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Highly efficient singular surface plasmon generation by achiral apertures.

Quanbo Jiang, Aline Pham, Serge Huant

    Optics Letters
    |October 18, 2016
    PubMed
    Summary
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    Researchers efficiently generated singular surface plasmon (SP) fields using Λ-shaped apertures. Tuning the aperture

    Area of Science:

    • Nanophotonics
    • Plasmonics
    • Optical Physics

    Background:

    • Surface plasmons (SPs) are crucial for nanoscale light manipulation.
    • Generating and controlling SP fields, particularly singularities, is a key challenge in nanophotonics.

    Purpose of the Study:

    • To demonstrate highly efficient generation of singular surface plasmon (SP) fields.
    • To investigate the tunability of SP generation using achiral plasmonic structures.
    • To explore applications in optical focusing and vortex generation.

    Main Methods:

    • Utilized achiral plasmonic structures with Λ-shaped apertures.
    • Employed quantitative analysis with leakage radiation microscopy (LRM).
    • Varied the apex angle of the Λ-shaped apertures to tune spin-orbit coupling.

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    Related Experiment Videos

    Last Updated: Mar 13, 2026

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    Main Results:

    • Achieved highly efficient generation of singular surface plasmon (SP) fields.
    • Demonstrated tunable spin-orbit coupling by adjusting the apex angle.
    • A 60° apex angle Λ-shaped aperture array yielded directional coupling efficiency.
    • A ring of 60° apex angle Λ-shaped apertures achieved a maximum extinction ratio (ER=11) for SP singularities.

    Conclusions:

    • Λ-shaped apertures offer an efficient method for generating tunable SP singularities.
    • The optimized design provides a pathway for enhanced SP focusing and vortex generation.
    • This work advances the development of nanophotonic devices for applications like optical tweezers.