Achieving broadband multifunctional modulation of wavefront via terahertz anisotropic metasurface

作者：Jiwei Zhan, Ruixing Nie, Runxuan Zhang, Chaoxian Tang, Feng Zhao, Zijun Chen, Shenyi Huang, Sicheng Cao, Jinhui Chen, Zhengyong Song · 发表于：Results in Physics · 年份：2024 · DOI：10.1016/j.rinp.2024.107930 · 被引用次数：4 · 研究领域：Metamaterials and Metasurfaces Applications、Advanced Antenna and Metasurface Technologies、Random lasers and scattering media

• A bilayer anisotropic VO 2 metasurface is proposed, enabling four-function wavefront modulation through a simple approach. • Four channels of metasurface can be altered by adjusting the state of VO 2 and the polarization direction of incident wave. • The metasurface exhibits the outstanding ability of wavefront modulation within the wide frequency range of 2.2–3.0 THz. Vanadium dioxide (VO 2 ) has become a reliable phase change material (PCM) and is increasingly utilized in multifunctional metasurface design. This study introduces designs of bilayer anisotropic VO 2 meta -atoms in simulation for multifunctional wavefront modulation in the terahertz band. By leveraging the phase change property of VO 2 and incident wave polarization, a reconfigurable metasurface composing anisotropic meta -atoms is proposed with four distinct functions. When VO 2 is in its insulating state, the metasurface serves as a hologram generator for the x-polarized wave and a focusing reflector for the y-polarized wave. Upon the transition of VO 2 into the metallic state, the metasurface functions as a generator of vortex beam for the x-polarized wave, while as an anomalous reflector for the y-polarized wave. The proposed metasurface showcases an outstanding broadband performance, delivering impressive four-channel wavefront modulation within a frequency range of 2.2–3.0 THz. Depending on the compact structure and integrated multi-functionalities, our design may have immense potential across a wide r...