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    Researchers developed multi-layer metasurfaces using metallic slit pairs for terahertz surface wave devices. This innovation enables achromatic surface wave lenses and wavelength-division multiplexers, advancing multi-wavelength plasmonic circuit design.

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    Area of Science:

    • Terahertz technology
    • Plasmonics
    • Metasurface optics

    Background:

    • Metasurface devices for surface waves (SWs) at multiple wavelengths are of significant interest, particularly in terahertz (THz) research.
    • Designing such devices often faces challenges with frequency crosstalk and design complexity.

    Purpose of the Study:

    • To propose and demonstrate a novel multi-layer metasurface structure for multi-wavelength terahertz SW devices.
    • To overcome design complexities and frequency crosstalk in SW device development.

    Main Methods:

    • Utilized metallic slit pairs with narrow bandwidths, tunable by geometric parameters, to construct the multi-layer metasurface.
    • Employed near-field scanning terahertz microscopy (NSTM) for experimental validation.
    • Designed and implemented a wavelength-division multiplexer (WDM).

    Main Results:

    • Successfully demonstrated achromatic surface wave lenses (SWLs) operating at 0.6, 0.75, and 1 THz.
    • Implemented a functional wavelength-division multiplexer (WDM) for plasmonic circuits.
    • Showcased the ability to couple terahertz waves from free space to SWs and control their propagation.

    Conclusions:

    • The proposed metallic slit pair metasurface effectively suppresses frequency crosstalk, simplifying the design of multi-wavelength SW devices.
    • The demonstrated SWLs and WDM highlight the potential for advanced multiplexed plasmonic circuits.
    • This approach offers a promising pathway for developing multi-wavelength plasmonic metasurface devices applicable across various frequency ranges.