A Tunable Multifunctional Terahertz Asymmetric Transmission Device Hybrid With Vanadium Dioxide Blocks

A tunable multifunctional terahertz metamaterial asymmetric transmission device is proposed. The device is composed of three layers from top to bottom, i.e., Ge–SiO 2 –Ge. The germanium layer with a VO 2 block enables it to work in two operating modes by controlling the state of the VO 2 blocks, thereby flexibly realizing asymmetric forward and backward transmission with specific polarization. The device is endowed with a more flexible design of electromagnetic systems, rendering it suitable for applications in polarization converters, polarization filters, and other polarization modulators.