Polarization properties provide a controlled degree of freedom in the process of light propagation. Efficiently manipulating polarization states plays a pivotal role in the areas of electromagnetic wave detection and information communication. In this work, we propose a chiral metamaterial that is comprised of an array of 90°-twisted E-shaped resonators with incorporated vanadium dioxide films. The hybridized chiral metamaterial allows us to effectively modify the conductivity of vanadium dioxide utilizing a thermal trigger. A thermo-controlled cross-polarization conversion can be realized. The phase transition metamaterials may open an opportunity in the THz regime to acquire a variety of functionalities, such as tunable filters, modulators and switches.
We present an optically controlled terahertz (THz) switch to tune the state of polarization based on single-layer chiral metamaterial. The chiral metamaterial consists of an array of perforated S-shaped slits with incorporated photoactive silicon, which allows us to control dynamically cross-polarization transmission. The switch state can be efficiently controlled by external optical stimuli. The realization of cross-polarization THz switch in a single-layer metamaterial has simple structure design and easy fabrication and therefore the S-shaped metamaterial will be a promising candidate for polarization control devices.