Phase singularity of surface plasmon polaritons generated by optical vortices: P. S. Tan, G. H. Yuan, Q. Wang, N. Zhang, D. H. Zhang, X.-C. Yuan
We demonstrate an experimental result that shows the phase singularity of surface plasmon waves generated by the direct transform of optical vortices at normal incidence focused on a structureless metal surface. The near-field two-dimensional intensity distribution near the focal plane is ... [Opt. Lett. 36, 3287-3289 (2011)]
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