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Heterodyned Femtosecond Optical Kerr Effect of Substituted Conjugated Polymers |
| LIN Li1;QIAN Wei1;WANG Cong-fang1;ZOU Ying-hua1;WANG Qian2;CHEN Hui-ying2 |
| 1Department of Physics, Mesoscopic Physics Laboratory, 2Institute of Polymer Science, College of Chemistry, Peking University, Beijing 100871 |
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| Cite this article: |
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LIN Li, QIAN Wei, WANG Cong-fang et al 1999 Chin. Phys. Lett. 16 656-658 |
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Abstract The femtosecond optical heterodyne detected optical Kerr effect is described. The real and the imaginary parts of complex third-order optical nonlinearity can be effectively separated and their values and signs can be determined. Using this method, we have thoroughly investigated the substitution effect by adding side-groups on the -(-C=N-)- conjugated system, a new class of nonlinear optical material, and find that the polybenzonitrile (γr = -1.59 x10-31 esu, m = 6 ) is an order of magnitude superior to poly-amino-nitrile. But when we further add substituents on benzoid rings, the enhancement is limited. We can say that for the series of polybenzonitrile, the benzoid ring can improve the x(3) value more effectively than other substitutions.
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| Keywords:
42.65.An
42.70.Jk
78.47.+p
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Published: 01 September 1999
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