Second-Harmonic Generation from Y-Type Deposition of N-Acyl-p-Nitroaniline Langmuir-Blodgett Films

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Abstract
The second-order nonlinear optical properties of Y-type-deposited N-acyl-p-nitroaniline Langmuir-Blodgett films are studied. The second-harmonic intensity from the film shows a large anisotropy in the dipping direction and is dependent on the acyl-chain length. The same kind of anisotropy and dependence is observed in UV absorbance. It is indicated that the orientation of the p-nitroaniline group in the molecule is changed by the chain length by means of X-ray diffraction and IR spectroscopy.