2012/12/25 by S. V. Pasechnik, Pasechnik, S. V., A. V. Dubtsov +11
Chemistry · Computer Science · Materials Science · Physics and Astronomy · #FOS: Physical sciences #Liquid Crystal Research Advancements #Materials Science (cond-mat.mtrl-sci) #Nonlinear Dynamics and Pattern Formation #Photochemistry and Electron Transfer Studies #Soft Condensed Matter (cond-mat.soft) #cond-mat.mtrl-sci #cond-mat.soft
paper · pdf · doi:10.48550/arxiv.1212.6044
revtex4, 15 pages, 6 figures. arXiv admin note: substantial text overlap with arXiv:1109.2170, arXiv:1004.3863
arxiv created 2012/12/25 · openalex publication_date 2012/12/25 · arxiv updated 2012/12/27 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The phenomenological torque balance model previously introduced to describe the electrically assisted light-induced gliding is generalized to 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, φp. We systematically examine the general properties of the torque balance model by performing analysis of the bifurcations of equilibria at different values of the polarization azimuth and apply the model to interpret the experimental results. In our experiments, it is found that, in contrast to the case where φp=0 and the light polarization vector is parallel to the initial easy axis, at φp≠ 0, the pronounced purely photoinduced reorientation occurs outside the interelectrode gaps. It is also observed that, in the regions between electrodes with non-zero electric field, the dynamics of reorientation slows down with φp and the sense of easy axis rotation is independent of the sign of φp.