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Abstract
Dynamics of a smectic layer alignment in ferroelectric and antiferroelectric liquid crystals, in particular, the reversible rotation of a smectic layer alignment by application of asymmetric voltage pulses has been investigated. The direction of layer normal can be controlled by application of voltage pulses, and in other words, the optical axis of the sample is controllable by selecting the waveform of applied voltage pulses. Moreover, we observed a movement of the SiO2 particles which were doped into the sample. Although in the isotropic and nematic phases, SiO2 particles move circularly, in the smectic A and chiral smectic C phases which have a layer structure, all particles move linearly along the smectic layer.