Actions for Photorefractivity in polymer-stabilized nematic liquid crystals [electronic resource].

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Photorefractivity in polymer-stabilized nematic liquid crystals [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy. Office of Energy Research, 1998.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
8 pages : digital, PDF file
Additional Creators
Argonne National Laboratory, United States. Department of Energy. Office of Energy Research, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Polymer-stabilized liquid crystals, consisting of low concentrations of a polymeric electron acceptor, are shown to exhibit significantly enhanced photorefractive properties. The charge generation and transport properties of these composite systems are strongly modified from nematic liquid crystals doped with electron donors and acceptors. The new composites are produced by polymerizing a small quantity of a 1,4:5,8-naphthalenediimide electron acceptor functionalized with an acrylate group in an aligned nematic liquid crystal. Photopolymerization creates an anisotropic gel-like medium in which the liquid crystal is free to reorient in the presence of a space charge field, while maintaining charge trapping sites in the polymerized regions of the material. The presence of these trapping sites results in the observation of longer lived, higher resolution holographic gratings in the polymer-stabilized liquid crystals than observed in nematic liquid crystals alone. These gratings display Bragg regime diffraction. Asymmetric beam coupling, photo-conductivity, and four-wave mixing experiments are performed to characterize the photophysics of these novel materials.
Report Numbers
E 1.99:anl/chm/cp--96854
E 1.99: conf-980731--
conf-980731--
anl/chm/cp--96854
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Note
Published through SciTech Connect.
07/01/1998.
"anl/chm/cp--96854"
" conf-980731--"
"DE98057787"
43. international symposium on optical science, engineering, and instrumentation, San Diego, CA (United States), 19-24 Jul 1998.
Wasielewski, M.R.; Wiederrecht, G.P.
Funding Information
W-31109-ENG-38
View MARC record | catkey: 14451730