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Controlling subnanometer gaps in plasmonic dimers using graphene

AuthorsMertens, Jan; Tserkezis, C.; Aizpurua, Javier ; Ferrari, A. C.; Baumberg, Jeremy J.
Localized plasmons
Field enhancement
Issue Date2013
PublisherAmerican Chemical Society
CitationNano Letters 13(11): 5033-5038 (2013)
AbstractGraphene is used as the thinnest possible spacer between gold nanoparticles and a gold substrate. This creates a robust, repeatable, and stable subnanometer gap for massive plasmonic field enhancements. White light spectroscopy of single 80 nm gold nanoparticles reveals plasmonic coupling between the particle and its image within the gold substrate. While for a single graphene layer, spectral doublets from coupled dimer modes are observed shifted into the near-infrared, these disappear for increasing numbers of layers. These doublets arise from charger-transfer-sensitive gap plasmons, allowing optical measurement to access out-of-plane conductivity in such layered systems. Gating the graphene can thus directly produce plasmon tuning. © 2013 American Chemical Society.
Identifiersdoi: 10.1021/nl4018463
issn: 1530-6984
e-issn: 1530-6992
Appears in Collections:(CFM) Artículos
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