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Related Experiment Video

Updated: Jan 19, 2026

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
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Spatial eigenmodes conversion with metasurfaces engraved in silicon ridge waveguides.

Yakov Greenberg, Alina Karabchevsky

    Applied Optics
    |September 11, 2019
    PubMed
    Summary

    Researchers developed an ultra-compact silicon waveguide device for efficient mode conversion. This dielectric metasurface coupler achieves 95.4% TE0-TE1 and 96.4% TE0-TE2 mode conversion, enabling advanced photonic applications.

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    Area of Science:

    • Photonics and Waveguide Technology
    • Metasurfaces and Nanophotonics

    Background:

    • Waveguide modes exhibit discrete characteristics crucial for optical device design.
    • The effective medium concept allows for the manipulation of light propagation in engineered structures.

    Purpose of the Study:

    • To design and demonstrate an ultra-compact, highly efficient mode conversion device.
    • To utilize a silicon waveguide platform for integrated photonic applications.

    Main Methods:

    • Co-directional coupler with periodic refractive index variation.
    • Dielectric metasurfaces engraved in a silicon waveguide.
    • Calculation of transverse index profile based on mode interference patterns.

    Main Results:

    • Achieved 95.4% conversion efficiency between TE0-TE1 modes over 8.91 μm.
    • Achieved 96.4% conversion efficiency between TE0-TE2 modes over 6.32 μm.
    • Demonstrated sinusoidal coupling coefficient behavior for constructive energy transfer.

    Conclusions:

    • The proposed device enables efficient mode conversion in silicon photonics.
    • Metasurface-based couplers offer a pathway to miniaturized and high-performance photonic integrated circuits.
    • Potential applications include dispersion compensation, wavelength division multiplexing, and sensing.