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Abstract
Optical second harmonic generation is used to probe the alignment of liquid crystal monolayers on surfaces treated with different methods. The results provide definitive information about physical mechanisms responsible for the surface-induced bulk liquid crystal alignment. Infrared-visible sum-frequency generation allows the measurements of vibrational spectra of molecular monolayers at an interface. It is used to see how liquid molecules interact with long-chain surfactants to yield homeotropic bulk alignment.
