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The third-order optical nonlinearity of the J-aggregates of nonionic dye in vapor-deposited films has been investigated in terms of electroabsorption measurement. Compared with that of a monomer film of the dye, the nonlinearity was enhanced by a factor of 4000. However, the number of aggregates in the J-aggregate film was estimated to be only a few. The obtained enhancement is mainly caused by the...
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