Abstract
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 ${{\rm VO}_2}$ and graphene. The metasurfaces act as transmittive (reflective) beamsplitters for the dielectric (metallic) phase of ${{\rm VO}_2}$ 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.
© 2021 Optical Society of America
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