부산대학교 도서관

To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.optcom.2006.08.048 Byline: Guoping Dong (a), Haizheng Tao (a), Saisai Chu (b), Shufeng Wang (b), Xiujian Zhao (a), Qihuang Gong (b), Xiudi Xiao (a), Changgui Lin (a) Keywords: Third-order optical nonlinearity; Chalcogenide glasses; Ultrafast; Structure Abstract: The results of the femtosecond time-resolved optical Kerr at 820nm in GeS.sub.2-In.sub.2S.sub.3 chalcogenide glasses indicate that the response time in GeS.sub.2-In.sub.2S.sub.3 glasses is subpicosecond, which is predominantly due to the distortion of the electron cloud. The value of I.sup.(3) in 0.95GeS.sub.2-0.05In.sub.2S.sub.3 glass is also as large as 2.7x10.sup.-13 esu, and it reduces with the addition of In.sub.2S.sub.3, which may be ascribed to the microstructure evolution of GeS.sub.2-In.sub.2S.sub.3 glasses. It is deduced that the intrinsic [Ge(In)S.sub.4] tetrahedral structure units that possess the high hyperpolarizability may do great contribution to the enhancement of third-order optical nonlinearity while [S.sub.3Ge-GeS.sub.3] ethane-like molecular units make no considerable contribution to that in femtosecond time scale. These GeS.sub.2-In.sub.2S.sub.3 and GeS.sub.2-In.sub.2S.sub.3-based chalcogenide glasses would be expected to be the promising materials for all-optical switching devices. Author Affiliation: (a) Key Laboratory of Silicate Materials Science and Engineering (Wuhan University of Technology) Ministry of Education, Luoshi Road 122, Hongshan Qu, Wuhan, Hubei 430070, China (b) State Key Laboratory for Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871, China Article History: Received 2 June 2006; Revised 25 August 2006; Accepted 29 August 2006