Abstract
Nanosecond laser pulse induced molecular reorientation in azobenzene doped liquid crystals (LCs) in the isotropic phase was studied by the optical heterodyned optical Kerr effect method. Reorientation inversion was found by artificially preparing a cis isomer enriched initial state. The interaction strength ratio of trans and cis isomers with the LC molecules was deduced based on a modified mean-field theory model. Our results provide a further understanding of the photo-induced reorientation of photo-isomerizable dye-doped LC systems.
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