Electro-optical investigations of holographic-polymer-dispersed ferroelectric liquid crystals |
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Authors: | Woltman Scott J Eakin James N Crawford Gregory P Zumer Slobodan |
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Affiliation: | Division of Engineering, Department of Physics, Brown University, Providence, Rhode Island 02912, USA. |
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Abstract: | Uniform alignment of ferroelectric liquid-crystal domains encapsulated by a polymer binder was established through a holographic exposure process. The refractive index modulation in these thin films is modeled as a phase grating that can be electrically addressed to erase the optical diffractive properties. A phenomenological model is developed to take into account a distribution of domain sizes and an effective field that stabilizes the ferroelectric liquid-crystal domains. A diffraction model successfully predicts changes in normalized intensities for first-order diffraction with applied field. These gratings demonstrate microsecond-scale response and relaxation times for various grating pitch sizes between approximately 3 and approximately 12 microm. |
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