Title

Photoalignment of Liquid Crystals by Liquid Crystals

Publication Title

Physical Review Letters

Publication Date

2-28-2000

Document Type

Article

DOI

10.1103/PhysRevLett.84.1930

Disciplines

Physics

Abstract

We observed light-induced alignment of the nematic liquid crystal, 4,4′−n−pentylcyanobiphenyl (5CB), on a fused quartz. Irradiation of the adsorbed layer with polarized ultraviolet light produced homogeneous alignment in a 5CB-filled liquid crystal cell with the easy orientation axis perpendicular to the polarization direction. The measured anchoring energy increases with illumination up to 10−4erg/cm2. Phase retardation and pretilt measurements confirmed near homogeneous alignment of the LC in a cell, while the polarization dependence of second harmonic generation suggested a near normal alignment of the adsorbed layer. We believe that light-induced rearrangement or phototransformation of the adsorbed layer causes the observed phenomenon.

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