Abstract
Vanadium dioxide (VO2) is a temperature phase change material that has metallic properties at high temperatures and insulation properties at room temperature. In this article, a novel device has been designed based on the dielectric metasurface consisting of VO2 and graphene array, which can achieve multiple functions by adjusting temperature and voltage. When the temperature is high (340 K), the device is in the absorption state and its absorptivity can be dynamically controlled by changing the temperature. On the other hand, the device is in the polarization state under room temperature, and the polarization of electromagnetic waves can be dynamically controlled by adjusting the voltage of graphene. This device can achieve a broadband absorber (the maximum absorptance reaches 99.415% at wavelengths ranging from 44 THz to 52 THz) and high polarization conversion efficiency (>99.89%) in the mid-infrared range, which has great advantages over other single-function devices. Our results demonstrate that this multifunctional device may have widespread applications in emitters, sensors, spatial light modulators, IR camouflages, and can be used in thermophotovoltaics and wireless communication.
Highlights
With the development of phase change materials, it has been found that the optical properties of VO2 phase change material change with temperature
The polarization of the electromagnetic wave is realized and the proposed device is capable of rotating a linear polarization state into its orthogonal one by tuning the Fermi level of graphene in the hybrid metamaterial
We demonstrate a polarization based on graphene
Summary
With the development of phase change materials, it has been found that the optical properties of VO2 phase change material change with temperature. A hybrid metamaterial based on VO2 and graphene is designed to achieve perfect absorption and polarization conversion function simultaneously. Guo et al realized the ultra-broadband infrared metasurface absorber by adopting multi metallic layers, but their work cannot accomplish tunability [21]. These proposed structures can only be tuned by changing geometric parameters of the structures. In low temperature conditions (e.g., room temperature 300 K), VO2 is at an insulator state Under this condition, the polarization of the electromagnetic wave is realized and the proposed device is capable of rotating a linear polarization state into its orthogonal one by tuning the Fermi level of graphene in the hybrid metamaterial
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