Photoinduced anisotropy in an azo-containing ionic liquid-crystalline polymer |
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| Authors: | Xu Pan Changshun Wang Peng Cai Qinghua Lu |
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| Affiliation: | a Department of Physics, Shanghai Jiao Tong University, Shanghai 200240, PR China
b School of Chemistry and Chemical Technology, Shanghai Jiao Tong University, Shanghai 200240, PR China |
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| Abstract: | Photoinduced anisotropy in an azobenzene ionic liquid-crystalline polymer was investigated through dichroism, birefringence and polarization holography. A dichroism degree of 1.58 and a birefringence value Δn ∼ 10−2 were achieved in the polymer film at room temperature, and the polymer film was found to possess the characteristics of reversible and long-term optical storage. Particularly the stored birefringence could be enhanced to Δn ∼ 10−1 by annealing the film, and it is attributed to the thermal self-organization of the molecules. Furthermore, linear- and circular-polarization holographic recordings were accomplished in the polymer film and pure polarization gratings were produced. |
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| Keywords: | 42.25.Lc 42.40.Lx 42.70.Ln |
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