Multifunctional tunable gradient metasurfaces for terahertz beam splitting and light absorption

Obtaining functional devices with tunable features is beneficial to advance terahertz (THz) science and technology. Here, we propose multifunctional gradient metasurfaces that are composed of a periodic array of binary Si microcylinders integrated with VO2 and graphene. The metasurfaces act as transmittive (reflective) beamsplitters for the dielectric (metallic) phase of VO2 with a switchable characteristic. Moreover, by integrating the metasurfaces with graphene and modifying its chemical potential, one can tune the intensity of the split beam as well as obtain nearly perfect resonant absorptions. Consequently, the proposed metasurfaces can find potential applications in THz interferometers, multiplexers, and light absorbers. (C) 2021 Optical Society of America

Automated summary

The proposed multifunctional gradient metasurfaces, composed of binary Si microcylinders integrated with VO2 and graphene, can advance THz science and technology by providing tunable features. These metasurfaces act as transmittive or reflective beamsplitters for VO2 and can be used in THz interferometers, multiplexers, and light absorbers.