Longitudinally modulated nematic bandgap structure

    Authors

    H. Sarkissian; B. Y. Zeldovich;N. Tabiryan

    Comments

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    Abbreviated Journal Title

    J. Opt. Soc. Am. B-Opt. Phys.

    Keywords

    LIQUID-CRYSTALS; SCATTERING; Optics

    Abstract

    We discuss a planar nematic liquid-crystal structure with the director periodically twisted in the light propagation direction (periodically twisted nematic) as a medium, which exhibits bandgap and strong reflection for any polarization at normal incidence. This is in contrast to the cholesteric liquid crystals, which reflect only one of the two circular polarizations. The size of the bandgap depends on the modulation profile and amplitude, and its maximal magnitude is smaller, but of the same order as the bandgap of cholesterics with similar material parameters (refractive indices and pitch). The second-order bandgap reflection exhibits polarization universality only for large enough modulation. (c) 2006 Optical Society of America.

    Journal Title

    Journal of the Optical Society of America B-Optical Physics

    Volume

    23

    Issue/Number

    8

    Publication Date

    1-1-2006

    Document Type

    Article

    Language

    English

    First Page

    1712

    Last Page

    1717

    WOS Identifier

    WOS:000239713500032

    ISSN

    0740-3224

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