Z扫描法测单壁碳纳米管薄膜非线性特性的研究  

Research on Nonlinear Characteristics of SWCNT Film by Z-Scan Method Measurement

作　　者：朱攀[1] 桑梅[1] 王晓龙[1] 刘珂[1] 杨天新[1] 

机构地区：[1]天津大学精密仪器与光电子工程学院光电信息技术教育部重点实验室,天津300072

出　　处：《激光与光电子学进展》2012年第9期93-100,共8页Laser & Optoelectronics Progress

基　　金：天津市自然科学基金(10JCYBJC01200);国家973计划(2010CB327806);国家自然科学基金面上项目(61072011);天津市自然科学基金重点项目(12JCZDJC20700)资助课题

摘　　要：为研究单壁碳纳米管(SWCNT)薄膜的三阶非线性光学性质,采用旋转涂覆法在石英玻片上制备出包含SWCNT和聚甲基丙烯酸甲酯(PMMA)的聚合物薄膜。测得薄膜的线性透射谱,并观察了薄膜的表面形貌。为提高测量SWCNT薄膜三阶非线性系数的准确度,研究了Z扫描法测量材料的非线性系数时相关参量变化对测量准确度的影响,并搭建Z扫描系统,研究了自制薄膜的三阶非线性光学性质。通过对实验数据的模拟和计算,得到自制碳纳米管薄膜的非线性吸收系数(β)、三阶非线性折射系数(γ)分别为-7.8×10-7 cm/W、-6.4×10-11 cm2/W,三阶非线性极化率为2.06×10-9 esu。证明SWCNT/PMMA薄膜具有较强的非线性光学特性。In order to study the third order nonlinear optical property of single-walled carbon nanotube（SWCNT） film,we prepare polymer film of SWCNTs and poly methyl methacrylate（PMMA） on quartz substrate by rotation coating.We obtain linear transmission spectrum and surface morphology of the film.For improving the measurement accuracy of the third order nonlinear coefficient of SWCNT polymer film,we discuss the influence of the changes in related parameters of the Z scanning method upon the measurement accuracy of the material nonlinear coefficient,and build Z scanning system to study the third order nonlinear optical properties of the thin film.Through the simulation and calculation of experimental data,we obtain that the third order nonlinear absorption coefficient（β） and the third order nonlinear refractive coefficient（γ） of this SWCNT film are-7.8×10-7 cm/W and-6.4×10-11 cm2/W,respectively,and the third order nonlinear susceptibility is 2.06×10-9 esu.The results prove that SWCNT/PMMA film owns strong nonlinear optical properties.

关 键 词：测量 非线性光学 三阶非线性系数 Z扫描法 单壁碳纳米管薄膜 准确度 

分 类 号：TN247[电子电信—物理电子学]