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This article is cited in 4 scientific papers (total in 4 papers)
OPTO-IT
Vortex energy flow in the tight focus of a non-vortex field with circular polarization
V. V. Kotlyarab, S. S. Stafeevba, A. G. Nalimovba a IPSI RAS – Branch of the FSRC "Crystallography and Photonics" RAS,
Molodogvardeyskaya 151, 443001, Samara, Russia
b Samara National Research University, Moskovskoye shosse, 34, 443086, Samara, Russia
Abstract:
Using Richards-Wolf formulas, we show that an axisymmetric circularly polarized vortex-free field can be focused into a sharp subwavelength focal spot, around which there is a region where the light energy flow propagates along a spiral. This effect can be explained by the conversion of the spin angular momentum of the circularly polarized field into the orbital angular momentum near the focus, although the on-axis orbital angular momentum remains zero. It is also shown that a linearly polarized optical vortex with topological charge 2 forms near the focal plane an on-axis reverse energy flow (defined by the negative longitudinal component of the Poynting vector) whose amplitude is comparable with the direct energy flow.
Keywords:
Richards-Wolf formulae, relation between spin angular momentum and orbital angular momentum, reverse energy flow, linear polarization.
Received: 17.06.2019 Accepted: 12.09.2019
Citation:
V. V. Kotlyar, S. S. Stafeev, A. G. Nalimov, “Vortex energy flow in the tight focus of a non-vortex field with circular polarization”, Computer Optics, 44:1 (2020), 5–11
Linking options:
https://www.mathnet.ru/eng/co755 https://www.mathnet.ru/eng/co/v44/i1/p5
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Abstract page: | 153 | Full-text PDF : | 42 | References: | 13 |
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