OPTICAL LINEAR ANISOTROPY IN HEMICYANINE LANGMUIR-BLODGETT MULTILAYERS

Polarized UV-visible absorption spectroscopy was used to investigate t he in-plane orientation of the hemicyanine molecules in Y-type Langmui r-Blodgett multilayers. We demonstrated for the first time that the di pping-induced molecular alignment was enhanced with increasing the lay er number due to the interlayer interactions. Polarized UV nanosecond pulses could be used to control the photo-induced reorientation of the hemicyanine molecules. The thermal-isotropic process was accompanied by dissociation of the H-aggregate in the hemicyanine LB multilayers.