摘要
We propose a switchable vortex beam polarization state terahertz multi-layer metasurface,which consists of threelayer elliptical metal crosses,four-layer dielectrics,and two-layer hollow metal circles,which are alternately superimposed.Under the normal incidence of left-handed circularly polarized(LCP)wave and the right-handed circularly polarized(RCP)waves,the proposed structure realizes three independent control functions,i.e.,focused and vortex beam,vortex beam with different topological charges,and polarization states switching,and azimuth switching of two vortex beams with different polarization states.The results show that the proposed metasurface provides a new idea for investigating the multifunctional terahertz wave modulation devices.
作者
仲敏
李九生
Min Zhong;Jiu-Sheng Li(Center for THz Research,China Jiliang University,Hangzhou 310018,China)
基金
Project supported by the National Natural Science Foundation of China(Grant Nos.61871355,61831012,and 62271460)
the Talent Project of Zhejiang Provincial Department of Science and Technology,China(Grant No.2018R52043)
the Zhejiang Key Research and Development Project of China(Grant Nos.2021C03153 and 2022C03166)
the Research Funds for the Provincial Universities of Zhejiang Province,China(Grant No.2020YW20)。
