Photoswitching properties of photonic band gap materials containing azo-polymer liquid crystal

Masaki Moritsugu, Tomomi Shirota, Shoichi Kubo, Sun Nam Kim, Tomonari Ogata, Takamasa Nonaka, Osamu Sato, Seiji Kurihara

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    Photochemically tunable photonic band gap materials were prepared by infiltration of liquid crystal polymers having azobenzene groups into voids of SiO2 inverse opal films. Linearly polarized light irradiation resulted in transformation from a random to an anisotropic molecular orientation of azobenzene side chains in the voids of the SiO2 inverse opal film, leading to the reversible and stable shift of the reflection band to longer wavelength more than 15 nm. In order to improve switching properties, we used copolymers with azobenzene monomer and tolane monomer, which indicate higher birefringence, as infiltration materials into the voids. The azo-tolane copolymers were found to show the higher birefringence than azobenzene homopolymers by the linearly polarized light irradiation. Thus, the reflection band of the SiO2 inverse opal film infiltrated with the azo-tolane copolymers was shifted to long wavelength region more than 55 nm by the irradiation of linearly polarized light.

    Original languageEnglish
    Title of host publicationLiquid Crystals XII
    DOIs
    Publication statusPublished - 2008
    EventLiquid Crystals XII - San Diego, CA, United States
    Duration: 2008 Aug 112008 Aug 12

    Publication series

    NameProceedings of SPIE - The International Society for Optical Engineering
    Volume7050
    ISSN (Print)0277-786X

    Other

    OtherLiquid Crystals XII
    Country/TerritoryUnited States
    CitySan Diego, CA
    Period08/8/1108/8/12

    Keywords

    • Azobenzene
    • Birefringence
    • Inverse opal
    • Photo-alignment
    • Photonic crystal

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics
    • Computer Science Applications
    • Applied Mathematics
    • Electrical and Electronic Engineering

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