Dynamically adjustable asymmetric transmission and polarization conversion for linearly polarized terahertz wave**Project supported by the National Natural Science Foundation of China (Grant Nos. 11574059 and 61965005), the National Technology Major Special Project, China (Grant No. 2017ZX02101007-003), the Natural Science Foundation of Guangxi Zhuang Autonomous Region, China (Grant No. 2018GXNSFAA050043), and the Guangxi Special Expert Program and Innovation Project of Guangxi

Abstract

The asymmetric transmission (AT) and polarization conversion of terahertz (THz) wave play a vital role in future THz communication, spectrum, and information processing. Generally, it is very difficult and complicated to actively control the AT of electromagnetic (EM) wave by using traditional devices. Here, we theoretically demonstrate a stereo-metamaterial (stereo-MM) consisting of a layer of metal structure and a layer of phase transition structure with a polyimide spacer in between. The performance of the device is simulated by using the finite-integration-technology (FIT). The results show that the AT and polarization conversion of linearly polarized wave can be dynamically controlled in a range of 1.0 THz–1.6 THz when the conductivity σ of vanadium dioxide (VO2) is changed under the external stimulation. This study provides an example of actively controlling of the AT and polarization conversion of the EM wave.