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Generating high-purity orbital angular momentum vortex waves from Cassegrain meta-mirrors

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Abstract

Cassegrain meta-mirrors are proposed to generate the orbital angular momentum (OAM) vortex waves through dual-reflecting system with two-planar grounded meta-surfaces of properly devised sub-wavelength ring patches. More specifically, electromagnetic fields reflected by the secondary meta-mirror would subsequently be collimated by the primary meta-mirror and transformed into the well-converged OAM vortex waves possessing the merits of high directivities with clear helix wave-fronts. We extend such a design into conformal Cassegrain systems having the primary meta-mirrors of concave and convex profiles, respectively, and also demonstrate excellent syntheses of OAM vortex beams. Our design, using the dual-reflecting meta-mirrors to generate high-purity OAM vortex waves, can obtain the radiations with more stable angular momentum numbers in the long-distance propagation for the OAM wireless communications.

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Data Availability Statement

This manuscript has associated data in a data repository. [Authors’ comment:...].

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Acknowledgements

This work was supported by National Natural Science Foundation of China (41904169).

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Authors and Affiliations

  1. School of Mechanical, Electrical and Information Engineering, Shandong University, Weihai, 264209, China

    Dongxing Gao & Yanling Wang

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  1. Dongxing Gao
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  2. Yanling Wang
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Correspondence to Dongxing Gao.

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Gao, D., Wang, Y. Generating high-purity orbital angular momentum vortex waves from Cassegrain meta-mirrors. Eur. Phys. J. Plus 135, 921 (2020). https://doi.org/10.1140/epjp/s13360-020-00929-0

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