Controlling Sub-nm Gaps in Plasmonic Dimers using Graphene

Autor:	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.
Rok vydání:	2013
Předmět:	Condensed Matter - Mesoscale and Nanoscale Physics
Druh dokumentu:	Working Paper
DOI:	10.1021/nl4018463
Popis:	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. Comment: 4 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1305.5367 Zobrazit plný text záznamu View this record from Arxiv