高等学校化学学报

高等学校化学学报 ›› 1995, Vol. 16 ›› Issue (3): 419.

• 论文 • 上一篇    下一篇

亚相中加卤化物的半花菁衍生物LB膜的二次谐波研究

马世红1, 陆兴泽1, 韩奎1, 郑家骠1, 王文澄1, 张兆奎2   

  1. 1. 三束材料改性国家联合重点实验室(复旦分部), 徽光物理和光学实验室, 复旦大学物理系, 上海 200433;
    2. 华东理工大学物理系
  • 收稿日期:1994-06-02 修回日期:1994-09-15 出版日期:1995-03-24 发布日期:1995-03-24
  • 通讯作者: 马世红,男,30岁,博士研究生.
  • 作者简介:马世红,男,30岁,博士研究生.
  • 基金资助:

    “863”高技术;国家自然科学基金

Second-Harmonic Generation form Hemicyanine Derivative Langmuir-Blodgett Monolayers Deposited with Halide Salts in the Subphase

MA Shi-Hong1, LU Xing-Ze1, HAN Kui1, ZHENG Jia-Biao1, WANG Wen-Cheng1, ZHANG Zhao-Kui2   

  1. 1. State Key Joint Laboratory for Materials Modification by Laser Electron Beams(Fudan Branch), Laboratory of Laser Physics and Optics, Fudan University, Shanghai 200433;
    2. Department of Physics, East China University of Science and Technology, Shanghai 200237
  • Received:1994-06-02 Revised:1994-09-15 Online:1995-03-24 Published:1995-03-24

PDF (PC)

摘要： 报道了亚相中KI对纯的及混合的半花菁衍生物E-N-二十二烷基-4-[2-(4-二乙氨基)苯乙烯基]氢溴酸吡啶嗡(DAEP)单分子层膜的π-A曲线、紫外-可见吸收光谱及二次谐波产生的影响,并探讨了其物理机制。当KI浓度加大时,分子有效二阶非线性极比率β随之增大并始终伴随着吸收峰的红移。分子电荷分布的改变及激发态能量的减小导致二次谐波近共振增强效应是分子有效β值增大的主要原因之一。

关键词: 光学二次谐波产生, Langmuir-Blodgett单分子层膜, 半花菁衍生物

Abstract: Anew hemicyanine derivative E-N-docosyl-4-[2-(4-diethyl-aminopheny) ethenyl]pyridinium bromide(DAEP),was adopted to investigate the effects of KIin the subphase on pure and mixed DAEP monolayers by π-A, UV-Vis absorption and second harmonic generation(SHG) measurements, as well as the physical mechanisms were involved. We found that with increasing KIconcentration in the subphase,an enhancement of the effective molecular hyperpolarizabilityβwas always associated with a red-shift of the absorption peak in both pure and mixed DAEP monolayers. Charge distribution change and reduction of the excited state energy result in a second harmonic resonant effect were one of the main mechanisms responsible for the enhancement of the effective molecular hyperpolarizability in DAEP Langmuir-Blodgett monolayers.

Key words: Optical second harmonic generation, Langmuir-Blodgett monolayer, Hemicyanine derivative

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