非线性光学的Langmuir-Blodgett薄膜

D. Neal, M. C. Petty, G. Roberts, M. H. Ahmad, W. Feast, I. Girling, N. Cade, P. V. Kolinski, I. Peterson
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引用次数: 1

摘要

近年来,人们对具有显著非线性光学特性的介质产生了相当大的兴趣;电信工业可以开发这种材料的薄膜用于信号处理应用。Langmuir-Blodgett (LB)技术提供了一种沉积精确定义厚度的有机层的方法。此外,通过不同材料的交替层,可以制造出没有中心对称的超分子阵列,因此可以利用组成分子的二阶非线性。对一些具有潜在大非线性的新型材料的水表面单层的性质进行了研究。其中一些化合物被证明可以形成高质量的均相或非均相LB膜。通过光学吸收光谱、表面等离子体共振和电容测量来表征这些层的光学和电学性质,同时通过电子衍射来检查它们的结构。一种亚硝基苯乙烯染料的单分子层显示出异常高的结晶有序度。数据也给出了非线性系数的理论计算和相对效率的二次谐波产生从各种材料的散装样品。本文报道了单层膜和多层膜交替产生二次谐波的研究。首次证明了供体-受体交替染料体系的光学非线性。用二次谐波表面磁化率对结果进行了分析,发现第一个双分子层的二阶超极化率比单独层的超极化率简单相加所得到的结果要好得多。发现含有半菁胺和四羧酸镉混合物的单分子层产生二次谐波,其相对于从染料的纯单分子层获得的二次谐波增强。可以观察到各层吸收光谱的相应变化。这些发现可能对提高任何利用IB薄膜的非线性光学器件的效率具有重要意义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Langmuir-Blodgett Films for Nonlinear Optics
In recent years there has been considerable interest in media which display significant non-linear optical properties; the telecommunications industry may exploit chin films of such materials for signal processing applications. The Langmuir-Blodgett (LB) technique provides a means of depositing organic layers of a precisely defined thickness. Moreover, by alternating layers of different materials, supermolecular arrays may be fabricated in which there is no centrosymmetry, and therefore the second-order non-linearity of the constituent molecules may be exploited. An investigation of the properties of water-surface monolayers of a number of novel materials with potentially large non-linearities is described. Several of these compounds are shown to form high quality homogeneous or heterogeneous LB films. The optical and electrical properties of the layers are characterized by optical absorption spectroscopy, surface plasmon resonance, and measurements of capacitance, whilst their structure is examined by electron diffraction. Monolayers of a nitrostilbene dye are shown to exhibit: on exceptionally high degree of crystalline order. Data are also given for theoretical calculations of non-linear coefficients and for the relative efficiency of second harmonic generation from bulk samples of various materials. Studies of second harmonic generation from monolayer and alternate multilayer films are reported. Optical non-linearity in an alternating donor-acceptor: inverted donor-acceptor dye system is demonstrated for the first time; the results are analysed in terms of second harmonic surface susceptibilities, and the value of the second-order hyperpolarizability determined for the first bilayer is found to be much superior to that expected by the simple addition of the hyperpolarizabilities of the separate layers. Monolayers containing a mixture of hemicyanine and cadmium arachldate are found to give rise to second harmonic generation which is enhanced relative to that obtained from a pure monolayer of the dye. Corresponding changes in the absorption spectra of the layers can be observed. These findings may have important implications for improving the efficiencies of any non-linear optical device which utilises IB films.
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