Infrared nanoscopy of dirac plasmons at the graphene-SiO₂ interface.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 21972938.
- Also identified by DOI 10.1021/nl202362d.
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Abstract
We report on infrared (IR) nanoscopy of 2D plasmon excitations of Dirac fermions in graphene. This is achieved by confining mid-IR radiation at the apex of a nanoscale tip: an approach yielding 2 orders of magnitude increase in the value of in-plane component of incident wavevector q compared to free space propagation. At these high wavevectors, the Dirac plasmon is found to dramatically enhance the near-field interaction with mid-IR surface phonons of SiO(2) substrate. Our data augmented by detailed modeling establish graphene as a new medium supporting plasmonic effects that can be controlled by gate voltage.
Medical subject headings
- Graphite
- Models, Chemical
- Nanostructures
- Silicon Dioxide
- Surface Plasmon Resonance