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Título

Strong plasmon reflection at nanometer-size gaps in monolayer graphene on SiC

AutorNesterov, M. L.; Nikitin, A. Yu; Slipchenko, Tetiana M.; Martín-Moreno, Luis; García de Abajo, Francisco Javier ; Hillenbrand, Rainer
Palabras claveGraphene
Plasmon reflection
SiC
Graphene plasmons
s-SNOM
Near-field microscopy
Fecha de publicación2013
EditorAmerican Chemical Society
CitaciónNano Letters 13(12): 6210-6215 (2013)
ResumenWe employ tip-enhanced infrared near-field microscopy to study the plasmonic properties of epitaxial quasi-free-standing monolayer graphene on silicon carbide. The near-field images reveal propagating graphene plasmons, as well as a strong plasmon reflection at gaps in the graphene layer, which appear at the steps between the SiC terraces. When the step height is around 1.5 nm, which is two orders of magnitude smaller than the plasmon wavelength, the reflection signal reaches 20% of its value at graphene edges, and it approaches 50% for step heights as small as 5 nm. This intriguing observation is corroborated by numerical simulations and explained by the accumulation of a line charge at the graphene termination. The associated electromagnetic fields at the graphene termination decay within a few nanometers, thus preventing efficient plasmon transmission across nanoscale gaps. Our work suggests that plasmon propagation in graphene-based circuits can be tailored using extremely compact nanostructures, such as ultranarrow gaps. It also demonstrates that tip-enhanced near-field microscopy is a powerful contactless tool to examine nanoscale defects in graphene. © 2013 American Chemical Society.
Descripciónet al.
URIhttp://hdl.handle.net/10261/117874
DOI10.1021/nl403622t
Identificadoresdoi: 10.1021/nl403622t
issn: 1530-6984
e-issn: 1530-6992
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