Acta Phys. -Chim. Sin. ›› 1999, Vol. 15 ›› Issue (02): 121-126.doi: 10.3866/PKU.WHXB19990206

• ARTICLE • Previous Articles     Next Articles

Improved Optical Nonlinearity of Poled Stilbene Doped Polymer films

Hou Zhan-Jia, Liu Li-Ying, Xu Lei, Chen Jie, Xu Zhi-Ling, Wang Wen-Cheng, Li Fu-Ming, Ye Ming-Xin   

  1. State Key Joint Laboratory for Matcrials Modification by Laser,Ion and Electron Beams,Department of Physics,Department of Material Science,Fudan University,Shanghai 200433
  • Received:1998-05-11 Revised:1998-06-29 Published:1999-02-15
  • Contact: Hou Zhan-Jia


The optical properties of corona poled 4'-N,N-dimethylamino-mtrostilbene (DANS) and a newly synthesized α'-cyano-4'-mtro-4-N.N-dimethylaminostilbene (CNDS) doped poly(methyl methacrylate) (PMMA) films were investigated with in situ second-harmonic generation (SHG) measurement and absorption measurement. Optimum corona poling temperatures of these polymer films were found lower than glass transition temperatures of the materials, most probably due to the dramatically increased conductivity of the films and phase separation. Under the optimum corona poling condition, the alignment ordering of CNDS was lower than that of DANS from the absorbance before and after corona poling. But the second-order nonlinear susceptibility X(2) of CNDS/PMMA is improved compared with that of DANS/PMMA. The molecular second-order polarizability β of the CNDS/PMMA was estimated to be about 140×10-30 esu from the measured absorbance and X(2). The relaxation of SHG intensity of CNDS/PMMA was slower than that of DANS/PMMA. This showed that CNDS is a kind of better dopant than DANS as second -order nonlinear-optical materials.

Key words: Second-hrmonic generation(SHG), Doped polymer film, Corona poling