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    Area of Science:

    • Photonics
    • Materials Science
    • Optical Engineering

    Background:

    • Polarization beam splitters (PBS) are crucial components in photonic integrated circuits.
    • Existing PBS designs often face limitations in reconfigurability, size, and energy efficiency.
    • Phase-change materials offer promising avenues for dynamic optical control.

    Purpose of the Study:

    • To design and demonstrate a compact, reconfigurable polarization beam splitter (PBS).
    • To leverage the phase-change properties of antimony selenide (Sb2Se3) for dynamic polarization routing.
    • To achieve high performance in terms of low crosstalk and insertion loss.

    Main Methods:

    • Utilizing a directional coupler (DC) architecture.
    • Harnessing phase-change-mediated mode coupling in Sb2Se3.
    • Optimizing the DC region for efficient polarization splitting.

    Main Results:

    • Demonstrated efficient polarization splitting with crosstalk below -21.3 dB.
    • Achieved insertion loss below 0.16 dB at 1550 nm for both phase states.
    • Showcased energy-efficient operation due to the nonvolatile phase change of Sb2Se3.

    Conclusions:

    • The proposed compact reconfigurable PBS offers excellent performance and energy efficiency.
    • Sb2Se3 is a viable material for dynamic polarization control in integrated photonics.
    • The device holds significant potential for applications in polarization-division multiplexing, quantum photonics, and microwave photonics.