Electric-field-induced cholesteric liquid crystal phase gratings were investigated by means of changing the film thickness-to-natural-pitch ratio d / p 0 and the applied voltage. Planar parallel (180°)-, antiparallel (0°)- and twist (90°)-aligned films were fabricated. By varying the d / p 0 value, we found that the stripes of the gratings could only be in two directions. It was interesting that the directions were mutually perpendicular. This device could be used as a grating switch.
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Wu et al. (2002) studied this question.