Abstract
A new mechanism of photorefractivity in nematic liquid crystal cells with photoconductive orienting layers, referred to as dynamic photorefractivity, is proposed. The essence of this mechanism is as follows: an external ac electric field excites quasi-periodic subgratings at the interface between a liquid crystal and a photoconductive orienting layer. The interference optical field, inducing a charge distribution on the surface of the orienting layers, modulates the surface anchoring force and the penetration depth of the external field into the liquid crystal layer. As a result, the surface charge grating azimuthally reorients subgratings according to its structure and stabilizes their period. Since the amplitude of the subgratings is determined by the strength of the applied electric field and the cell parameters, the wave mixing efficiency in the dynamic mode may significantly exceed that in the classical orientational effect.
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