Journal
NANO LETTERS
Volume 8, Issue 12, Pages 4270-4274Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl8017498
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Funding
- Korea Research Foundation [KRF-2007-314-C00093]
- Korea Science and Engineering Foundation (KOSEF) [R01-2007-000-10654-0]
- MEST [2008-03717, R0A-2008-000-20052-0]
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Spatially resolved and polarized micro-Raman spectroscopy on microcrystalline graphene shows strong polarization dependences of double-resonance Raman intensities. The Raman intensity of the double-resonant 2D band is maximum when the excitation and detection polarizations are parallel and minimum when they are orthogonal, whereas that of the G band is isotropic. A calculation shows that this strong polarization dependence is a direct consequence of inhomogeneous optical absorption and emission mediated by electron-phonon interactions involved in the second-order Stokes-Stokes Raman scattering process.
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