Tunable and switchable multi-functional terahertz metamaterials based on a hybrid vanadium dioxide–graphene integrated configuration
Bin Tang, Yi Ren
Abstract
is transited from the isolating state to the conducting state, the metamaterial does not only exhibit a linear dichroism response but also perform linear-to-linear and linear-to-circular polarization conversions simultaneously. Specifically, the designed device behaves like a half-wave plate, where a linear polarization conversion ratio exceeds 96.5% at a frequency of 9.17 THz. Meanwhile, it acts as a quarter-wave plate which can convert the linear polarization light into left-handed and right-handed circularly polarized lights with high efficiencies at frequencies of 9.04 and 9.3 THz, respectively. Moreover, the performance of the designed structure can be actively controlled by adjusting the geometrical parameters and Fermi energy of graphene. This work provides a new avenue in developing multi-functional terahertz metamaterial devices.