The coupling of multi-channel optical vortices based on angular momentum conservation using a single-layer metal metasurface

Abstract

Optical vortices (OVs) carry the orbital angular momentum with arbitrary topological charges, which has excellent potential in optical communication, photonic integrated circuits, optical trapping, and so on. However, it remains to be solved generating arbitrary orders of adjustable optical vortices. Here, we propose a single-layer metal porous metasurface operating in infrared band for generating vortex beams from first to fourth order based on the spin-orbit interactions (SOI). The optical vortices with integral 2π phase are obtained through generating double geometric phase induced by structural element spin rotation. Further more, the new phenomenon of optical vortices emerging on the center has also been observed in our system, which is caused by the coupling of multi-channel same-order OVs. Our works possess wide applications in optical communication, multiplex and demultiplex systems, optical capture devices, and communication coding.

Extended Field Interactions in Poisson’s Equation Revision

“…Furthermore, these equations could inform the design of innovative electron holography experiments or techniques that leverage electron beams' OAM properties. Manipulating an electron beam's OAM could pioneer new approaches to examine specific structural characteristics of a sample or enhance the resolution of electron microscopy [75][76][77].…”

“…For instance, consider an application in which researchers are working with twisted light beams (optical vortices) carrying OAM in optical communication systems [75][76][77][78][79][80][81][82][83]. They could use these equations to analyze the effects of different media on the propagation of the twisted light beams and their OAM properties.…”