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Instabilities are discussed which take place when a nematic liquid crystal(LC) layer, enclosed between a planar reference plate and a photosensitivesubstrate, is illuminated with polarized light from the reference side ({\itreverse} geometry). The dependence of the observed effects on the wavelength,polarization direction of the light, and on the thickness of the LC layer isexplained by a model based on photoinduced surface torque. The applicationpossibilities of the phenomena are also explored.

Instabilities induced by Light in Liquid Crystal Cells with a Photo-Responsive Substrate