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  • Optical properties of light-sensitive liquid-crystal elastomers in the vicinity of the nematic-paranematic phase transition
    Gregorc, Marko, 1985- ...
    We investigate light-induced patterning of a monodomain side-chain liquid crystal elastomer (SC-LCE) doped with light-sensitive azobenzene moiety in the temperature region close to the ... nematic-paranematic phase transition. We show that a strongly nonlinear relationship between the concentration of the cis isomers of the azomesogens and the refractive index modification of the material, which is characteristic for the phase transition region, results in nonmonotonous time dependence of the diffraction efficiency of a probe beam. From this effect we determine the sensitivity of the nematic transition temperature on the molar fraction of the cis isomers. The relation between the cis isomer molar fraction and nematic order also provides a possibility for recording hidden holograms, which can be made visible by cooling the sample from the paranematic to the nematic phase.
    Source: Physical review. E, Statistical, nonlinear, and soft matter physics. - ISSN 1539-3755 (Vol. 87, iss. 2, 2013, str. 022507-1-022507-7)
    Type of material - article, component part ; adult, serious
    Publish date - 2013
    Language - english
    COBISS.SI-ID - 2533988

    Link(s):

    http://pre.aps.org/abstract/PRE/v87/i2/e022507

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