Influence of laser writing of polyimides on the alignment of liquid crystals

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    Abstract

    The effect of direct laser writing in polyimides on the alignment of org. liq. crystals was investigated. Laser writing was performed below the ablation threshold, which resulted in local melting of the polyimide. A surface relief structure was obtained as a result of the fast heating and cooling cycle during laser writing. No alignment of org. liq. crystals in the vicinity of the surface relief structure was obsd. as a direct result of the laser writing process. However, it appeared to be possible to wipe out the alignment originating from the rubbing process. This property proved to be useful to generate complex patterns in twisted nematic liq. crystal cells with locally uniaxial alignment. The contrast between the nonpatterned and patterned areas ranged between 40 and 50, which illustrates that the earlier described phenomena are potentially useful in, for instance, personalized security features. [on SciFinder (R)]
    Original languageEnglish
    Pages (from-to)4191-4195
    JournalJournal of Applied Physics
    Volume91
    Issue number7
    DOIs
    Publication statusPublished - 2002

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    polyimides
    liquid crystals
    alignment
    lasers
    crystals
    ablation
    melting
    cooling
    cycles
    heating
    thresholds
    cells

    Cite this

    @article{cadadf5990f14880ae7e237016b1a374,
    title = "Influence of laser writing of polyimides on the alignment of liquid crystals",
    abstract = "The effect of direct laser writing in polyimides on the alignment of org. liq. crystals was investigated. Laser writing was performed below the ablation threshold, which resulted in local melting of the polyimide. A surface relief structure was obtained as a result of the fast heating and cooling cycle during laser writing. No alignment of org. liq. crystals in the vicinity of the surface relief structure was obsd. as a direct result of the laser writing process. However, it appeared to be possible to wipe out the alignment originating from the rubbing process. This property proved to be useful to generate complex patterns in twisted nematic liq. crystal cells with locally uniaxial alignment. The contrast between the nonpatterned and patterned areas ranged between 40 and 50, which illustrates that the earlier described phenomena are potentially useful in, for instance, personalized security features. [on SciFinder (R)]",
    author = "D.J. Versteeg and C.W.M. Bastiaansen and D.J. Broer",
    year = "2002",
    doi = "10.1063/1.1459104",
    language = "English",
    volume = "91",
    pages = "4191--4195",
    journal = "Journal of Applied Physics",
    issn = "0021-8979",
    publisher = "American Institute of Physics",
    number = "7",

    }

    Influence of laser writing of polyimides on the alignment of liquid crystals. / Versteeg, D.J.; Bastiaansen, C.W.M.; Broer, D.J.

    In: Journal of Applied Physics, Vol. 91, No. 7, 2002, p. 4191-4195.

    Research output: Contribution to journalArticleAcademicpeer-review

    TY - JOUR

    T1 - Influence of laser writing of polyimides on the alignment of liquid crystals

    AU - Versteeg, D.J.

    AU - Bastiaansen, C.W.M.

    AU - Broer, D.J.

    PY - 2002

    Y1 - 2002

    N2 - The effect of direct laser writing in polyimides on the alignment of org. liq. crystals was investigated. Laser writing was performed below the ablation threshold, which resulted in local melting of the polyimide. A surface relief structure was obtained as a result of the fast heating and cooling cycle during laser writing. No alignment of org. liq. crystals in the vicinity of the surface relief structure was obsd. as a direct result of the laser writing process. However, it appeared to be possible to wipe out the alignment originating from the rubbing process. This property proved to be useful to generate complex patterns in twisted nematic liq. crystal cells with locally uniaxial alignment. The contrast between the nonpatterned and patterned areas ranged between 40 and 50, which illustrates that the earlier described phenomena are potentially useful in, for instance, personalized security features. [on SciFinder (R)]

    AB - The effect of direct laser writing in polyimides on the alignment of org. liq. crystals was investigated. Laser writing was performed below the ablation threshold, which resulted in local melting of the polyimide. A surface relief structure was obtained as a result of the fast heating and cooling cycle during laser writing. No alignment of org. liq. crystals in the vicinity of the surface relief structure was obsd. as a direct result of the laser writing process. However, it appeared to be possible to wipe out the alignment originating from the rubbing process. This property proved to be useful to generate complex patterns in twisted nematic liq. crystal cells with locally uniaxial alignment. The contrast between the nonpatterned and patterned areas ranged between 40 and 50, which illustrates that the earlier described phenomena are potentially useful in, for instance, personalized security features. [on SciFinder (R)]

    U2 - 10.1063/1.1459104

    DO - 10.1063/1.1459104

    M3 - Article

    VL - 91

    SP - 4191

    EP - 4195

    JO - Journal of Applied Physics

    JF - Journal of Applied Physics

    SN - 0021-8979

    IS - 7

    ER -