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Chin. Phys. B, 2021, Vol. 30(5): 058103    DOI: 10.1088/1674-1056/abd75c

High efficiency and broad bandwidth terahertz vortex beam generation based on ultra-thin transmission Pancharatnam-Berry metasurfaces

Wenyu Li(李文宇)1,2, Guozhong Zhao(赵国忠)1,†, Tianhua Meng(孟田华)2, Ran Sun(孙然)1, and Jiaoyan Guo(郭姣艳)1
1 Department of Physics, Capital Normal University, Beijing Key Laboratory for THz Spectroscopy and Imaging, Key Laboratory of THz Optoelectronics, Ministry of Education, Beijing 100048, China;
2 Institute of Solid State Physics, Shanxi Datong University, Datong 037009, China
Abstract  The terahertz (THz) vortex beam generators are designed and theoretically investigated based on single-layer ultra-thin transmission metasurfaces. Noncontinuous phase changes of metasurfaces are obtained by utilizing Pancharatnam-Berry phase elements, which possess different rotation angles and are arranged on two concentric rings centered on the origin. The circularly polarized incident THz beam could be turned into a cross-polarization transmission wave, and the orbital angular momentum (OAM) varies in value by $l\hbar$. The $l$ values change from $\pm 1$ to $\pm 5$, and the maximal cross-polarization conversion efficiency that could be achieved is 23%, which nearly reaches the theoretical limit of a single-layer structure. The frequency range of the designed vortex generator is from 1.2 THz to 1.9 THz, and the generated THz vortex beam could keep a high fidelity in the operating bandwidth. The propagation behavior of the emerged THz vortex beam is analyzed in detail. Our work offers a novel way of designing ultra-thin and single-layer vortex beam generators, which have low process complexity, high conversion efficiency and broad bandwidth.
Keywords:  metasurface      terahertz vortex beam      Pancharatnam-Berry phase element      conversion efficiency  
Received:  20 October 2020      Revised:  02 December 2020      Accepted manuscript online:  30 December 2020
PACS:  81.05.Xj (Metamaterials for chiral, bianisotropic and other complex media)  
  74.25.Uv (Vortex phases (includes vortex lattices, vortex liquids, and vortex glasses))  
  03.65.Vf (Phases: geometric; dynamic or topological)  
  07.05.Tp (Computer modeling and simulation)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 62071312), the Important R&D Projects of Shanxi Province, China (Grant No. 201803D121083), and the Shanxi Scholarship Council (Grant No. 2020-135).
Corresponding Authors:  Guozhong Zhao     E-mail:

Cite this article: 

Wenyu Li(李文宇), Guozhong Zhao(赵国忠), Tianhua Meng(孟田华), Ran Sun(孙然), and Jiaoyan Guo(郭姣艳) High efficiency and broad bandwidth terahertz vortex beam generation based on ultra-thin transmission Pancharatnam-Berry metasurfaces 2021 Chin. Phys. B 30 058103

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