We describe an electro-optic modulator using ferroelectric liquid crystal. A smectic C* material with a 45° tilt angle is sandwiched between two glass plates with buffing directions perpendicular to each other. This produces a twisted smectic structure in absence of an electric field. When used with polarizers, the twisted structure can be electrically distorted to produce optical modulation on a sub-millisecond time scale using less than 1 V/μm.
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Jay Patel (1992) studied this question.
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