Strained graphene as a local probe for plasmon-enhanced Raman scattering by gold nanostructures

Sebastian Heeg, Antonios Oikonomou, Roberto Fernandez Garcia, Stefan A. Maier, Aravind Vijayaraghavan, Stephanie Reich

Research output: Contribution to journalArticleResearchpeer-review

11 Citations (Scopus)

Abstract

We investigate with Raman spectroscopy how gold nanostructures of different shape, size and geometry locally modify a graphene cover layer through strain. The resulting phonon softening translates into frequency downshifts of up to 85 cm-1 for the 2D-mode of graphene. With spatially resolved and excitation dependent Raman measurements we demonstrate that the downshifted Raman peaks exclusively arise from strained graphene subject to plasmonic enhancement by the nanostructures. The signals arise from an area well below the size of the laser spot. They serve as a local probe for the interaction between graphene and intense light fields.

Original languageEnglish
Pages (from-to)1067-1070
Number of pages4
JournalPhysica Status Solidi: Rapid Research Letters
Volume7
Issue number12
DOIs
Publication statusPublished - Dec 2013
Externally publishedYes

Keywords

  • Graphene
  • Plasmons
  • Raman scattering
  • Strain

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