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On-chip silicon switchable polarization beam splitter.

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    We developed a novel on-chip switchable polarization beam splitter (PBS) using silicon waveguides. This device can split and switch polarized light paths, advancing integrated photonic technologies.

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    Area of Science:

    • Photonics
    • Integrated Optics
    • Semiconductor Devices

    Background:

    • On-chip optical components are crucial for miniaturizing complex photonic systems.
    • Polarization beam splitters (PBS) are fundamental for manipulating light polarization.
    • Existing on-chip PBS typically lack dynamic switching capabilities.

    Purpose of the Study:

    • To propose and demonstrate the first on-chip switchable polarization beam splitter (PBS).
    • To enable dynamic control over the output paths of split polarization beams on a chip.
    • To enhance the functionality of integrated photonic devices for advanced applications.

    Main Methods:

    • Design of a switchable PBS based on a silicon directional coupler.
    • Experimental fabrication and characterization of the on-chip device.
    • Utilizing thermal tuning (heating up to 57°C) to switch output paths.

    Main Results:

    • Successful demonstration of an on-chip switchable PBS.
    • Achieved extinction ratios greater than 12 dB in both initial and switched states.
    • Verified the ability to tune and switch output paths via thermal control.

    Conclusions:

    • The developed switchable PBS offers enhanced functionality for integrated photonics.
    • This technology is expected to benefit quantum technology, optical communications, and microwave photonics.
    • The integration of switching capability into on-chip PBS is a significant advancement for photonic integrated circuits.