Journal
PHYSICAL REVIEW X
Volume 4, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevX.4.031054
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Funding
- U.S. Department of Energy [DE-FG02-05ER46207]
- Swiss National Science Foundation [200021_149433]
- CNPq
- FAPEMIG
- CAPES
- U.S. Department of Energy (DOE) [DE-FG02-05ER46207] Funding Source: U.S. Department of Energy (DOE)
- Swiss National Science Foundation (SNF) [200021_149433] Funding Source: Swiss National Science Foundation (SNF)
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A theoretical study describing the coherence properties of near-field Raman scattering in two-and one-dimensional systems is presented. The model is applied to the Raman modes of pristine graphene and graphene edges. Our analysis is based on the tip-enhanced Raman scheme, in which a sharp metal tip located near the sample surface acts as a broadband optical antenna that transfers the information contained in the spatially correlated (but nonpropagating) near field to the far field. The dependence of the scattered signal on the tip-sample separation is explored, and the theory predicts that the signal enhancement depends on the particular symmetry of a vibrational mode. The model can be applied to extract the correlation length L-c of optical phonons from experimentally recorded near-field Raman measurements. The coherence properties of optical phonons have been broadly explored in the time and frequency domains, and the spatially resolved approach presented here provides a complementary methodology for the study of local material properties at the nanoscale.
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