Polarization induced reconfigurable multiple OAM vortex waves through a composite meta-surface beam former

We demonstrate a composite meta-surface beam former to generate reconfigurable multiple orbital angular momentum (OAM) vortex waves by integrating a polarization conversion meta-mirror with a multi-functional anisotropic meta-lens. More specifically, electromagnetic fields from the feed would be firstly reflected by the meta-mirror, and then transmit through the meta-lens to form the well converged OAM vortex waves with tailored beam numbers, radiation directions and topological charges. Especially, we show that the anisotropic characteristics of the meta-lens would create different multiple OAM vortex waves when the meta-mirror is rotated or equipped with active circuits to have different polarized illuminations on the meta-lens. Our design should pave the way for the reconfigurable design of generating multiple OAM vortex waves to further expand the communication capacity. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Automated summary

The study presents a composite meta-surface beam former that generates reconfigurable multiple OAM vortex waves by integrating a polarization conversion meta-mirror with a multi-functional anisotropic meta-lens, allowing for tailored beam numbers, radiation directions, and topological charges. It shows that the anisotropic characteristics of the meta-lens can create different multiple OAM vortex waves when the meta-mirror is rotated or equipped with different polarized illuminations. This design could pave the way for the reconfigurable generation of multiple OAM vortex waves to expand communication capacity further.