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arXiv 1109.2170cond-mat.softcond-mat.mtrl-sci
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偏振方位角对nematic liquid-crystal易轴电助光诱导滑移动力学的影响

Effects of polarization azimuth in dynamics of electrically assisted light-induced gliding of nematic liquid-crystal easy axis

A. V. Dubtsov, S. V. Pasechnik, Alexei D. Kiselev, D. V. Shmeliova, V. G. Chigrinov

摘要:

实验研究了在面内电场和改变偏振方位的线偏振紫外光$ϕ_p$的共同作用下,光取向偶氮染料薄膜中的液晶易轴的再取向动力学.与光偏振矢量平行于初始易轴和$ϕ_p=0$的情况相反,在$ϕ_p\ne 0$处,在电极间间隙之外观察到明显的纯光致重取向。在非零电场的电极间区域,发现$ϕ_p$的重取向动力学变慢,易轴旋转方向与$ϕ_p$的符号无关。

英文摘要:

We experimentally study the reorientation dynamics of the nematic liquid crystal easy axis at photoaligned azo-dye films under the combined action of in-plane electric field and reorienting UV light linearly polarized at varying polarization azimuth, $ϕ_p$. In contrast to the case where the light polarization vector is parallel to the initial easy axis and $ϕ_p=0$, at $ϕ_p\ne 0$, the pronounced purely photoinduced reorientation is observed outside the interelectrode gaps. In the regions between electrodes with non-zero electric field, it is found that the dynamics of reorientation slows down with $ϕ_p$ and the sense of easy axis rotation is independent of the sign of $ϕ_p$.

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