Langmuir-Blodgett (LB) films are formed by transfering organic monolayers from the air- water interface to solid substrates. Since the mid-1980s, the LB method has been recognized as a potential route for fabricating organic thin films for second-order nonlinear optics. However, with few exceptions, previous research activities aimed at such applications were focused primarily on monomeric materials.1 Here we report a nonlinear-optical study of LB films of a series of polymers. Both temporal stability and spatial uniformity of the LB films, as revealed by optical second-harmonic generation (SHG), are shown to be superior to most monomeric LB films. We further demonstrate that their optical nonlinearities can be spatially modified by localized exposure to a UV laser light.

© 1991 Optical Society of America

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