Optical properties of novel poled ferroelectric nanocrystals and polymer BaTiO3/PC composite films

W.C. Liu; A.D. Li; J. Tan; C.L. Mak; K. H. Wong; D. Wu; Nai-Ben Ming

doi:10.1117/12.573859

28 January 2005 Optical properties of novel poled ferroelectric nanocrystals and polymer BaTiO₃/PC composite films

W.C. Liu, A.D. Li, J. Tan, C.L. Mak, K. H. Wong, D. Wu, Nai-Ben Ming

Proceedings Volume 5646, Nonlinear Optical Phenomena and Applications; (2005) https://doi.org/10.1117/12.573859
Event: Photonics Asia, 2004, Beijing, China

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.

Citation Download Citation

W.C. Liu, A.D. Li, J. Tan, C.L. Mak, K. H. Wong, D. Wu, and Nai-Ben Ming "Optical properties of novel poled ferroelectric nanocrystals and polymer BaTiO₃/PC composite films", Proc. SPIE 5646, Nonlinear Optical Phenomena and Applications, (28 January 2005); https://doi.org/10.1117/12.573859

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