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Thickness-independent dynamics in cholesteric liquid crystals.

We report fast electro-optic response independent of cell thickness in cholesteric liquid crystals (ChLCs). Usually, an electric field normal to the helix axis of ChLCs induces two fast and one slow response components: helical elongation (slow one), helical deformation (fast one), and flexoelectric effect (fast one). In this study, we found that a planarly aligned ChLC applied with an in-plane electric field exhibited only fast response components because the glass substrates suppressed the motion of the helical elongation. Furthermore, we demonstrated complete separation of the remaining fast components by using dielectric measurement system. Consequently, we were able to analyze dynamics of the helical deformation in detail, in which response times exhibited quadratic dependence on the helical pitch and no dependence on the cell thickness.