In this Letter, to the best of our knowledge, a novel anisotropic surface impedance holographic metasurface antenna for generating orbital angular momentum (OAM) is developed through design, fabrication, and measurement at radio frequencies. The classical leaky-wave theory and a microwave holography method are combined to realize vortex waves carrying different OAM modes flexibly. The holographic metasurface composed of subwavelength quasi-periodic anisotropic metallic patches on a grounded dielectric substrate operates by exciting the interference patterns. The interferences are generated between a reference wave excited by the monopole antenna and a field with the desirably shaped wavefront-carrying helical phase. Numerical simulation has shown good agreement with the experimental results, which lays a solid foundation for holographic metasurface antennas having the potential for OAM generation at radio frequencies.
© 2019 Optical Society of AmericaFull Article | PDF Article
CorrectionsXiangshuai Meng, Jiaji Wu, Zhensen Wu, Lin Yang, Li Huang, Xi Li, and Tan Qu, "Design, fabrication, and measurement of an anisotropic holographic metasurface for generating vortex beams carrying orbital angular momentum: erratum," Opt. Lett. 44, 2044-2044 (2019)
14 March 2019: A typographical correction was made to Eqs. 4 and 5, and to the last sentence of the second paragraph on page 1454.
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