Controlling Sub-nm Gaps in Plasmonic Dimers using Graphene

Graphene is used as the thinnest possible spacer between gold nanoparticles and a gold substrate. This creates a robust, repeatable, and stable sub-nanometre gap for massive plasmonic field enhancements. White light spectroscopy of single 80 nm gold nanoparticles reveals plasmonic coupling between t...

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Published inarXiv.org
Main Authors Mertens, Jan, Eiden, Anna L, Sigle, Daniel O, Lombardo, Antonio, Sun, Zhipei, Sundaram, Ravi S, Colli, Alan, Tserkezis, Christos, Aizpurua, Javier, Milana, Silvia, Ferrari, Andrea C, Baumberg, Jeremy J
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 23.05.2013
Subjects
Charge transfer
Coupled modes
Dimers
Gold
Graphene
Nanoparticles
Optical measurement
Physics - Mesoscale and Nanoscale Physics
Substrates
White light
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Summary:Graphene is used as the thinnest possible spacer between gold nanoparticles and a gold substrate. This creates a robust, repeatable, and stable sub-nanometre 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 infra-red, these disappear for increasing numbers of layers. These doublets arise from plasmonic charge transfer, allowing the direct optical measurement of out-of-plane conductivity in such layered systems. Gating the graphene can thus directly produce plasmon tuning.
ISSN:2331-8422
DOI:10.48550/arxiv.1305.5367