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Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
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Ultra-compact hybrid plasmonic mode convertor based on unidirectional eigenmode expansion.

Ruixuan Chen, Bowen Bai, Fenghe Yang

    Optics Letters
    |February 15, 2020
    PubMed
    Summary

    Researchers developed an ultra-compact hybrid plasmonic mode convertor using a novel slot waveguide. This device achieves efficient TE00-to-TM01 mode conversion with high purity and broad bandwidth.

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    Area of Science:

    • Photonics and Plasmonics
    • Integrated Optics
    • Nanophotonics

    Background:

    • Hybrid plasmonic waveguides offer unique light confinement properties.
    • Efficient mode conversion is crucial for optical signal processing and communication.

    Purpose of the Study:

    • To demonstrate an ultra-compact hybrid plasmonic mode convertor.
    • To achieve high-performance TE00-to-TM01 mode conversion.

    Main Methods:

    • Utilized a hybrid plasmonic slot waveguide structure.
    • Employed a unidirectional eigenmode expansion approach for mode interference.
    • Fabricated and characterized the device at 1550 nm and across the C-band.

    Main Results:

    • Achieved the first reported TE00-to-TM01 mode convertor with an ultra-compact footprint (2.33 × 7 µm²).
    • Demonstrated insertion loss below 2.34 dB and extinction ratio of 25.6 dB at 1550 nm.
    • Obtained high mode conversion purity (94.6%) and a broad extinction ratio bandwidth (>110 nm).
    • Achieved low crosstalk for TE10 (-16.1 dB) and TE02 (-22.7 dB) modes.

    Conclusions:

    • The demonstrated hybrid plasmonic mode convertor is highly efficient and compact.
    • This device shows significant potential for advanced photonic integrated circuits.
    • The ultra-compact design and broad bandwidth are advantageous for optical communication systems.