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Polymer film with optically controlled form and actuation.

Nelson Tabiryan, Svetlana Serak, Xiao-Man Dai

    Optics Express
    |June 6, 2009
    PubMed
    Summary

    Researchers used a low-power laser to rapidly change polymer film shapes. By adjusting the laser

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    Area of Science:

    • Polymer Science
    • Optics
    • Materials Science

    Background:

    • Photoresponsive polymers offer dynamic shape-changing capabilities.
    • Azobenzene moieties are known to undergo trans-cis isomerization upon light exposure.

    Purpose of the Study:

    • To investigate the photoinduced shape variation in polymer films using a low-power laser.
    • To demonstrate control over the direction of polymer film bending and twisting.
    • To explore the mechanism of optically induced reorientation of azobenzene moieties.

    Main Methods:

    • Irradiation of a polymer film with a low-power laser beam.
    • Modulation of the laser beam's polarization.
    • Observation and measurement of induced shape changes (bending/twisting).

    Main Results:

    • Large and fast shape variations (contraction and expansion) were induced in the polymer film.
    • The direction of photoinduced bending or twisting was reversible by altering the laser beam's polarization.
    • Film orientation could be controlled within a range of +/-70 degrees.

    Conclusions:

    • Low-power laser irradiation can induce significant and rapid shape changes in polymer films.
    • Polarization control of the laser beam allows for reversible manipulation of polymer film orientation.
    • The observed phenomenon is attributed to the optical reorientation of azobenzene groups within the polymer network.

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