Strong polarization dependence of double-resonant Raman intensities in graphene.
basic_science · Level V
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- Record sourced from PubMed, PMID 19368002.
- Also identified by DOI 10.1021/nl8017498.
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Abstract
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.