Electric-field-induced nematic-cholesteric transition and three-dimensional director structures in homeotropic cells

I. I. Smalyukh, B. I. Senyuk, P. Palffy-Muhoray, O. D. Lavrentovich, H. Huang, E. C. Gartland, V. H. Bodnar, T. Kosa, B. Taheri
2005 Physical Review E  
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
more » ... as switchable gratings and eyewear with tunable transparency based.
doi:10.1103/physreve.72.061707 pmid:16485964 fatcat:wzavrrxh5jcaje2cj4zxmoyqu4