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This article is cited in 15 scientific papers (total in 15 papers)
OPTO-IT
Energy backflow in a focal spot of the cylindrical vector beam
S. S. Stafeevab, A. G. Nalimovba, V. V. Kotlyarba a IPSI RAS – Branch of the FSRC “Crystallography and Photonics” RAS, Molodogvardeyskaya 151, 443001, Samara, Russia
b Samara National Research University, 34, Moskovskoye shosse, Samara, 443086, Samara, Russia
Abstract:
Using Richards-Wolf formulae it is shown that a tightly focused azimuthally-radially polarized m-th order laser beam with an arbitrary apodization function produces a reverse energy flow in the focal plane ($m=2$). If $m=3$, the reverse energy flow on the axis is equal to zero, increasing in the axis vicinity as the square of the distance to the axis. The azimuthally-radially 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 circularly polarized vortex beams with the topological charge m. Using the FDTD method and the Richards-Wolf formulae, we show numerically that in the focus of a zone plate such laser beams produce regions where the Poynting vector is opposite to the direction of the beam propagation.
Keywords:
Richards-Wolf formulae, FDTD-method, polarization vortex, energy backflow.
Received: 28.05.2018 Accepted: 18.07.2018
Citation:
S. S. Stafeev, A. G. Nalimov, V. V. Kotlyar, “Energy backflow in a focal spot of the cylindrical vector beam”, Computer Optics, 42:5 (2018), 744–750
Linking options:
https://www.mathnet.ru/eng/co556 https://www.mathnet.ru/eng/co/v42/i5/p744
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Abstract page: | 211 | Full-text PDF : | 106 | References: | 32 |
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