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Proceedings Paper

Optical properties of novel poled ferroelectric nanocrystals and polymer BaTiO3/PC composite films
Author(s): W.C. Liu; A.D. Li; J. Tan; C.L. Mak; K. H. Wong; D. Wu; Nai-Ben Ming
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Paper Abstract

BaTiO3 (BT) nanocrystals doped polycarbonate polymer composite thin films (BT/PC) with different BT concentrations were prepared by spin coating method. Ultra-fine BT (~40-50 nm) nanocrystals with pure perovskite tetragonal phase were synthesized by hydrothermal method. The structure of BT nanocrystals and composite films were studied by means of XRD and TEM. The composite films were poled with a high electric field at a suitable temperature to yield a non-centrosymmetric arrangement and get better electro-optic properties. The Electro-optic (E-O) coefficients of composite films with various BT concentration were also evaluated. The average effective linear E-O coefficient and figure of merit of 20 wt% BT doped composite films were estimated to be 63.1 pm/V and 103.1 pm/V, respectively. The E-O properties of BT/PC composite films were further enhanced by increasing the concentration of the doped BT nanocrystals when the concentration of BT nanocrystals in composite films was low. The orientation degree of BT nanocrystals in PC polymer was detected by measuring the transparency spectra of unpoled and poled composite thin films.

Paper Details

Date Published: 28 January 2005
PDF: 8 pages
Proc. SPIE 5646, Nonlinear Optical Phenomena and Applications, (28 January 2005); doi: 10.1117/12.573859
Show Author Affiliations
W.C. Liu, Nanjing Univ. (China)
Hong Kong Polytechnic Univ. (Hong Kong China)
A.D. Li, Nanjing Univ. (China)
J. Tan, Nanjing Univ. (China)
C.L. Mak, Hong Kong Polytechnic Univ. (Hong Kong China)
K. H. Wong, Hong Kong Polytechnic Univ. (Hong Kong China)
D. Wu, Nanjing Univ. (China)
Nai-Ben Ming, Nanjing Univ. (China)

Published in SPIE Proceedings Vol. 5646:
Nonlinear Optical Phenomena and Applications
Qihuang Gong; Yiping Cui; Roger A. Lessard, Editor(s)

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