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Cover Picture: Strained graphene as a local probe for plasmon‐enhanced Raman scattering by gold nanostructures (Phys. Status Solidi RRL 12/2013)
Author(s) -
Heeg Sebastian,
Oikonomou Antonios,
Fernandez Garcia Roberto,
Maier Stefan A.,
Vijayaraghavan Aravind,
Reich Stephanie
Publication year - 2013
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Reports
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201370470
Subject(s) - graphene , plasmon , raman spectroscopy , materials science , raman scattering , excitation , optoelectronics , phonon , optics , nanotechnology , condensed matter physics , physics , quantum mechanics
In their Letter on pp. 1067–1070 , Heeg et al. establish the general use of strained graphene as a local probe for plasmon‐enhanced Raman spectroscopy. The cover picture shows a sheet of graphene covering gold nanoantennas. Laser beams probe the Raman signal of graphene subject to enhanced light fields originating from the antenna cavities and next to them. The structures induce strain in the graphene layer. Strain shifts the phonon frequencies of graphene. As a result, vibrations at the plasmonic hotspot in the cavities differ in energy from vibrations in other areas and serve as a local probe. The authors report shifts of up to 85 cm –1 of the 2D Raman mode of graphene for plasmonic structures of varying size, geometry and composition. Excitation energy dependent and spatial Raman mapping show that enhanced Raman signals exclusively arise from strained graphene. The shifted vibrations represent the equivalent of a spatial resolution smaller than the wavelength of the excitation; they allow to study the interplay of external pertubations like doping, electric‐ and magnetic fields and enhanced light fields in graphene.