D'Aguanno, Giuseppe; Mattiucci, Nadia; Bloemer, Mark; Desyatnikov, Anton S
We show that a superresolution process with 100% visibility is characterized by the formation of a point of phase singularity in free space outside a metamaterial in the form of a saddle with topological charge equal to -1. The saddle point is connected to two vortices at the end boundaries of the lens, and the two vortices are in turn connected to another saddle point inside the lens. The structure saddle-vortices-saddle is topologically stable. The formation of the saddle point in free space...[Show more]
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