Abstract
A compact spatial light modulator having optical bistability has been constructed with a twisted nematic liquid-crystal layer, a polarizing film, and a Bi12SiO20 crystal layer. The optical bistability is produced by combining the nonlinear optical transmittance property of the liquid-crystal electro-optic light modulator with the photoconductive property of the Bi12SiO20 crystal layer. The device performs optically bistable operations in a controllable manner, and parallel processing of intensity-level image thresholding is also demonstrated for several threshold levels.
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