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Phototunable Azobenzene Cholesteric Liquid Crystals with 2000 nm Range

Authors

  • Timothy J. White,

    Corresponding author
    1. Air Force Research Laboratory Materials and Manufacturing Directorate 3005 Hobson Way, Ste. 1 Wright Patterson Air Force Base, OH 45433 (USA)
    • Air Force Research Laboratory, Materials and Manufacturing Directorate 3005 Hobson Way, Ste. 1, Wright Patterson Air Force Base, OH 45433 (USA).
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  • Rebecca L. Bricker,

    1. Air Force Research Laboratory Materials and Manufacturing Directorate 3005 Hobson Way, Ste. 1 Wright Patterson Air Force Base, OH 45433 (USA)
    2. SOCHE Inc. 3155 Research Blvd, Ste. 204, Dayton, OH 45420 (USA)
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  • Lalgudi V. Natarajan,

    1. Air Force Research Laboratory Materials and Manufacturing Directorate 3005 Hobson Way, Ste. 1 Wright Patterson Air Force Base, OH 45433 (USA)
    2. SAIC Inc. 4031 Colonel Glenn Hwy, Dayton, OH 45433 (USA)
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  • Nelson V. Tabiryan,

    1. BEAM Engineering for Advanced Measurements 809 S. Orlando Ave, Winter Park, FL 32789 (USA)
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  • Lisa Green,

    1. Department of Chemical Physics Liquid Crystal Institute Kent State University, P. O. Box 5190 Kent, OH 44242 (USA)
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  • Quan Li,

    1. Department of Chemical Physics Liquid Crystal Institute Kent State University, P. O. Box 5190 Kent, OH 44242 (USA)
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  • Timothy J. Bunning

    Corresponding author
    1. Air Force Research Laboratory Materials and Manufacturing Directorate 3005 Hobson Way, Ste. 1 Wright Patterson Air Force Base, OH 45433 (USA)
    • Air Force Research Laboratory, Materials and Manufacturing Directorate 3005 Hobson Way, Ste. 1, Wright Patterson Air Force Base, OH 45433 (USA).
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Abstract

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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