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A quasi-continuous composite perfect electric conductor-perfect magneticconductor metasurface and a systematic metasurface design process are proposedfor the orbital angular momentum (OAM) generation. The metasurfaces reflect theincident left circularly polarized (LCP)/right circularly polarized (RCP) planewave to RCP/LCP vortex beams carrying OAM at normal or oblique direction.Unlike conventional metasurfaces that are composed of discrete scatterers, thescatterers on the proposed metasurface form a quasi-continuous pattern. Thepatterning of the metasurface is calculated through grating vectors, and nooptimization of single scatterer is required. Furthermore, the distortions fromlocal-response discontinuity of discrete scatterers are avoided. This letterprovides great convenience to high-quality OAM generation.

Quasi-Continuous Metasurfaces for Orbital Angular Momentum Generation