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Framework for tunable polarization state generation using Berry's phase in silicon waveguides.

Ryan J Patton, Ronald M Reano

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    |July 19, 2020
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    Summary
    This summary is machine-generated.

    This study introduces a novel silicon waveguide framework for arbitrary optical polarization control using Berry's phase. The method enables precise polarization rotation and tuning for integrated photonic applications.

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    Area of Science:

    • Photonics
    • Integrated Optics
    • Quantum Optics

    Background:

    • Precise control of optical polarization is crucial for integrated photonic systems.
    • Existing methods for polarization generation and manipulation can be complex or limited in scope.

    Purpose of the Study:

    • To develop a framework for an arbitrary polarization state generator using silicon strip waveguides.
    • To exploit Berry's phase for achieving precise polarization rotation and tuning on a chip.

    Main Methods:

    • Utilizing a cascade of in-plane and out-of-plane silicon strip waveguides.
    • Establishing criteria for passive devices to achieve 90° polarization rotation.
    • Deriving explicit equations for parameter optimization.
    • Employing numerical modeling to validate performance.

    Main Results:

    • Defined regions for active polarization tuning across the entire Poincaré sphere.
    • Demonstrated ±30 dB tuning of polarization extinction ratio between quasi-TE and quasi-TM modes.
    • Validated performance for devices with deflection angles from 5° to 45° and modal birefringence from 0 to 0.05.

    Conclusions:

    • The proposed framework enables on-chip, arbitrary control of optical polarization states.
    • This technology has potential applications in optical communications, sensing, and computing.