Journal
NANO LETTERS
Volume 13, Issue 11, Pages 5033-5038Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl4018463
Keywords
Localized plasmons; dimer; graphene; field enhancement; nanoparticle
Categories
Funding
- U.K. EPSRC [EP/G060649/1, EP/G037221/1, EP/H007024/1, EP/G042357/1, EP/K01711X/1, EP/K017144/1,]
- ERG LINASS [320503]
- NANOPOTS
- Nokia Research Centre
- Royal Society Wolfson Research Merit Award
- EU Grants RODIN
- GENIUS
- CareRAMM
- Graphene Flagship [CNECT-ICT-604391]
- Spanish Ministry of Science and Education [FIS2010-19609-CO2-01]
- Basque Government [IT756-13]
- Engineering and Physical Sciences Research Council [EP/K028510/1, EP/G060649/1, EP/H007024/1, EP/K01711X/1, EP/K017144/1, EP/G042357/1] Funding Source: researchfish
- EPSRC [EP/K017144/1, EP/G042357/1, EP/H007024/1, EP/K01711X/1, EP/K028510/1, EP/G060649/1] Funding Source: UKRI
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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.
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