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Abstract
Recording of polarization gratings is realized in porous glass with pore diameter of 40 Å filled with nematic liquid crystal (LC) 4-methoxy-4′-butyl-azobenzene. Such recording is possible due to the strong decrease of the rotational diffusion of LC molecules and their photo-products in pores compared with the bulk. Reversible and irreversible components in the grating formation were observed. These could be associated with different photochemical reactions of LC molecules.