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Polarization of Hemicyanine Langmuir-Blodgett Films |
| LI Shu-Hong1,2;MU Jian1;WANG Wen-Jun1;MA Shi-Hong3;SUN Jing-Lan4;CHU Jun-Hao4;WANG Wen-Cheng3 |
| 1College of Physics Science and Information Engineering, Liaocheng University, Liaocheng 252059
2State Key Laboratory for Advanced Photonic Materials and Devices, Department of Optical Science and Engineering, Fudan University, Shanghai 200433
3State Key Laboratory for Advanced Photonic Materials and Devices, Department of Physics,
Fudan University, Shanghai 200433
4National Laboratory for Infrared Physics, Chinese Academy of Sciences, Shanghai 200083 |
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| Cite this article: |
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LI Shu-Hong, MU Jian, WANG Wen-Jun et al 2004 Chin. Phys. Lett. 21 952-954 |
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Abstract The polarization dependence of electric field for hemicyanine layers deposited by the Langmuir-Blodgett (LB) technique has been measured. The experimental results show that ferroelectricity exists not only in thick films (200 nm) but also in thinner films (30 nm), and the remnant polarization is related to film thickness. In order to interpret the measured results, a planar rotor model was introduced, and a relation between polarization and film thickness was obtained by perturbation theory. The theory fitting agrees with experimental results well. It is confirmed that ferroelectricity in organic molecular LB films mainly arose from altering of molecular orientation.
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| Keywords:
77.80.Dj
77.84.Jd
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Published: 01 May 2004
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| PACS: |
77.80.Dj
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(Domain structure; hysteresis)
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77.84.Jd
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(Polymers; organic compounds)
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