Optical Microscopy Studies of Dynamics within Individual Polymer-Dispersed Liquid Crystal Droplets

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• 作者：Daniel A. Higgins ; Jeffrey E. Hall ; and Aifang Xie
• 刊名：Accounts of Chemical Research
• 出版年：2005
• 出版时间：February 2005
• 年：2005
• 卷：38
• 期：2
• 页码：137 - 145
• 全文大小：986K
• 年卷期：v.38,no.2(February 2005)
• ISSN：1520-4898

文摘

Optical devices based on polymer-dispersed liquid crystal (PDLC)thin films derive their functional properties from the electric-field-induced reorientation of (sub)micrometer-sized polymer-dispersedliquid crystal (LC) droplets. In these materials, the LC reorientationdynamics are strongly dependent on droplet size and shape, aswell as polymer/LC interfacial interactions. The dynamics also varyspatially within individual droplets. This Account describes studiesof individual PDLC droplets and their field-induced dynamics byhigh-resolution near-field scanning optical microscopy (NSOM)and multiphoton-excited fluorescence microscopy (MPEFM). Included are studies of native ("pure") PDLCs and those doped withionic compounds and dyes; the latter are used in sophisticatedphotorefractive materials.