Electro-optic effect,propagation loss,and switching speed in polymers containing nano-sized droplets of liquid crystal |
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Authors: | Shiro Matsumoto Yasuyuki Sugiyama Seizou Sakata Takayoshi Hayashi |
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Institution: | 1. Department of Chemistry, Faculty of Science , University of Cairo , Giza, Egypt;2. Egyptian Petroleum Research Institute (EPRI) , Nasr City, Egypt |
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Abstract: | Polymers containing droplets of liquid crystal smaller than 100 nm, which have good transparency and easily form films, were prepared under various conditions to evaluate their potential as electro-optic materials for waveguide-type devices. By varying the liquid crystal concentration and the strength of the UV irradiation causing photo-induced phase separation of the droplets, we were able to control the droplet size and density. We have clarified how the birefringence generated in an applied electric field, switching speed, and optical loss of light propagating in the film depend on droplet size and density. Polymer materials having a large electro-optic effect (δn = 0.001 at 8 V μm-1), low propagation loss (~2.5 dB cm-1), and fast response time (~10 μs) have been developed. |
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Keywords: | antiferroelectric liquid crystals azo linkage group dielectric properties ferroelectricity lactate group photosensitivity |
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