Open AccessStrong negative longitudinal component of the Poynting vector in a tightly focused cylindrical vector beam
Author(s) -
Sergey S. Stafeev,
Anton G. Nalimov,
V. V. Kotlyar
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1461/1/012169
Subject(s) - poynting vector , physics , energy flow , polarization (electrochemistry) , optics , beam (structure) , vortex , circular polarization , focus (optics) , energy current , vector flow , energy (signal processing) , mechanics , quantum mechanics , chemistry , segmentation , artificial intelligence , magnetic field , computer science , image segmentation , microstrip
It was shown that tightly focused cylindrical vector beam of m-th order produces reverse energy flow in the focal plane ( m =2). If m =3 the reverse energy flow on the axis is equal to zero and near the axis it increases in proportion to a square of the distance to the axis. The azimuthally polarized beam of the m -th order is an example of a polarization vortex. Previously, the reverse energy flow in the focus was obtained only for vortex beams with a topological charge m and circular polarization. Numerically, using the FDTD method and the Richards-Wolf formulae, it was shown that in the focus of the zone plate such laser beams produce regions the Poynting vector opposite to the direction of propagation of the beam.