4.6 Article

Multifunctional reflection type anisotropic metasurfaces in the terahertz band

Journal

OPTICAL MATERIALS EXPRESS
Volume 12, Issue 5, Pages 2003-2011

Publisher

Optica Publishing Group
DOI: 10.1364/OME.458836

Keywords

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Funding

  1. National Natural Science Foundation of China [61831012, 61871355]
  2. Talent project of Zhejiang Provincial Department of Science and Technology [2018R52043]
  3. Zhejiang Key R & D Project of China [2021C03153, 2022C03166]
  4. Research Funds for the Provincial Universities of Zhejiang [2020YW20, 2021YW86]

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Based on the convolution and superposition theorem, a reflective anisotropic metasurface is proposed to achieve the functions of deflection and superposition of vortex beams, bifocal focusing, and focusing vortex beam. This metasurface can flexibly manipulate terahertz wave under different polarization waves incidence and has potential application prospects in the field of terahertz communication.
Based on the convolution and superposition theorem, we propose a reflective anisotropic metasurface to realize the functions of deflection and superposition of vortex beams, bifocal focusing, and focusing vortex beam. At frequency of 1.04THz, two deflection vortex beams with topological charges of (l=-1 and l=+2) and (l=+1 and l=-2) are generated under x- and y-polarized terahertz wave incidence, respectively. At focal plane, 1200 mu m from the top layer of the proposed metasurface, one can see that the bifocal focusing along y-axis and x-axis are produced under x- and y-polarized terahertz wave incidence, respectively. Similarly, focusing vortex beams with l=+1 and l=-2 are realized under x- and y-polarized terahertz wave incidence, respectively. The designed metasurface can flexibly manipulate terahertz wave under different polarization waves incidence and has potential application prospects in fields of terahertz communication. (C) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement

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