Plasmonic resonance scattering from a silver nanowire illuminated by a tightly focused singular beam

Scattering features of tightly focused singular beams are investigated by placing a cylindrical nanowire in the vicinity of a line phase singularity. Applying illumination wavelength corresponding to silver cylinder plasmonic resonance, we compare the scattering response with that of a perfect conductor. The rigorous modeling employs a 2D versions of the Richards-Wolf focusing method and the source model technique. It is found that a cylinder with a plasmonic resonance produces a strong scattering response by deflecting the power flow towards the optical singularity region, where otherwise the power approaches zero.