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Strained graphene as a local probe for plasmon‐enhanced Raman scattering by gold nanostructures |
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| Authors: | Sebastian Heeg Antonios Oikonomou Roberto Fernandez Garcia Stefan A Maier Aravind Vijayaraghavan Stephanie Reich |
| Institution: | 1. Department of Physics, Freie Universit?t Berlin, 14195 Berlin, Germany;2. School of Computer Science, University of Manchester, Manchester M13 9PL, U.K.;3. Centre for Mesoscience and Nanotechnology, University of Manchester, Manchester M13 9PL, U.K.;4. Department of Physics, Imperial College London, London SW7 2AZ, U.K.;5. School of Materials, University of Manchester, Manchester M13 9PL, U.K. |
| 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. (© 2013 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) |
| Keywords: | plasmons Raman scattering graphene strain |