Abstract
In this paper, an anisotropic coding metasurface is proposed to achieve dual-mode vortex beam generator by independently manipulating the orthogonally linearly polarized waves. The metasurface is composed of ultrathin single-layer ground-backed Jerusalem cross structure, which can provide complete and independent control of the orthogonally linearly polarized incident waves with greatly simplified design process. As proof of concept, a metasurface is designed to generate vortex beams with different topological charges under orthogonal polarizations operating at 15 GHz. Experimental measurements performed on fabricated prototype reveal high quality, and show good agreements with theoretical designs and simulation results. Such ultrathin dual-mode vortex beam generator may find potential applications in wireless communication systems in microwave region.
Highlights
In this paper, an anisotropic coding metasurface is proposed to achieve dual-mode vortex beam generator by independently manipulating the orthogonally linearly polarized waves
As one of the natural properties of electromagnetic (EM) waves, angular momentum plays an essential role in the manipulation of EM waves including spin angular momentum (SAM) and orbit angular momentum (OAM)
We further demonstrate the simultaneous generation of dual-mode convergent OAM vortex beams utilizing a reflective metasurface under orthogonally linearly polarized incidences
Summary
An anisotropic coding metasurface is proposed to achieve dual-mode vortex beam generator by independently manipulating the orthogonally linearly polarized waves. Compared with previous published works, the proposed metasurface show the ultrathin property, and use only single layer substrate without air gap between the substrate and the metal ground, which provides more advantages in fabrication, installation and integration. Such dual-mode functionality provided by a single metasurface shows advantage in the multiread communication system to replace two independent OAM antennas with orthogonal polarizations. The simulated and experimental results verify the effectiveness of the proposed design
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