盐LB单分子层膜的非线性光学性质

合成了一种能够形成单分子层膜,又具有很大分子二阶非线性极化率的有机分子材料——菧盐。对菧盐单分子层膜进行了光学二次谐波信号的测量,得到其分子二阶非线性极化率=1.2×10~(-27)esu。但它很难构成稳定的多层膜结构。本文首次报道菧盐/花生酸混合Langmuir-Blodgett(简计L-B)膜的制备及其非线性光学性能研究,混合膜就一般分子材料不能既具有较大的二阶非线性极化率,又能形成稳定的多层膜结构这一难题的可行性进行了探索。实验证明,混合膜是制备高倍频系数的稳定多层膜的可行措施之一。

Nonlinear optical properties of Langmiur-Blodgett films of stilbazium salt

An organic compound-stilbazium salt with large moleoalar hyperpolarizabllity was synthesized which can form molecular monolayer. The optical seoond-harmonio signal of the stilbazium salt monolayer was measured and the molecular hyperpola-rizability β was obtained, to be 1.2×10-27 esu. Unfortunately, it is difficult to fabricate stable multilayer of the stilbazium salt. We reported in this article the fabrication of mixed stilbazium salt/araohidio acid Langmiur-Blodgett (LB) films and the studies of their nonlinear optical properties, in order to explore the possibility of the mixed films in preparing the stable molecular multilayer structure with large second-order susceptibility. The experimental results showed that the mixing of two suitable compounds is a way to fabricate stable multilayer films with high nonlinear coefficients.