Electric-field-induced dynamics in radial liquid crystal droplets studied by multiphoton-excited fluorescence microscopy
Electric-field-induced dynamics in radial liquid crystal droplets studied by multiphoton-excited fluorescence microscopy
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DOI：
10.1063/1.1748846
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发表时间：
2004-05
影响因子：
4
通讯作者：
A. Xie;D. Higgins
中科院分区：
文献类型：
--
作者：
A. Xie;D. Higgins
用时间分辨多光子激发荧光显微镜研究了聚合物分散液晶膜中单液滴的电场诱导重取向动力学。对分散在聚甲基丙烯酸异丁酯基质中的向列型液晶薄膜进行了表征。利用嵌入在薄膜中的两根平行铜线，在每个液滴上横向施加电场。用2 0 0μS时间分辨率记录了光场开启和关闭时的三光子激发荧光图像。在单个液滴内的取向弛豫时间尺度上观察到了显著的空间变化。这些效应归因于聚合物/液晶界面的相互作用和液晶通过暂态、亚稳态组织状态的弛豫。
Time-resolved multiphoton-excited fluorescence microscopy is used to study electric-field-induced reorientation dynamics in single liquid crystal (LC) droplets within polymer-dispersed liquid crystal films. Films comprised of nematic LC dispersed in a poly(isobutyl methacrylate) matrix are characterized. An electric field is applied laterally across each droplet, using two parallel copper wires embedded in the film. Three-photon excited fluorescence images are recorded with 200 μs time resolution as the field is modulated on and off. Dramatic spatial variations in the time scales for orientational relaxation within individual droplets are observed. These effects are attributed to polymer/LC interfacial interactions and relaxation of the LC through a transient, metastable organizational state.