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High-frequency acousto-optic effects in Bragg reflectors.

D J Farmer, A V Akimov, N A Gippius

    Optics Express
    |July 1, 2014
    PubMed
    Summary

    This study used picosecond acoustic interferometry to investigate the acousto-optic properties of polymer distributed Bragg reflectors (DBRs). Photo-elastic effects were found to explain the observed reflectance changes in response to strain pulses.

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    Area of Science:

    • Materials Science
    • Optics
    • Acoustics

    Background:

    • Distributed Bragg reflectors (DBRs) are crucial optical components.
    • Understanding their acousto-optic properties is essential for advanced applications.
    • Polymer-based DBRs offer unique fabrication and property tuning possibilities.

    Purpose of the Study:

    • To investigate the acousto-optic properties of a polymer-based distributed Bragg reflector (DBR).
    • To explore the influence of picosecond strain pulses on DBR reflectance.
    • To elucidate the underlying mechanisms responsible for the acousto-optic response.

    Main Methods:

    • Utilized picosecond acoustic interferometry to probe the DBR.
    • Injected picosecond strain pulses into a cellulose acetate/polyvinylcarbyzole DBR.
    • Monitored changes in DBR reflectance over time.
    • Employed a transfer matrix method for theoretical modeling.

    Main Results:

    • Observed single-frequency harmonic oscillations in DBR reflectance.
    • Demonstrated that strain pulses modulate the DBR's optical properties.
    • Modeled reflectance changes due to interface modulation and photo-elastic effects.

    Conclusions:

    • Photo-elastic effects are the primary contributors to the acousto-optic response in acoustically matched polymer DBRs.
    • Picosecond acoustic interferometry is a viable technique for characterizing acousto-optic properties.
    • The findings advance the understanding of light-sound interactions in polymer photonic structures.