Metasurfaces, orbital angular momenta (OAM), and non-diffractive Bessel beams have been attracting worldwide research. Combining the benefits of these three promising techniques, this paper proposes a metasurface-based reflective-type approach to generate a first-order Bessel beam carrying OAM. To validate this approach, a millimeter-wave metasurface is analyzed, designed, fabricated, and measured. Experimental results agree well with simulation. Moreover, this reflective-type metasurface, generating a Bessel beam with OAM, is inherently integrated with a planar feeding source in the same single-layer printed circuit board. Therefore, the proposed design features low profile, low cost, easy integration with front-end active circuits, and no alignment error between the feeding source and the metasurface.

2101340 (2 of 9) www.advopticalmat.de Figure 6. Comparisons of simulated and measured E-field distributions of E obj2 from port 2, including copolarized RHCP and cross-polarized LHCP radiations. Six transversal xoy-planes along the propagation path at corresponding z = 200, 250, 300, 350, 400, and 450 mm, respectively.

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