Year: 2013
Type: article
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.
Source: Nano Letters
DOI: 10.1021/nl4018463
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: Cucurbitrils for Hardwired Optical and Electronic Self-assembly, Graphene Flexible Electronics and Optoelectronics, Soft NanoPhotonics Programme Grant (sNaP), Programmable nano-assembly of plasmonic materials for molecular interactions, Graphene Flexible Electronics and Optoelectronics: Bridging The Gap Between Academia and Industry, Non-equilibrium and relaxation phenomena in graphene-based devices
OpenAlex ID: W2157055089