Spatial coherence in near-field Raman scattering.
- Beams R Institute of Optics, University of Rochester, Rochester, New York 14627, USA.
- Cançado LG Departamento de Física, Universidade Federal de Minas Gerais, Belo Horizonte, MG 30123-970, Brazil.
- Oh SH Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, Minnesota 55455, USA.
- Jorio A Departamento de Física, Universidade Federal de Minas Gerais, Belo Horizonte, MG 30123-970, Brazil.
- Novotny L Photonics Laboratory, ETH Zürich, 8093 Zürich, Switzerland*
- 2014-11-15
Published in:
- Physical review letters. - 2014
English
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 ∼30 nm for the optical phonons in graphene, the results varying with vibrational symmetries and spatial confinement of the phonons.
- Language
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- English
- Open access status
- hybrid
- Identifiers
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- DOI 10.1103/PhysRevLett.113.186101
- PMID 25396381
- Persistent URL
- https://sonar.ch/global/documents/40614
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