Figure 5
From: Dynamically sculpturing plasmonic vortices: from integer to fractional orbital angular momentum

Comparisons between analytical and FDTD results.
(a–c) Comparisons of |an| with lpv = 2, 2.25 and 2.5, respectively. (d) The calculated actual mean OAM (dots) from FDTD compared with the analytical predictions (solid line).