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Recent advances in nanotechnologies have prompted the need for tools toaccurately and non invasively manipulate individual nanoobjects. Among thepossible strategies, optical forces have been widely used to enable nanooptical tweezers capable of trapping or moving a specimen with unprecedentedaccuracy. Here, we propose an architecture consisting of a nanotip excited witha plasmonic vortex enabling effective dynamical control of nanoparticles inthree dimensions. The optical field generated by the structure can be used tomanipulate single dielectric nanoparticles acting on the total angular momentumof light used to illuminate the structure. We demonstrate that it is possibleto stably trap or force the beaming of the particle from specific points, thusenabling a new platform for nanoparticle manipulation and sorting.

Nanoparticles manipulation in 3D nanotips excited with plasmonic vortex