首页|Photo-alignment effect in liquid-crystal films containing nanoparticles and azo-dye
Photo-alignment effect in liquid-crystal films containing nanoparticles and azo-dye
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NSTL
Trans Tech Publications Ltd
This work reports the photo-alignment effect in a liquid-crystal film doped with nanoparticles and azo-dye. Vertical alignment induced by the nanoparticles polyhedral oligomeric silsesquioxanes (POSS) can be switched to homogeneous alignment by the absorption of photo-excited azo-dye. Both electro-optical and surface properties are analyzed to verify this effect. Using this photo-alignment technique in nanoparticle- and azo-dye-doped liquid crystal, the phase grating is also demonstrated. The diffraction efficiency is related to the polarization of the probe light and can be controlled by applying voltage. Both nanoparticle- and azo-dye-induced vertical and homogeneous alignments are non-contact aligning methods. Thus, the technique based on dopant-induced alignment has potential for practical applications.
Tsung-Hsien Lin、Wen-Zheng Chen
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Department of Photonics, National Sun Yat-sen University, Kaohsiung, Taiwan, 80424, R.O.C.
NETL
NSTL
Trans Tech Publications Ltd
