Switchable five-function terahertz metasurface based on graphene and vanadium dioxide with single-sized nanostructure.

Driven by the need for miniaturization and integration, incorporating multiple functions into a single metasurface based on hybridized tunable materials is particularly demanding in the terahertz (THz) range. However, existing hybrid material metasurfaces either need to change their sizes or cannot fully explore their design potential, particularly failing to integrate both near-field and far-field functions into a single metasurface, which restricts the development and application of terahertz metasurface devices. In this paper, combing with graphene and vanadium dioxide (VO₂), a multifunctional terahertz metasurface is designed with only a single-sized nanostructure, which can achieve five-functional switchable and integration. As a proof, the simulated metasurface can similarly be as a polarization conversion device, a broadband modulation device and an absorption-device, and more importantly, it can also realize the functions of the near-field nanoprinting imaging 'A' and far-field holographic imaging 'B'. The introduction of multiple tunable materials into a single terahertz metasurface and the simultaneous integration of the near- and far-field functions provide a new design platform for tunable multifunctional devices, which can contribute to the development of miniaturization and integration of terahertz devices.