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    Imaging the Hidden Modes of Ultrathin Plasmonic Strip Antennas by Cathodoluminescence

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    Type
    Article
    Authors
    Barnard, Edward S.
    Coenen, Toon
    Vesseur, Ernst Jan R.
    Polman, Albert
    Brongersma, Mark L.
    KAUST Grant Number
    KUS-C1-015-21
    Date
    2011-10-12
    Permanent link to this record
    http://hdl.handle.net/10754/598558
    
    Metadata
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    Abstract
    We perform spectrally resolved cathodoluminescence (CL) imaging nanoscopy using a 30 keV electron beam to identify the resonant modes of an ultrathin (20 nm), laterally tapered plasmonic Ag nanostrip antenna. We resolve with deep-subwavelength resolution four antenna resonances (resonance orders m = 2-5) that are ascribed to surface plasmon polariton standing waves that are confined on the strip. We map the local density of states on the strip surface and show that it has contributions from symmetric and antisymmetric surface plasmon polariton modes, each with a very different mode index. This work illustrates the power of CL experiments that can visualize hidden modes that for symmetry reasons have been elusive in optical light scattering experiments. © 2011 American Chemical Society.
    Citation
    Barnard ES, Coenen T, Vesseur EJR, Polman A, Brongersma ML (2011) Imaging the Hidden Modes of Ultrathin Plasmonic Strip Antennas by Cathodoluminescence. Nano Lett 11: 4265–4269. Available: http://dx.doi.org/10.1021/nl202256k.
    Sponsors
    The authors would like to thank Ragip A. Pala for assistance in preparation of the samples used in this work. The Stanford part of this work is supported by the Center for Advanced Molecular Photovoltaics (Award No KUS-C1-015-21), made by King Abdullah University of Science and Technology (KAUST). CL experiments were performed at AMOLF and are part of the research program of FOM that is financially supported by NWO. Work at AMOLF is also supported by NanoNextNL, a nanotechnology program of the Dutch Ministry of Economic Affairs. It is also part of the research program “Microscopy and modification of nanostructures with focused electron and ion beams” that is cofinanced by FEI Company.
    Publisher
    American Chemical Society (ACS)
    Journal
    Nano Letters
    DOI
    10.1021/nl202256k
    PubMed ID
    21879729
    ae974a485f413a2113503eed53cd6c53
    10.1021/nl202256k
    Scopus Count
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