Photoferroelectric barium titanate (BaTiO3)-polyvinylidene fluoride (PVDF) composite films in the ratio 70:30 are found to possess good photosensitivity in the visible region of the spectrum. Results on investigations of charge generation, trapping, recombination, discharge and retention properties of the composite film are presented in this paper. Photoinduced polarization is obtained in a BaTiO3-PVDF composite film by the simultaneous application of a d.c. field and illumination from an argon-ion laser or by white light. The dark (photo) polarization and the dark (photo) depolarization current decay characteristics of the polarized films have been studied under different experimental conditions. The studies show that the composite film retains good polarization for a fairly long time in the dark condition, and the magnitude of the depolarization current is comparable with that of BaTi03 single crystal. Under illumination, the decay is fast enough to make use of the film for electro-photographic applications.
We report an enhanced holographic image amplification gain of over 24,000 at a wavelength of 514.5 nm by using a BaTiO(3) photoelectret. The energy-transfer efficiency and amplification factor are found to depend on critical polarization conditions of the photoelectret, the beam-mixing geometries, and the intensity ratios between the reference and the object beams. The results obtained corresponding values reported previously.
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