Freedericksz transition and beam coupling in liquid crystals with PVK:C(60) alignment-command layer

摘要

Photorefractive structures consisting of liquid crystals with photoconductive polymer layers have attracted a lot of interest because of their high nonlinearity achieved with low light intensities. In particular, photorefractive polymers such as polyvinyl carbazole (PVK) doped with photosensitiser trinitrofluorene (TNF) or poly(octyl-thiophene) functionalised with dyes showed particularly promising two-beam coupling gain and diffraction.