Switchable cylindrical hyperlens for THz range

The development of metamaterials with the ability to tune the material dispersion has led to impressive advances in the diverse field of plasmonics and photonics. Of interest to many is the ability to manipulate and recognize images on subwavelength scales. Active hyperbolic metamaterials can bring possible solutions to achieve high-resolution images by creating hyperlenses in real-time. We propose the design of alternating metal/dielectric multilayer-based cylindrical hyperlens including several layers of graphene for switchable far-field sub-diffraction imaging at terahertz frequencies. Simulation results by the finite-element method demonstrate that by changing the external electric field of graphene layers we can fully suppress the propagation of the evanescent waves in hyperlens. The proposed hyperlens has the advantage of operating in a wideband region due to the tunability of graphene’s dielectric permittivity in several layers enabling the potential applications in real-time super-resolution imaging and sensing.