Abstract
Second-harmonic generation (SHG) studies have been carried out on Langmuir–Blodgett films of 2-docosyl-amino-5-nitropyridine that were transferred by two different dipping techniques: vertical y-type and horizontal x-type depositions. The SHG behavior of horizontally transferred films is remarkably different from that of the vertically transferred films. In y-type films the SHG is due mainly to the in-plane component (which is along the dipping axis) of the second-order nonlinear optical susceptibility tensor and is negligible. In the case of x-type films, the SHG is due to the in-plane χ(2) tensor components but and have comparable magnitudes. In both films the nonlinear optical chromophores lie almost flat with respect to the plane of the substrate. The cancellation of in y-type films is due to the preferential orientation of molecular domains along the dipping axis. In horizontally transferred films, molecular domains seem to be randomly distributed on the surface.
© 1993 Optical Society of America
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