Top: Images of a graphene wedge (bilayer region appears inside dotted line; single-layer region outside). Bottom: Single-layer graphene with a high density of grain boundaries and folds. The left column shows AFM topography images; middle and right columns show the amplitude and phase response of graphene plasmons by near-field interferometry, respectively.
From the article:
Phase-Resolved Surface Plasmon Interferometry of GrapheneJustin A. Gerber, Samuel Berweger, Brian T. O’Callahan, and Markus B. Raschke
Phys. Rev. Lett. 113, 055502 (2014)
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