  The canalization of terahertz surface plasmon polaritons using a modulated
graphene monolayer is investigated for subwavelength imaging. An anisotropic
surface conductivity formed by a set of parallel nanoribbons with alternating
positive and negative imaginary conductivities is used to realize the
canalization regime required for hyperlensing. The ribbons are narrow compared
to the wavelength, and are created electronically by gating a graphene layer
over a corrugated ground plane. Good quality canalization of surface plasmon
polaritons is shown in the terahertz even in the presence of realistic loss in
graphene, with relevant implications for subwavelength imaging applications.
