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    Gold dimer nanoantenna with slanted gap for tunable LSPR and improved SERS

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    Type
    Article
    Authors
    Kessentini, Sameh
    Barchiesi, Dominique
    D'Andrea, Cristiano
    Toma, Andrea
    Guillot, Nicolas
    Di Fabrizio, Enzo M. cc
    Fazio, Barbara
    Maragó, Onofrio M.
    Gucciardi, Pietro Giuseppe
    Lamy De La Chapelle, Marc L.
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2014-02-03
    Online Publication Date
    2014-02-03
    Print Publication Date
    2014-02-13
    Permanent link to this record
    http://hdl.handle.net/10754/563393
    
    Metadata
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    Abstract
    We focus on improving the surface-enhanced Raman scattering (SERS) of dimer nanoantenna by tailoring the shape of the coupled nanoantennas extremities from rounded to straight or slanted ones. A numerical model based on the discrete dipole approximation method-taking into account periodicity, adhesion layer, and roughness-is first validated by comparison with localized surface plasmon resonance (LSPR) and SERS experiments on round-edged dimer nanoantennas and then used to investigate the effect of the straight or slanted gap in the dimer antenna. Simulations show that both LSPR and SERS can be tuned by changing the gap slanting angle. The SERS enhancement factor can also be improved by 2 orders of magnitude compared to the one reached using a rounded gap. Therefore, the slanting angle can be used as a new control parameter in the design of SERS substrates to guarantee stronger field confinement and higher sensitivity, especially as its feasibility is demonstrated. © 2014 American Chemical Society.
    Citation
    Kessentini, S., Barchiesi, D., D’Andrea, C., Toma, A., Guillot, N., Di Fabrizio, E., … Lamy de la Chapelle, M. (2014). Gold Dimer Nanoantenna with Slanted Gap for Tunable LSPR and Improved SERS. The Journal of Physical Chemistry C, 118(6), 3209–3219. doi:10.1021/jp409844y
    Sponsors
    The authors thank the Nanoantenna European Project (FP7 Health-F5-2009-241818), the Region Champagne-Ardennes, the Conseil Regional de l'Aube, and MIUR (Project PRIN 2008J858Y7 and Programma Operativo Nazionale Ricerca e Competitivita 2007-2013, PON01_01322 PANREX) for financial support.
    Publisher
    American Chemical Society (ACS)
    Journal
    The Journal of Physical Chemistry C
    DOI
    10.1021/jp409844y
    ae974a485f413a2113503eed53cd6c53
    10.1021/jp409844y
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program

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