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Ultra-small wavelength splitters in a subwavelength plasmonic waveguide.

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    Researchers developed an ultra-small plasmonic wavelength splitter for integrated photonic circuits. This device uses anti-phase interference in a double-slit aperture to split surface plasmon polaritons (SPPs) by wavelength.

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    Area of Science:

    • Plasmonics
    • Nanophotonics
    • Integrated Optics

    Background:

    • Miniaturizing optical devices is crucial for high-integration photonic circuits.
    • Subwavelength structures are key to overcoming diffraction limits in optical devices.

    Purpose of the Study:

    • To realize an ultra-small plasmonic wavelength splitter.
    • To enable wavelength splitting of surface plasmon polaritons (SPPs) in opposite directions.

    Main Methods:

    • Fabrication of a double-slit aperture with varying slit widths in a subwavelength plasmonic waveguide.
    • Experimental realization and characterization of the plasmonic wavelength splitter.

    Main Results:

    • An ultra-small plasmonic wavelength splitter with a footprint of ~1.4 μm² was achieved.
    • Anti-phase interference between SPPs due to different slit widths enabled wavelength-dependent directional propagation.
    • Splitting wavelengths and separation are tunable via structural parameter adjustments.

    Conclusions:

    • The developed device offers a novel approach for wavelength splitting in highly integrated plasmonic circuits.
    • The tunable nature and small footprint make it suitable for optical modulating, sensing, and computing applications.