Third-Order Nonlinear Optical Properties of a Series of Polythiophenes  

作　　者：张小强 王长顺 陆国元 贺廷超 

机构地区：[1]Department of Physics, the State Key Laboratory on Fiber Optic Local Area Communication Networks and Advanced Optical Communication Systems, Shanghai Jiao Tong University, Shanghai 200240 [2]Department of Chemistry, Nanjing University, Nanjing 210093

出　　处：《Chinese Physics Letters》2010年第7期101-104,共4页中国物理快报（英文版）

基　　金：Supported by the National Science Foundation of China under Grant No 10675083, and the Fund of the State Key Laboratory of Advanced Optical Communication Systems and Networks （Shanghai Jiao Tong University）.

摘　　要：The third-order nonlinear optical properties of a series of polythiophenes are investigated with the Z-scan method under picosecond pulse laser irradiation at 532nm. The copolymers exhibit a good nonlinear response： large nonlinear refraction coefficients without nonlinear absorption. The signs of nonlinear refraction coefficients are positive, which are opposite to the negative signs of the polythiophene reported before. The mechanism accounting for the process of nonlinear refraction under pulse laser excitation is analyzed from the viewpoint of the electrondonor/acceptor units of polythiophenes. Moreover, changes of nonlinearity according to the lengths of main chains in polythiophene molecules are discussed.The third-order nonlinear optical properties of a series of polythiophenes are investigated with the Z-scan method under picosecond pulse laser irradiation at 532nm. The copolymers exhibit a good nonlinear response： large nonlinear refraction coefficients without nonlinear absorption. The signs of nonlinear refraction coefficients are positive, which are opposite to the negative signs of the polythiophene reported before. The mechanism accounting for the process of nonlinear refraction under pulse laser excitation is analyzed from the viewpoint of the electrondonor/acceptor units of polythiophenes. Moreover, changes of nonlinearity according to the lengths of main chains in polythiophene molecules are discussed.

分 类 号：O631.24[理学—高分子化学] TQ324.8[理学—化学]