(a) Schematic illustration of the superposed m = 0 mode and m > 0 modes, which is similar to the vortex waves with l = 1,2,3. The red lines represent the maximum of the beats waves; the lighter lines indicate the beats behind the wire and the darker ones indicate the beats on the reader’s side. (b) The scheme of electric field distributions on plasmonic cylindrical nanowires excited by focusing light on one left terminals with polarization at + 45°(A^L), –45°(A^R) and 0°(A⁰) directions to z axis.