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Abstract
Abstract Optical bistability and limiting have been studied in surface stabilized ferroelectric liquid crystal (SSFLC) with electrical feedback. Optical bistability and limiting are observed for the cases of positive and negative feedback gains, respectively. The hysteresis in the voltage-transmission curve which is characteristic of the SSFLC is found to contribute to the expansion of the optical bistable region in the positive feedback and to the appearance of the bistability in the negative feedback. Dynamic characteristics of switching between optical bistable states by an incident light pulse have also been studied. A new multi-logic element with both OR and AND functions which can be selected by controlling the duration of the reset light pulse can be realized. Besides of dc voltage operation, the ac operation of the feedback without dc bias voltage is also realized in the liquid crystal which shows antiferroelectric behavior and a symmetrical voltage-transmission curve.
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