Subwavelength imaging amplification via electro-thermally tunable InSb-graphene-based hyperlens in terahertz frequency

Abstract

Subwavelength imaging plays an important role in various fields of science and technology. We propose a electro-thermally tunable hyperlens design featuring alternating graphene/metal/dielectric layers that enables subdiffraction far-field imaging with real-time amplification capabilities at terahertz frequencies. We show that one layer of graphene is able to increase the intensity of the subwavelength image of the hyperlens radiation in the near and far zones by tuning its chemical potential by the applied voltage. The proposed hyperlens is dynamically tunable with temperature changes over a wide frequency range. Simultaneous or independent electro-thermal tunability of the hyperlens opens new multifunctional possibilities for light manipulation. This improves the quality of subwavelength images for new devices in the terahertz range.