Large contrast enhancement of graphene monolayers by angle detection

Details Large contrast enhancement of graphene monolayers by angle detection Large contrast enhancement of graphene monolayers by angle detection

2009-06-22

arxiv.org/abs/0906.4056v1

Applied Physics Letters 95, 151904 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

3 pages, 6 figures

Scientific paper

10.1063/1.3247967

Exfoliated graphene monolayers are identified by optical inspection. In order to improve the monolayer detection, we investigate the angle dependence of the optical contrast of graphene on a 90nm SiO$_2$/Si substrate. We observe a significant enhancement of the visibility of graphene by changing the polarization and the angle of optical incidence. This method can be used to detect graphene on new substrate designs such as GaAs/AlAs based materials, which have a much cleaner surface.

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