All-Optical Photorefractive Effect in Carbazole-Based Azo-Side Group Polymer  

作　　者：黄毛毛 陈志坚 石军 曹少魁 龚旗煌 

机构地区：[1]School of Physics, State Key Laboratory for Mesoscopic Physics, Peking University, Beijing 100871 [2]College of Materials Engineering, Zhengzhou University, Zhengzhou 450052

出　　处：《Chinese Physics Letters》2006年第9期2468-2471,共4页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant Nos 60407004, 10521002, 10434020, 60378012, 90206003, 10328407 and 90101027, the National Key Basic Research Special Foundation （NKBRSF） of China under Grant No TG1999075207.

摘　　要：We observe the photorefractivity without bias voltage or prepoling in a bifunctional photorefractive polymer. The maximum two-beam coupling gain is measured to be 126cm^-1 at zero bias voltage. The sample is considered to be poled by the photoinduced longitudinal electric field, which is formed due to the light intensity gradient along the light path. The expression of the electric field was deduced. The energy transfer direction between two writing beams and light intensity dependence of the two-beam coupling gain coefficient is predicted to be consistent with the experimental results. Furthermore, the dependence of the two-beam coupling gain coefficient on external applied electrical field is measured and this experiment verifies the existence of the photoinduced longitudinal electric field.We observe the photorefractivity without bias voltage or prepoling in a bifunctional photorefractive polymer. The maximum two-beam coupling gain is measured to be 126cm^-1 at zero bias voltage. The sample is considered to be poled by the photoinduced longitudinal electric field, which is formed due to the light intensity gradient along the light path. The expression of the electric field was deduced. The energy transfer direction between two writing beams and light intensity dependence of the two-beam coupling gain coefficient is predicted to be consistent with the experimental results. Furthermore, the dependence of the two-beam coupling gain coefficient on external applied electrical field is measured and this experiment verifies the existence of the photoinduced longitudinal electric field.

关 键 词：ELECTRIC-FIELD COMPOSITES 

分 类 号：O436.4[机械工程—光学工程]