Functional Meta Lenses for Compound Plasmonic Vortex Field Generation and Control

Surface plasmon polaritons carrying orbital angular momentum are of great fundamental and applied interest. However, common approaches for their generation restricted to having a weak dependence on the properties plasmon-generating illumination, providing limited degree control over amount delivered momentum. Here we experimentally show that by tailoring local global geometries vortex generators, change in circular polarization handedness light imposes arbitrary large switching plasmonic Using time-resolved photoemission electron microscopy demonstrate pristine rotation direction high-order vortices. We generalize our approach create complex topological fields exemplify it studying controlling "bright vortex", exhibiting breakdown into mosaic unity-order vortices while maintaining overall density. Our results provide tools manipulation could be utilized lab-on-a-chip devices.