Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 19, Issue 21, Pages 3484-3488Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.200900396
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- Air Force Office of Scientific Research and the Materials and Manufacturing Directorate of the Air Force Research Laboratory
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Phototuning of more than 2000 nm is demonstrated in an azobenzene-based cholesteric liquid crystal (azo-CLC) consisting of a high-helical-twisting-power, axially chiral bis(azo) molecule (QL76). Phototuning range and rate are compared as a function of chiral dopant concentration, light intensity, and thickness. CLCs composed of QL76 maintain the CLC phase regardless of intensity or duration of exposure. The time necessary for the complete restoration of the original spectral properties (position, bandwidth, baseline transmission, and reflectivity) of QL76-based CLC is dramatically reduced from days to a few minutes by polymer stabilization of the CLC helix.
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