多孔氧化铝薄膜增强三阶光学非线性研究  

Enhanced Third-order Optical Nonlinearity of Porous Anodized Aluminum Oxide Nanostructures

作　　者：赵瑞龙 宋建林[1] 赵建行 周见红[1] ZHAO Rui-long;SONG Jian-lin;ZHAO Jian-xing;ZHOU Jian-hong(Scholl of Optoelectronic Engineering,Changchun University of Science and Technology,Changchun 130022)

机构地区：[1]长春理工大学光电工程学院,长春130022

出　　处：《长春理工大学学报（自然科学版）》2020年第5期44-48,共5页Journal of Changchun University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助(11474041);吉林省科技发展规划项目(20180101281JC)。

摘　　要：利用top-hat Z-扫描研究了多孔氧化铝薄膜对CS2溶液的微纳增强效应。将超薄多孔阳极氧化铝薄膜浸入到非线性溶液CS2中,使用波长为532 nm纳秒激光,对该结构进行top-hat Z-扫描测试。实验结果表明具有薄膜结构的样品在纳秒脉冲下没有表现出非线性吸收响应,但出现了很强的非线性正折射增强效应。实验测得该样品在纳秒脉冲作用下三阶非线性折射率系数γAAO=4×10^-18 m2/W。采用时域有限差分法分析超薄多孔阳极氧化铝薄膜的电场分布,表面局域增强是光学非线性增强的主要来源,对CS2溶液三阶非线性折射率的增强系数高达17.65%,该样品有良好结构增强光学非线性性能。In this paper,the micro-nano enhancement effect of porous alumina film on CS2 solution was studied by top-hat Z-scan.Ultrathin porous anodic alumina film was immersed in a non-linear solution CS2.The structure was tested by tophat Z-scan using 532 nm nanosecond laser.The experimental results show that the samples with thin film structure do not exhibit nonlinear absorption response under nanosecond pulses,but have strong nonlinear positive refraction enhancement effect.The third-order nonlinear refractive index coefficient of the sample under nanosecond pulse was measured to beγ=4×10^-18 m2/W.The electric field distribution of ultra-thin porous anodic alumina film was analyzed by finite difference time domain method.The main source of optical nonlinearity enhancement was the local enhancement of the surface.The enhancement coefficient of the third-order nonlinear refractive index of CS2 solution was up to 17.65%.The sample had good structure-enhanced optical nonlinearity.

关 键 词：阳极氧化铝薄膜 非线性光学 top-hat Z-扫描 结构增强 

分 类 号：O436[机械工程—光学工程]