NONCENTROSYMMETRIC STRUCTURE OF MEROCYANINE J-AGGREGATE ASSEMBLY STUDIED BY 2ND-HARMONIC GENERATION

被引：33
作者：
KAJIKAWA, K
TAKEZOE, H
FUKUDA, A
机构：
[1] Tokyo Institute of Technology, Department of Organic and Polymeric Materials, Meguro-ku, Tokyo, 152, O-okayama
来源：
JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS | 1991年 / 30卷 / 8B期
关键词：
2ND-HARMONIC GENERATION; SURFACE 2ND-HARMONIC GENERATION; MEROCYANINE; J-AGGREGATE; MONOLAYER; LB FILM;
D O I：
10.1143/JJAP.30.L1525
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
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 C2v. The pure merocyanine monolayer has a large second-order nonlinear susceptibility chi-zzz = 1.3 x 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.
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页码：L1525 / L1528
页数：4
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