Figure 2: Numerical results for lā=ā+3, ā3, +5, ā5, respectively.
From: Generation and detection of orbital angular momentum via metasurface
The first row shows intensity distribution of the vortex beam that without interference. The interference results at the position of zā=ā5āĪ¼m (before the focal plane), zā=ā10āĪ¼m (at the focal length plane) and zā=ā15āĪ¼m (after the focal plane), are shown in second, third and fourth row respectively.
