DYNAMIC HOLOGRAPHIC GRATINGS IN NEMATIC CELL WITH PERIODIC BOUNDARY-CONDITIONS

Nematic cell with light intensity spatial grating is considered. The i nfluence of periodic spatial modulation of the director anchoring ener gy and the easy orientation axis at the cell surfaces on the director spatial distribution in the liquid crystal bulk under the action of li ght is investigated. It is shown that in both cases the director distr ibution takes the form of a superposition of the cosine gratings with periods which are the linear combinations of the light intensity and b oundary condition periods. The Frederiks transition threshold value is calculated for homeotropic cell with periodic modulation of the ancho ring energy.