Regensburg 2010 – scientific programme
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O: Fachverband Oberflächenphysik
O 43: Graphene I
O 43.3: Talk
Wednesday, March 24, 2010, 11:00–11:15, H31
Absolute Raman Cross Section of Graphene — •Philipp Klar1, Robert Panknin1, Elefterios Lidorikis2, Andrea Carlo Ferrari3, Stephanie Reich1, and Cinzia Casiraghi1 — 1Institut für Experimentalphysik, Freie Universität Berlin — 2Engineering Department, University of Ioannina, Greece — 3Engineering department, Cambridge University, UK
Raman spectroscopy in graphitic systems is extremely interesting because it involves resonant conditions, defect-induced processes and because of strong electron-phonon coupling effects [1-3]. However, measurements of the absolute scattering cross section of graphite are rather scarce [4-5]. Here we measured the first- and second-order Raman spectrum of graphene and graphite using excitation energies covering the visible range, from 1.96 eV to 2.7 eV. By using the substitutional method, we have found that the G peak Raman cross section is ∼ 2 × 10−5 m−1 Sr−1 at 2.41 eV for both graphene and graphite, in agreement with Ref. 5. The 2D peak Raman cross section of graphene is ∼ 3 × 10−5 m−1 Sr−1 at 2.41 eV, well comparable with the one of the first order G peak. This confirms the resonant nature of the 2D peak [1-2].
1. C. Thomsen, S. Reich, PRL 85, 5214 (2000)
2. D. M. Basko, PRB, 78, 125418 (2008)
3. S. Piscanec et al, PRL 93, 185503 (2004)
4. K. Sinha, J. Menendez, PRB 41, 10845 (1990)
5. N. Wada, S. A. Solin, Physica 105B, 353 (1981)