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Biphotonic effect-induced phase transition in dye-doped cholesteric liquid crystals and their applications |
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| Authors: | San-Yi Huang Hung-Chang Jau Jui-Hsiang Liu Andy Ying-Guey Fuh |
| Institution: | a Institute of Electro-Optical Science and Engineering, National Cheng Kung University, Tainan 70101, Taiwan b Department of Physics, National Cheng Kung University, Tainan 70101, Taiwan c Department of Chemical Engineering, National Cheng Kung University, Tainan 70101, Taiwan d Department of Applied Chemistry, Chaoyang University of Technology, Taichung 41349, Taiwan e Advanced Optoelectronic Technology Center, National Cheng Kung University, Tainan 70101, Taiwan |
| Abstract: | This work studies the biphotonic effect in samples that are cholesteric liquid crystals (CLCs) doped with azo-C5. The experimental results show that the photo-isomerization of azo-C5 not only changes the clearing point of the sample, but also shifts the reflection band that is associated with the planar texture. Additionally, azo dye-doped CLCs (DDCLCs) have bi-stable or tri-stable states, as determined by the ambient temperature. Photo-switching between these bi-stable/tri-stable states is systematically studied. The result indicates that photo-addressing one of these states (planar, focal conic, and isotropic states) using a low- or high-intensity Ar+ laser beam is feasible. The results thus obtained are used to fabricate a photo-rewritable DDCLC display. |
| Keywords: | Biphotonic effect Cholesteric liquid crystal Azo dye Trans-cis Photo-switching Photo-rewritable |
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