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    Area of Science:

    • Photonics and Nanotechnology
    • Optics and Light-Matter Interactions

    Background:

    • Subwavelength plasmonic waveguides guide light at the nanoscale but are inherently bidirectional.
    • Coupling light from the top/bottom surface typically results in equal sharing into two opposite propagation directions.

    Discussion:

    • This study demonstrates breaking the symmetry of light propagation in plasmonic waveguides.
    • Utilizes spin-orbital angular momentum transfer in waveguide bends with circularly polarized light.
    • Achieves polarization-switchable, unidirectional light propagation without external nano-antennas.

    Key Insights:

    • Predicts up to 94% of incoupled light can be directed into a single propagation channel.
    • Enables unidirectional propagation of highly localized optical energy beyond the diffraction limit.
    • Demonstrates polarization-tunable control over light direction.

    Outlook:

    • Opens new avenues for nanophotonic circuitry, routing, and sorting.
    • Potential applications in optical nanosensing and nano-optical trapping and manipulation.
    • Facilitates the development of advanced integrated photonic devices.