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Related Experiment Videos

Rotating polarization using Berry's phase in asymmetric silicon strip waveguides.

Ryan J Patton, Ronald M Reano

    Optics Letters
    |March 2, 2019
    PubMed
    Summary

    Curvilinear waveguides use Berry's phase to control optical polarization. A new method overcomes waveguide asymmetry, achieving 90-degree polarization rotation for integrated photonic devices.

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    Area of Science:

    • Photonics
    • Integrated Optics
    • Waveguide Technology

    Background:

    • Light in curvilinear waveguides gains Berry's phase, rotating optical polarization.
    • This effect is key for waveguide polarization controllers.
    • Waveguide asymmetry in high index contrast platforms limits polarization rotation.

    Purpose of the Study:

    • To present a method for periodic spatial modulation of Berry's phase.
    • To achieve 90-degree polarization rotation despite waveguide asymmetry.
    • To demonstrate a polarization conversion technique for silicon-on-insulator waveguides.

    Main Methods:

    • Numerical modeling using Jones calculus.
    • Simulation of asymmetric silicon waveguides (303×300 nm²).
    • Periodic spatial modulation of Berry's phase.

    Main Results:

    • Achieved 90-degree polarization rotation in asymmetric waveguides.
    • Demonstrated polarization conversion from transverse electric to transverse magnetic.
    • Obtained a polarization extinction ratio (PER) > 20 dB.
    • Achieved broadband operation over 100 nm bandwidth.
    • Utilized a compact footprint (110×240 μm²).

    Conclusions:

    • Periodic modulation of Berry's phase effectively overcomes waveguide asymmetry.
    • The proposed method enables efficient polarization control in integrated photonic circuits.
    • This approach is suitable for silicon-on-insulator platforms and offers broadband performance.

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