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本文利用 Z扫描测量技术首次对半花菁 LB膜的三阶非线性光学特性进行了研究 .实验结果表明 ,LB多层膜中的半花菁分子具有较高的三阶非线性折射率 n2 =2 .0× 1 0 - 8( esu) ,这主要是半花菁分子中 π电子体系的贡献 ,并且由于 5 3 2 nm在其 Q吸收带内 ,引起三阶非线性的共振增强效应 ,实验数据与理论拟合结果符合得很好 .半花菁 LB膜的三阶非线性的响应时间在 3 0 ns以内
In this paper, the third-order nonlinear optical properties of semi-cyanine LB films were studied for the first time by using Z-scan measurement technique.The experimental results show that hemicyanine molecules in LB multilayer films have higher third-order nonlinear refractive index n2 = 2 .0 × 10 ~ 8 (esu), which is mainly the contribution of the π electron system in the hemicyanine molecule and causes a third-order nonlinear resonance enhancement effect due to the 532 nm band in its Q absorption band. Experiments The data fit well with the theoretical fitting results.The response time of third-order nonlinearity of semi-cyanine LB film is less than 30 ns