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Strip-slot waveguide mode converter based on symmetric multimode interference.

Qingzhong Deng, Lu Liu, Xinbai Li

    Optics Letters
    |November 1, 2014
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel strip-slot mode converter for integrated photonics, utilizing symmetric multimode interference (MMI) for efficient light coupling. The device achieves high efficiency and is robust against fabrication errors and wavelength variations.

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    Area of Science:

    • Integrated photonics
    • Waveguide design
    • Nanophotonics

    Background:

    • Optical mode mismatch hinders efficient coupling between strip and slot waveguides.
    • Existing mode converters often rely on gradual mode conversion, posing design challenges.

    Purpose of the Study:

    • To develop a novel strip-slot mode converter for efficient light coupling in integrated photonics.
    • To leverage symmetric multimode interference (MMI) for mode conversion.
    • To achieve high-efficiency, compact, and robust waveguide coupling.

    Main Methods:

    • Numerical simulations and experimental validation of a strip-slot mode converter.
    • Utilizing symmetric multimode interference (MMI) for mode conversion.
    • Designing a device based on MMI symmetry and field distribution similarity.

    Main Results:

    • Achieved a measured strip-slot waveguide coupling efficiency of 97% (-0.13 dB).
    • The developed mode converter has compact dimensions (1.24×6 μm).
    • Demonstrated high tolerance to fabrication imperfections and wavelength insensitivity.

    Conclusions:

    • The proposed symmetric MMI-based mode converter offers a highly efficient solution for strip-slot waveguide coupling.
    • The device's robustness and compact size make it suitable for integrated photonic applications.
    • This approach overcomes limitations of previous mode converters, enabling versatile light manipulation.