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A novel electro-optical storage effect has been found in a certain smectic liquid crystal. The optical transmission of a smectic liquid film changes with the application of a dc or an ac exciting voltage and remains in the excited state after the field is removed. Some different effects are observed in a thin (12-μ) and a thick (100-μ) sample. The optical contrast ratios of a thin sample are about 10 : 1. The decay of the optical storage effect is a few percent in a week at 42 °C. V–I characteristics of the samples exhibit negative resistance which seems to suggest the change of the molecular state induced by electric fields.
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Chizuka Tani (1971) studied this question.
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