Electric-field-induced nematic-cholesteric transition and 3-D director structures in homeotropic cells

Details Electric-field-induced nematic-cholesteric transition and 3-D director structures in homeotropic cells Electric-field-induced nematic-cholesteric transition and 3-D director structures in homeotropic cells

2005-12-16

arxiv.org/abs/cond-mat/0512365v1

Physics

Condensed Matter

Soft Condensed Matter

Will be published in Physical Review E

Scientific paper

10.1103/PhysRevE.72.061707

We study the phase diagram of director structures in cholesteric liquid crystals of negative dielectric anisotropy in homeotropic cells of thickness d which is smaller than the cholesteric pitch p. The basic control parameters are the frustration ratio d/p and the applied voltage U. Fluorescence Confocal Polarising Microscopy allows us to directly and unambiguously determine the 3-D director structures. The results are of importance for potential applications of the cholesteric structures, such as switchable gratings and eyewear with tunable transparency based.

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