Spatial coherence in near-field Raman scattering

Ryan Beams, Luiz Gustavo Cançado, Sang Hyun Oh, Ado Jorio, Lukas Novotny

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63 Scopus citations


Inelastic light scattering in crystals has historically been treated as a spatially incoherent process, giving rise to incoherent optical radiation. Here we demonstrate that Raman scattering can be spatially coherent, in which case it depends on the dimensionality and symmetry of the scatterer. Using near-field spectroscopy, we measure a correlation length of ∼30nm for the optical phonons in graphene, the results varying with vibrational symmetries and spatial confinement of the phonons.

Original languageEnglish (US)
Article number186101
JournalPhysical review letters
Issue number18
StatePublished - Oct 28 2014

Bibliographical note

Publisher Copyright:
© 2014 American Physical Society.


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