CUED Publications database

Controlling Sub-nm Gaps in Plasmonic Dimers using Graphene

Mertens, J and Eiden, AL and Sigle, DO and Lombardo, A and Sun, Z and Sundaram, RS and Colli, A and Tserkezis, C and Aizpurua, J and Milana, S and Ferrari, AC and Baumberg, JJ (2013) Controlling Sub-nm Gaps in Plasmonic Dimers using Graphene.

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Abstract

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.

Item Type: Article
Uncontrolled Keywords: cond-mat.mes-hall cond-mat.mes-hall
Subjects: UNSPECIFIED
Divisions: Div B > Photonics
Depositing User: Cron job
Date Deposited: 16 Jul 2015 13:11
Last Modified: 02 Aug 2015 00:47
DOI: 10.1021/nl4018463