Rayleigh Imaging of Graphene and Graphene Layers

Details Rayleigh Imaging of Graphene and Graphene Layers Rayleigh Imaging of Graphene and Graphene Layers

2007-05-18

arxiv.org/abs/0705.2645v1

Nano Lett. 7, 2711 (2007)

Physics

Condensed Matter

Materials Science

8 pages, 9 figures

Scientific paper

10.1021/nl071168m

We investigate graphene and graphene layers on different substrates by monochromatic and white-light confocal Rayleigh scattering microscopy. The image contrast depends sensitively on the dielectric properties of the sample as well as the substrate geometry and can be described quantitatively using the complex refractive index of bulk graphite. For few layers (<6) the monochromatic contrast increases linearly with thickness: the samples behave as a superposition of single sheets which act as independent two dimensional electron gases. Thus, Rayleigh imaging is a general, simple and quick tool to identify graphene layers, that is readily combined with Raman scattering, which provides structural identification.

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