Effects of edge on graphene plasmons as revealed by infrared nanoimaging.

ABSTRACT: We used scattering-type scanning near-field optical microscopy (s-SNOM) to investigate the plasmonic properties of edges in well-defined graphene nanostructures, including sharp tapers, nanoribbons and nanogaps, which were all fabricated via the growth-etching chemical vapor deposition (GECVD) method. The obtained near-field images revealed the localized plasmon modes along the graphene nanoribbon; these modes strongly depended on the size of the graphene pattern, the angle of the tapered graphene and the infrared excitation wavelength. These interesting plasmon modes were verified by numerical simulations and explained by the reflection, and interference of electromagnetic waves at the graphene-SiO₂ edge. The constructive interference at the graphene nanogap caused by charge ac

SUBMITTER: Xu Q 

PROVIDER: S-EPMC6062181 | biostudies-literature | 2017 Feb

REPOSITORIES: biostudies-literature