Thermally Switchable Terahertz Metasurface Devices

Active modulating the wave front of terahertz (THz) radiation is highly required in coming THz wireless communication and THz high resolution imaging. Two kinds of active metasurface modulators for dynamically controlling the wavefront of THz radiation are designed and fabricated, based on the phase transition phenomena of vanadium dioxide film. When the environment temperature is higher than the phase transition temperature of vanadium dioxide, the modulators can transfer the x-polarization THz wave into y-polarization with desired phase and amplitude modulation, thus the wave front of the THz wave can be modulated. Experiment results demonstrate the validity of the proposed approach.