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Light-induced director reorientation through the electroclinic effect and optic axis rotation in a chiral smectic A liquid crystal.

We report the observation of light-induced director reorientation under the application of an electric field in a chiral smectic A liquid crystal owing to the temperature dependence of the electroclinic coefficient. We also demonstrate the occurrence of another light-induced phenomenon that leads to optic axis rotation, whose origin is not yet clear. Finally, we show that thermal indexing cannot be neglected when fitting the experimental data.