Controlling Subnanometer Gaps in Plasmonic Dimers Using Graphene

Jan Mertens, Anna L. Eiden, Daniel O. Sigle, Fumin Huang, Antonio Lombardo, Zhipei Sun, Ravi S. Sundaram, Alan Colli, Christos Tserkezis, Javier Aizpurua, Silvia Milana, Andrea C. Ferrari, Jeremy J. Baumberg*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

177 Citations (Scopus)

Abstract

Graphene 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.

Original languageEnglish
Pages (from-to)5033-5038
Number of pages6
JournalNano Letters
Volume13
Issue number11
DOIs
Publication statusPublished - 24 Sep 2013

Keywords

  • Localized plasmons
  • dimer
  • graphene
  • field enhancement
  • nanoparticle
  • ENHANCED RAMAN-SCATTERING
  • GOLD NANOPARTICLES
  • SPECTROSCOPY
  • ELECTRODES
  • SURFACES
  • QUANTUM
  • REGIME
  • FILMS
  • SERS

Cite this