On-demand creation and control of multiple double-ring perfect vector vortex beams using a monolithic dielectric geometric metasurface

Abstract Perfect vector vortex beams (PVVBs) have emerged as indispensable tools in structured beam research owing to their topological charge (TC)-invariant annular intensity profiles and spatially engineered polarization states. The advent of double-ring PVVBs (DR-PVVBs), featuring independently configurable concentric rings, represents a substantial leap forward, offering unprecedented degrees of freedom through distinct vectorial characteristics and customizable intensity distributions per ring. Despite this potential, conventional DR-PVVB generation techniques remain hampered by bulky optical configurations, significant inter-ring crosstalk, and limited dynamic control. In this work, we present a monolithic dielectric geometric metasurface platform that enables numerically demonstrated generation and multidimensional manipulation of multiple DR-PVVBs. Our approach incorporates a double-axicon encoding architecture that precisely modulates the inter-ring separation for crosstalk suppression while enabling independent vectorial control of each ring. By precisely tailoring TCs, initial phase differences, and amplitude ratios between orthogonal perfect vortex beam components, we achieve fully decoupled control over polarization orders, polarization states, and ellipticity for both rings. Strategic propagation engineering further facilitates customized 3D beam routing with exceptional precision. We validate our platform through two key implementations: one generating DR-PVVB arrays with programmable wavefronts beating along conical helical path, and another producing planar hybrid-PVVB (HPVVB) array exhibiting diverse intensity distributions and tailored vectorial properties. As a functional demonstration, we implement a high-dimensional dual-layer optical encryption scheme utilizing planar HPVVB array, where information (true and false) encoding relies on polarization order and ellipticity, while authentication is governed by their unique combinations. This integrated framework constitutes an ultracompact platform for DR-PVVB multidimensional manipulation, offering significant potential for next-generation optical encryption, high-capacity communications, and quantum information processing.