一种侧链共轭聚噻吩衍生物薄膜的三阶非线性光学响应  

The third-order nonlinear optical properties of a side-chain conjugated polythiophene film

作　　者：高潮[1,2] 肖奇[1] 邱少君[1] 侯超奇[2] 许培培[1] 刘建群[1] 

机构地区：[1]西安近代化学研究所,西安710065 [2]中国科学院西安光学精密机械研究所瞬态光学与光子技术国家重点实验室,西安710119

出　　处：《物理学报》2009年第5期3578-3583,共6页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:60578039);陕西省工业攻关计划(批准号:2007K06-06);中国博士后科学基金(批准号:20070421134);西安近代化学研究所开发基金资助的课题~~

摘　　要：合成了一种侧链共轭的聚噻吩衍生物聚3-(5′辛基-噻吩乙烯基)噻吩(POTVTh),并通过溶液旋涂制备了聚合物薄膜.吸收光谱显示该聚合物薄膜具有较小的禁带宽度和宽的光谱响应.采用Z扫描技术在800nm下用飞秒激光器研究了该聚合物薄膜的三阶非线性光学特性,非线性吸收系数为5.63×10-7cm/W,非线性折射率为-6.38×10-11cm2/W,三阶非线性极化率为4.21×10-9esu,比侧链未共轭的共轭聚合物材料大一到两个数量级,说明该聚合物具有良好的三阶非线性光学特性.A novel side-chain conjugated polythiophene derivative poly [ 3-（ 5＇-octyl-thienylene-vinyl）-thiophene] （POTVTh） was synthesized. The polymer films showed a broad absorption band and a narrow bandgap of about 1.82 eV. The third order nonlinear optical properties of the film were measured by Z-scan technique at 800 rim, which showed the nonlinear absoption coefficient, the nonlinear optical refractive index and third order nonlinear optical susceptibility as 5.63 × 10^-7 cm/W, - 6.38 × 10^-11 cm^2/W and 4.32 × 10^-9 esu, respectively. The results are one to two orders of magnitude larger than those of normal conjugated polymers without conjugated side-chain, indicating the good nonlinear optical properties of the polymer.

关 键 词：聚噻吩衍生物 侧链共轭 三阶非线性极化率 非线性折射率 

分 类 号：O437[机械工程—光学工程] TN304.25[理学—光学]