We have prepared a second harmonic (SH) active polymer LB film of copoly(2-{N-ethyl-N-[4-(4-nitrophenylazo)phenyl]amino}ethyl acrylate/methyl methacrylate) by means of horizontal deposition. Considerably high susceptibilities χzzz=41.9 pm/V (1.00×10−7 esu) and χzxx=7.33 pm/V (1.75×10−8 esu) were obtained without poling process. Although the initial 4 monolayers show no SH activity, the monolayers more than fifth have a SH active structure.
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Kajikawa et al. (1993) studied this question.
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