Frequency pulling and line-shape broadening in graphene Raman spectra by resonant Stokes surface plasmon polaritons

This Rapid Communication reports on the modulation of the position and linewidth of the G and 2D Raman bands for monolayer graphene through coupling to surface plasmon polaritons (SPPs). It is shown that gold nanoresonators tuned to the graphene Stokes emission frequency, not the laser pump, broaden...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2015-05, Vol.91 (20), Article 201408
Main Authors: Ghamsari, Behnood G., Olivieri, Anthony, Variola, Fabio, Berini, Pierre
Format: Article
Language:English
Subjects:
Condensed matter
Fluid flow
Frequency pulling
Graphene
Joining
Plasmons
Polaritons
Two dimensional
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Summary:This Rapid Communication reports on the modulation of the position and linewidth of the G and 2D Raman bands for monolayer graphene through coupling to surface plasmon polaritons (SPPs). It is shown that gold nanoresonators tuned to the graphene Stokes emission frequency, not the laser pump, broaden the G and 2D peaks and shift them to lower wave numbers, in addition to enhancing the Raman scattering cross section. The variation of the band displacement and broadening with the SPPs' frequency demonstrates a strongly dispersive phenomenon, ruling out chemical, mechanical, and thermal mechanisms. It is believed that strong graphene-SPP coupling is responsible for the frequency pulling and line-shape broadening.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.91.201408