Spatial Coherence in Near-Field Raman Scattering

作     者：Ryan Beams Luiz Gustavo Cançado Sang-Hyun Oh Ado Jorio Lukas Novotny 

作者机构：Institute of Optics University of Rochester Rochester New York 14627 USA Departamento de Física Universidade Federal de Minas Gerais Belo Horizonte MG 30123-970 Brazil Department of Electrical and Computer Engineering University of Minnesota Minneapolis Minnesota 55455 USA Photonics Laboratory ETH Zürich 8093 Zürich Switzerland* 

出 版 物：《Physical Review Letters》 (Phys Rev Lett)

年 卷 期：2014年第113卷第18期

页      面：186101-186101页

核心收录：

学科分类：07[理学] 0702[理学-物理学] 

基　　金：Swiss National Science Foundation, (200021-149433) U.S. Department of Energy, (DE-FG02-05ER46207) Schweizerischer Nationalfonds zur Fö rderung der Wissenschaftlichen Forschung, SNF, (149433) Schweizerischer Nationalfonds zur Fö rderung der Wissenschaftlichen Forschung, SNF 

主　　题：RAMAN scattering LIGHT -- Scattering CRYSTALS SPECTRUM analysis GRAPHENE PHONONS 

摘      要：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.