Efficient manipulations of circularly polarized terahertz waves with transmissive metasurfaces

Min Jia; Zhuo Wang; Heting Li; Xinke Wang; Weijie Luo; Shulin Sun; Yan Zhang; Qiong He; Lei Zhou

doi:10.1038/s41377-019-0127-0

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Efficient manipulations of circularly polarized terahertz waves with transmissive metasurfaces

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- Efficient manipulations of circularly polarized terahertz waves with transmissive metasurfaces
- Efficient manipulations of circularly polarized terahertz waves with transmissive metasurfaces
- LSA 2019年8卷第1期页码：145-153
- Affiliations：
  
  1.State Key Laboratory of Surface Physics and Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), and Department of Physics, Fudan University, 200438, Shanghai, China
  2.Beijing Key Laboratory of Metamaterials and Devices, Key Laboratory of Terahertz Optoelectronics (Ministry of Education), and Beijing Advanced Innovation Center for Imaging Technology, Capital Normal University, 100048, Beijing, China
  3.Shanghai Engineering Research Center of Ultra-Precision Optical Manufacturing, Green Photonics and Department of Optical Science and Engineering, Fudan University, 200433, Shanghai, China
  4.Collaborative Innovation Center of Advanced Microstructures, 210093, Nanjing, China
- Author bio：
  
  Qiong He (qionghe@fudan.edu.cn)
  Lei Zhou (phzhou@fudan.edu.cn)
- Funds：
- DOI：10.1038/s41377-019-0127-0
  中图分类号：
- 纸质出版日期：2019，
  
  网络出版日期：2019-01-30，
  
  收稿日期：2018-08-15，
  
  修回日期：2019-01-10，
  
  录用日期：2019-01-10
- Accepted：
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Efficient manipulations of circularly polarized terahertz waves with transmissive metasurfaces[J]. LSA, 2019,8(1):145-153.

Jia, M. et al. Efficient manipulations of circularly polarized terahertz waves with transmissive metasurfaces. Light: Science & Applications, 8, 145-153 (2019).
Efficient manipulations of circularly polarized terahertz waves with transmissive metasurfaces[J]. LSA, 2019,8(1):145-153. DOI： 10.1038/s41377-019-0127-0.

Jia, M. et al. Efficient manipulations of circularly polarized terahertz waves with transmissive metasurfaces. Light: Science & Applications, 8, 145-153 (2019). DOI： 10.1038/s41377-019-0127-0.

摘要

Abstract

The unrestricted control of circularly polarized (CP) terahertz (THz) waves is important in science and applications

but conventional THz devices suffer from issues of bulky size and low efficiency. Although Pancharatnam–Berry (PB) metasurfaces have shown strong capabilities to control CP waves

transmission

-mode PB devices realized in the THz regime are less efficient

limiting their applications in practice. Here

based on Jones matrix analysis

we design a tri-layer structure (thickness of ~λ/5) and experimentally demonstrate that the structure can serve as a highly efficient

transmissive

meta-atom (relative efficiency of ~90%) to build PB metadevices for manipulating CP THz waves. Two ultrathin THz metadevices are fabricated and experimentally characterized with a

-scan THz imaging system. The first device can realize a photonic spin Hall effect with an experimentally demonstrated relative efficiency of ~90%

whereas the second device can generate a high-quality background-free CP Bessel beam with measured longitudinal and transverse field patterns that exhibit the nondiffracting characteristics of a Bessel beam. All the experimental results are in excellent agreement with full-wave simulations. Our results pave the way to freely manipulate CP THz beams

laying a solid basis for future applications such as biomolecular control and THz signal transportation.

关键词

Keywords

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