Enhanced nanoplasmonic optical sensors with reduced substrate effect

Alexandre Dmitriev, Carl Hägglund, Si Chen, Hans Fredriksson, Tavakol Pakizeh, Mikael Käll, Duncan S Sutherland

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    Abstract

    We present a straightforward method to double the refractive index sensitivity of surface-supported nanoplasmonic optical sensors by lifting the metal nanoparticles above the substrate by a dielectric nanopillar. The role of the pillar is to substantially decrease the spatial overlap between the substrate and the enhanced fields generated at plasmon resonance. Data presented for nanodisks and nanoellipsoids supported by pillars of varying heights are found to be in excellent agreement with electrodynamics simulations. The described concepts apply to multitude of plasmonic nanostructures, fabricated by top-down or bottom-up techniques, and are likely to further facilitate the development of novel nanooptical sensors for biomedicine and diagnostics.
    Original languageEnglish
    JournalNano Letters
    Volume8
    Issue11
    Pages (from-to)3893-8
    Number of pages6
    ISSN1530-6984
    DOIs
    Publication statusPublished - 1 Nov 2008

    Keywords

    • Microscopy, Electron, Scanning
    • Nanostructures
    • Sensitivity and Specificity
    • Silicon Dioxide
    • Surface Plasmon Resonance
    • Surface Properties

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