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    Researchers developed a novel nanostructure for efficient surface plasmon excitation and cross-coupling in thin metal films. This innovation enables advanced surface plasmon resonance biosensing without complex optical setups.

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    Area of Science:

    • Nanophotonics
    • Plasmonics
    • Biosensing

    Background:

    • Surface plasmons (SPs) are collective electron oscillations at metal-dielectric interfaces.
    • Efficient excitation and manipulation of SPs are crucial for advanced optical devices.
    • Existing methods for SP excitation often require specialized optical configurations like high refractive index prisms.

    Purpose of the Study:

    • To introduce a multi-diffractive nanostructure for resonant excitation and cross-coupling of surface plasmons.
    • To enable direct optical probing of surface plasmon resonance (SPR) through the substrate.
    • To demonstrate the utility of this nanostructure in biosensing applications.

    Main Methods:

    • Fabrication of a multi-diffractive nanostructure with superimposed periodic corrugations using UV-nanoimprint lithography.
    • Experimental investigation of diffraction-excited surface plasmons and their cross-coupling via Bragg scattering.
    • Characterization of the nanostructure's performance using refractometric and biomolecular affinity binding studies.

    Main Results:

    • The nanostructure successfully excites and cross-couples surface plasmons through a thin metallic film.
    • Established cross-coupled Bragg-scattered surface plasmon modes with localized electromagnetic fields on both interfaces.
    • Demonstrated SPR biosensing capabilities without the need for prism coupling.

    Conclusions:

    • The reported multi-diffractive nanostructure offers an efficient platform for SPR biosensing.
    • Mass-producible via UV-nanoimprint lithography, making it suitable for commercial applications.
    • Eliminates the need for high refractive index prisms, simplifying optical interrogation in biosensing assays.