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Efficient and broadband polarization conversion with the coupled metasurfaces.

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    Summary

    Coupled metasurfaces achieve efficient, broadband light polarization rotation using orthogonal plasmonic polarizers. This technology offers high conversion efficiency near telecom wavelengths, enabling compact polarization rotators.

    Area of Science:

    • Plasmonics
    • Metasurfaces
    • Optical engineering

    Background:

    • Coupled metasurfaces are composite plasmonic structures with multilayered designs.
    • Orthogonal plasmonic polarizers are a type of coupled metasurface system.
    • These systems can induce light transmission and 90-degree polarization rotation.

    Purpose of the Study:

    • To systematically explore the polarization rotation effect in coupled metasurfaces.
    • To investigate the efficiency and bandwidth of this effect, particularly in the near-infrared region.
    • To identify design principles for compact and high-performance polarization rotators.

    Main Methods:

    • Utilizing low-loss silver for metasurface fabrication.
    • Employing a propagating waveguide mode for device operation.

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  • Overlapping specific internal surface-plasmon modes ((2,0) and (1,1)) to achieve desired optical effects.

    • Main Results:

    • Achieved high conversion efficiency (>80%) near telecom wavelengths.
    • Demonstrated a maximal efficiency of 83% at 1340 nm with a 300 nm bandwidth.
    • Observed similar polarization rotation effects in the terahertz (THz) band.

    Conclusions:

    • Coupled metasurfaces offer a viable platform for efficient and broadband polarization rotation.
    • The demonstrated design principles are effective for near-infrared and THz applications.
    • The findings facilitate the development of compact, high-performance polarization rotators for optical systems.