  Graphene plasmonic nanostructures enable subwavelength confinement of
electromagnetic energy from the mid-infrared down to the terahertz frequencies.
By exploiting the spectrally varying light scattering phase at vicinity of the
resonant frequency of the plasmonic nanostructure, it is possible to control
the angle of reflection of an incoming light beam. We demonstrate, through
full-wave electromagnetic simulations based on Maxwell equations, the
electrical control of the angle of reflection of a mid-infrared light beam by
using an aperiodic array of graphene nanoribbons, whose widths are engineered
to produce a spatially varying reflection phase profile that allows for the
construction of a far-field collimated beam towards a predefined direction.
