorption coefficient and the strong adhesion of liquid crystal molecules to the bounding surfaces is developed. Holographic formation by two linearly orthogonally polarized beams is considered. The formation of HPGs in PDLCs is possible due to the light-induced periodic spatial inhomogeneity of the optical anisotropy of the material caused by the superposition of two plane coherent orthogonally polarized waves on the sample plane (under the influence of the photo-induced Fredericks effect), which is stabilized as a result of the phase separation of the PDLC components during the photopolymerization process. Expressions for the exact and approximate solutions of the recording problem are obtained, and numerical simulation of the spatial changes of the dielectric tensor was performed. The obtained results can be used to develop a model of the diffraction of light beams on the spatially inhomogeneous HPGs.