Near-Field Analysis of Bright and Dark Modes on Plasmonic Metasurfaces Showing Extraordinary Suppressed Transmission

Authors

  • Sabine Dobmann,

    Corresponding author
    1. Institute of Optics, Information and Photonics and Erlangen Graduate School in Advanced Optical Technologies, Friedrich-Alexander-University Erlangen-Nuremberg (FAU), Erlangen, Germany
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  • Arian Kriesch,

    1. Institute of Optics, Information and Photonics and Erlangen Graduate School in Advanced Optical Technologies, Friedrich-Alexander-University Erlangen-Nuremberg (FAU), Erlangen, Germany
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  • Daniel Ploss,

    1. Institute of Optics, Information and Photonics and Erlangen Graduate School in Advanced Optical Technologies, Friedrich-Alexander-University Erlangen-Nuremberg (FAU), Erlangen, Germany
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  • Ulf Peschel

    1. Institute of Optics, Information and Photonics and Erlangen Graduate School in Advanced Optical Technologies, Friedrich-Alexander-University Erlangen-Nuremberg (FAU), Erlangen, Germany
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Abstract

Plasmonic metasurfaces are investigated that consist of a sub-wavelength line pattern in an ultrathin (∼10 nm) silver film, designed for extraordinary suppressed transmission (EOST) in the visible spectral range. Measurements with a near-field scanning optical microscope (NSOM) demonstrate that far-field irradiation resonantly excites antenna-like (bright) modes that are localized on the metal ridges. The re-radiation of these modes into the far-field interferes destructively with the transmitted wave, thus suppressing transmission almost completely. In contrast, a second type of mode, bound (dark) surface plasmon polaritons (SPPs) launched from an NSOM tip, propagates well across the metasurface, preferentially perpendicular to the grating lines.

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