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    Vertically-oriented nanoparticle dimer based on focused plasmonic trapping. 
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    Vertically-oriented nanoparticle dimer based on focused plasmonic trapping.

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    Accepted version (4.762Mb)
    Volume
    24
    Pagination
    16052 - 16065
    DOI
    10.1364/OE.24.016052
    Journal
    Opt Express
    Issue
    14
    Metadata
    Show full item record
    Abstract
    We proposed a vertically-oriented dimer structure based on focused plasmonic trapping of metallic nanoparticle. Quantitative FDTD calculations and qualitative analysis by simplified dipole approximation revealed that localized surface plasmon coupling dominates in the plasmon hybridization, and the vertically-oriented dimer can effectively make use of the dominant longitudinal component of the surface plasmon virtual probe thus providing much stronger electric field in the gap. Furthermore, for practical application the top nanoparticle of the dimer can be replaced with an atomic force microscope tip which enables the precise control of the gap distance of the dimer. Therefore the proposed vertically-oriented dimer structure provides both the scanning capability and the extremely-high electrical field necessary for the high sensitivity Raman imaging.
    Authors
    Shen, Z; Su, L; Shen, Y-C
    URI
    http://qmro.qmul.ac.uk/xmlui/handle/123456789/13836
    Collections
    • Biomedical Engineering and Materials [153]
    Language
    eng
    Licence information
    “The final publication is available at https://www.osapublishing.org/oe/fulltext.cfm?uri=oe-24-14-16052&id=345384”
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