Metamaterials based on the phase transition of VO2

In this article, we present a comprehensive review on recent research progress on design and fabrication of active tunable metamaterials devices based on phase transition of VO 2 . Firstly, we provide an introduction regarding mechanisms of metal-to-insulator phase transition (MIPT) in VO 2 investigated by ultrafast THz spectroscopies. By analyzing the THz spectra, the processes evolutions of MIPT in VO 2 induced by different external excitations are described. The superiorities of using VO 2 as building blocks to construct highly tunable metamaterials are discussed.