Active and Ultrafast Terahertz Metamaterials

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. More and more terahertz system gradually become integration and miniaturization that we urgently need the active terahertz functional devices. Among these devices, tunability of transmission is desirable for many applications. In this paper, we report our recent development of nonlinear tunability and ultrafast dynamics from semiconductor Nb 5 N 6 metamaterials at THz region measured by intense THz pump THz probe system. Also, the temperature dependent nonlinearity is characterized.