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Generation and Superposition of Perfect Vortex Beams in Terahertz Region via Single-Layer All-Dielectric Metasurface
Wu, Qi1,2; Fan, Wenhui1,2,3; Qin, Chong1,2
作者部门瞬态光学研究室
2022-09
发表期刊NANOMATERIALS
ISSN2079-4991
卷号12期号:17
产权排序1
摘要

Terahertz (THz) orbital angular momentum (OAM) technology provides promising applications in future wireless communication with large bandwidth and high capacity. However, the ring radius of the conventional THz vortex beam is related to the topological charge, limiting the co-propagation of multiple OAM modes in the THz communication systems. Although the perfect vortex beam (PVB) based on traditional methods can solve this problem, they are usually bulky and unstable. Here, we demonstrate two PVB generators based on a single all-dielectric metasurface to obtain polarization-independent PVB and spin multiplexed PVB, respectively. The former regulates the propagation phase by using isotropic unit cells; the latter simultaneously manipulates the propagation and geometric phase to achieve the spin-decoupled phase control by arranging anisotropic unit cells. In addition, we also demonstrate the stable generation of a perfect Poincare beam with arbitrary polarization and phase distribution on a hybrid-order Poincare Sphere via a spin-decoupled metasurface, which is achieved by the linear superposition of two PVBs with orthogonal circular polarizations. The proposed scheme provides a compact and efficient platform for the generation and superposition of PVBs in THz region, and will speed up the progress of THz communication systems, complex light field generation, and quantum information sciences.

关键词all-dielectric metasurface perfect vortex beam perfect Poincare beam terahertz
DOI10.3390/nano12173010
收录类别SCI
语种英语
WOS记录号WOS:000851964900001
出版者MDPI
引用统计
文献类型期刊论文
条目标识符http://ir.opt.ac.cn/handle/181661/96143
专题瞬态光学研究室
通讯作者Fan, Wenhui
作者单位1.Chinese Acad Sci, Xian Inst Opt & Precis Mech, State Key Lab Transient Opt & Photon, Xian 710119, Peoples R China
2.Univ Chinese Acad Sci, Sch Opto Elect Technol, Beijing 100049, Peoples R China
3.Shanxi Univ, Collaborat Innovat Ctr Extreme Opt, Taiyuan 030006, Peoples R China
推荐引用方式
GB/T 7714
Wu, Qi,Fan, Wenhui,Qin, Chong. Generation and Superposition of Perfect Vortex Beams in Terahertz Region via Single-Layer All-Dielectric Metasurface[J]. NANOMATERIALS,2022,12(17).
APA Wu, Qi,Fan, Wenhui,&Qin, Chong.(2022).Generation and Superposition of Perfect Vortex Beams in Terahertz Region via Single-Layer All-Dielectric Metasurface.NANOMATERIALS,12(17).
MLA Wu, Qi,et al."Generation and Superposition of Perfect Vortex Beams in Terahertz Region via Single-Layer All-Dielectric Metasurface".NANOMATERIALS 12.17(2022).
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