Researchers from the University of California have used a beam of infrared light to send ripples of electrons along the surface of graphene. The length of heights of the plasmons oscillations can be controlled using a simple electrical circuit.
It was already suspected that plasmons will be present on graphene, but this is the first real demonstration. The actual device used is a sheet of graphene on a silicon dioxide chip.
Plasmons could be used to transmit information, within far tighter spaces compared to light (i.e. at nanometer scales).
The researchers used high quality graphene produced by Graphenea.