Open AccessEFFECT OF THE ELECTROSTATIC INTERACTIONS OF CHROMOPHORES ON THE MACROSCOPIC SECOND-ORDER NONLINEAR OPTICAL PROPERTIES OF THE POLYMER FILMS
Author(s) -
Wei Shi,
Changfeng Fang,
Z. Xu,
Qiwei Pan,
Xian Zhao,
Gu Qin-Tian,
Xu Dong,
Jinzhong Yu
Publication year - 2000
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.49.904
Subject(s) - chromophore , polymer , materials science , nonlinear optical , doping , chemical physics , nonlinear optics , optics , nonlinear system , optoelectronics , photochemistry , chemistry , composite material , physics , laser , quantum mechanics
The polyetherketone (PEK-c) guest-host system thin films doped with 3-(1,1-dicyanothenyl)-1-phenyl-4,5-dihydro-1H-pryazole (DCNP) were prepared. Their second-order nonlinear optical (NLO) coefficients χ33(2) were measured by using Maker fringe method for the polymer films doped with different weight percents of DCNP. Experimental results indicate that the second-order NLO properties of the poled polymer films could decrease with the chromophore loading increasing when the chromophore loading reaches a fairly high level. In this paper, the relationship between the macroscopic second-order NLO coefficient and the chromophore number density was modified under considering the role of the electrostatic interactions of chromophores in the polymer film. According to the modified relationship, the macroscopic second-order NLO coefficient is no longer in direct proportion with the chromophore number density in the polymer film. The effect of the electrostatic interactions of chromophores on second-order NLO properties was discussed. The attenuation of the macroscopic second-order NLO activity can be demonstrated by the role of the chromophore electrostatic interactions at high loading of chromophore in the polymer systems.