Generation of cylindrical vector vortex beams by two cascaded metasurfaces

TL;DR

This paper introduces a straightforward method using two cascaded metasurfaces to generate customizable cylindrical vector vortex beams by controlling phase and polarization.

Contribution

It demonstrates a novel approach employing cascaded metasurfaces as space-variant phase elements for versatile CVV beam generation.

Findings

Able to generate any desired CVV beam

Simultaneous control of phase and polarization

High efficiency and simplicity

Abstract

We present a simple and efficient method to generate any cylindrical vector vortex (CVV) beams based on two cascaded metasurfaces. The metasurface works as a space-variant Panchratnam-Berry phase element and can produce any desirable vortex phase and vector polarization. The first metasurface is used to switch the sign of topological charges associated with vortex, and the second metasurface is applied to manipulate the local polarization. This method allows us to simultaneously manipulate polarization and phase of the CVV beams.