Active Control of Terahertz Waves by VO2 metamaterial

Recently, with the development of artificial electromagnetic medium, metamaterials offer people the ability to subjectively control electromagnetic wave and provide a promising solution for scarce terahertz (THz) functional devices. In this paper, we describe a method for the active control of terahertz (THz) waves using vanadium dioxide (VO
₂
)-embedded hybrid metamaterials (MMs). VO
₂
undergoes an insulator-metal phase transition at around 68°C, causing its conductivity to change by five orders of magnitude. Our MM shows that it can realize mode switching via the VO
₂
pads with high conductivity in the conduction state and high dynamic conductivity across the phase transition.