Abstract
We describe here a device using a relaxation process in smectic A liquid crystals. Two stable structures can exist in the smectic A phase : one is a quasi homeotropic texture (optically transparent) and the other is a focal conic structure (scattering texture). The transition is obtained by locally heating the material to a temperature closed to the smectic nematic transition temperature. This effect is used to duplicate an image on a liquid crystal cell.
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