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Title: Photorefractivity in polymer-stabilized nematic liquid crystals

Abstract

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.

Authors:
 [1];  [2]
  1. Argonne National Lab., IL (United States). Chemistry Div.
  2. Argonne National Lab., IL (United States). Chemistry Div.|[Northwestern Univ., Evanston, IL (United States). Dept. of Chemistry
Publication Date:
Research Org.:
Argonne National Lab., IL (United States)
Sponsoring Org.:
USDOE Office of Energy Research, Washington, DC (United States)
OSTI Identifier:
656737
Report Number(s):
ANL/CHM/CP-96854; CONF-980731-
ON: DE98057787; TRN: AHC29817%%295
DOE Contract Number:  
W-31109-ENG-38
Resource Type:
Technical Report
Resource Relation:
Conference: 43. international symposium on optical science, engineering, and instrumentation, San Diego, CA (United States), 19-24 Jul 1998; Other Information: PBD: [1998]
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; LIQUID CRYSTALS; POLYMERIZATION; REFRACTIVE INDEX; COMPOSITE MATERIALS; PHOTOCONDUCTIVITY; TRAPPING; NONLINEAR OPTICS; EXPERIMENTAL DATA; DIFFRACTION GRATINGS

Citation Formats

Wiederrecht, G.P., and Wasielewski, M.R.. Photorefractivity in polymer-stabilized nematic liquid crystals. United States: N. p., 1998. Web. doi:10.2172/656737.
Wiederrecht, G.P., & Wasielewski, M.R.. Photorefractivity in polymer-stabilized nematic liquid crystals. United States. doi:10.2172/656737.
Wiederrecht, G.P., and Wasielewski, M.R.. Wed . "Photorefractivity in polymer-stabilized nematic liquid crystals". United States. doi:10.2172/656737. https://www.osti.gov/servlets/purl/656737.
@article{osti_656737,
title = {Photorefractivity in polymer-stabilized nematic liquid crystals},
author = {Wiederrecht, G.P. and Wasielewski, M.R.},
abstractNote = {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.},
doi = {10.2172/656737},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Jul 01 00:00:00 EDT 1998},
month = {Wed Jul 01 00:00:00 EDT 1998}
}

Technical Report:

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