Vortex Beam Generation Mechanism in Non-Local Metasurface via Intrinsic Dipolar Singularities. (IMAGE)
Caption
Electric (ED) and magnetic dipole (MD) scatterers exhibit intrinsic singularities that facilitate angular momentum conversion and wavevector redistribution, as shown in (a) and (b) respectively. Combining ED and MD scatterers induces the Kerker effect, resulting in directional scattering and enhanced angular momentum conversion essential for vortex beam formation, as shown in (c). Increasing the number of dipole scatterers leads to conical wavevector redistribution, thereby improving the directivity of the generated vortex beam in (d). An infinite array of vertically aligned dipole scatterers forms a non-local metasurface, enabling efficient and highly directional transmission of vortex beams as illustrated in (e). The red circular arrows represent MD, the red vertical arrows represent ED, and the combination of the two arrows represents the dual resonance of ED and MD. The orange vertical arrows and the green circular arrows represent the circularly polarized Gaussian incident wave beams.
Credit
Yuri kivshar
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