Noncentrosymmetric Structure of Merocyanine J-Aggregate Assembly Studied by Second-Harmonic Generation
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概要
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We have found that the assembly of J-aggregates in a merocyanine monolayer Langmuir-Blodgett (LB) film has noncentrosymmetric structure by surface second-harmonic generation (SHG). The chromophores align along an average direction, so that the symmetry is C_<2V>. The pure merocyanine monolayer has a large second-order nonlinear susceptibility X_<zzz>=1.3×10^<-7> esu, because of the noncentrosymmetric domain of J-aggregates. The dissociation of the aggregates occurs by heating, resulting in negligible SHG activity due to random orientation of the chromophore on the surface plane. We also confirmed the long-range anisotropic orientation of the chromophore over several millimeters.
- 社団法人応用物理学会の論文
- 1991-08-15
著者
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梶川 浩太郎
東工大・工
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KAJIKAWA Kotaro
Tokyo Institute of Technology, Department of Organic and Polymeric Materials
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Takezoe Hideo
Tokyo Institute Of Technology Department Of Organic And Polymeric Materials
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Fukuda Asuo
Department Of Kansei Engineering Faculty Of Textile Science And Technology Shinshu University
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Fukuda Atsuo
Tokyo Institute Of Technology Department Of Bioengineering
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