Optical second harmonic generation (SHG) has recently proved a potential tool for probing and observing phenomena of the surface and interface. We here report probing polymerization of Langmuir-Blodgett (L-B) monomolecular layers by optical SHG, we believe for the first time. Because the number of molecules in an L-B molecular monolayer are few, it is too difficult to probe the polymerization by using general IR, UV, or NMR methods; however, during polymerization, transformations of relevant atom radicals and valence bonds of the molecules would cause changes in the molecular nonlinear polarizability, whereas the molecules in an L-B film are packed regularly. It would thus result in changes in the SHG being contributed from L-B molecular layers.

© 1988 Optical Society of America

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