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Extremely small polarization beam splitter based on a multimode interference coupler with a silicon hybrid plasmonic

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    A novel silicon hybrid plasmonic waveguide enables a compact polarization beam splitter (PBS). This device offers broadband operation and fabrication tolerance, paving the way for miniaturized photonic integrated circuits.

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    Area of Science:

    • Photonics
    • Nanotechnology
    • Integrated Optics

    Background:

    • Miniaturization of optical components is crucial for advanced photonic integrated circuits.
    • Developing compact and efficient polarization beam splitters (PBS) remains a significant challenge.
    • Silicon hybrid plasmonic waveguides offer unique properties for subwavelength light confinement and manipulation.

    Purpose of the Study:

    • To propose and numerically demonstrate a novel, ultra-compact polarization beam splitter (PBS).
    • To leverage multimode interference (MMI) in a silicon hybrid plasmonic waveguide for polarization-selective splitting.
    • To achieve a device with a small footprint, broadband operation, and high fabrication tolerance.

    Main Methods:

    • Design of a multimode interference (MMI) coupler integrated with a silicon hybrid plasmonic waveguide.
    • Partial covering of the MMI section with a metal strip to engineer polarization-dependent behavior.
    • Numerical simulations to analyze the performance, including extinction ratio (ER) and operational bandwidth.
    • Investigation of fabrication tolerance by varying waveguide and metal strip dimensions.

    Main Results:

    • An ultra-compact PBS with a footprint as small as approximately 1.8 μm × 2.5 μm was designed.
    • The device demonstrated mirror imaging for TE polarization and suppressed MMI effect for TM polarization.
    • A broad operational bandwidth of approximately 80 nm for an ER > 10 dB was achieved.
    • Significant fabrication tolerance was confirmed, allowing for variations in silicon core and metal strip widths.

    Conclusions:

    • The proposed silicon hybrid plasmonic MMI-based PBS offers a highly compact and efficient solution.
    • The design exhibits excellent performance characteristics, including broadband operation and robustness to fabrication variations.
    • This technology holds promise for the development of next-generation miniaturized optical systems and integrated photonic devices.