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This article is cited in 2 scientific papers (total in 2 papers)
OPTO-IT
A spirally rotating backward flow of light
V. V. Kotlyarab, A. G. Nalimovab a Samara National Research University, 34, Moskovskoye shosse, Samara, 443086, Samara, Russia
b IPSI RAS – Branch of the FSRC “Crystallography and Photonics” RAS, Molodogvardeyskaya 151, 443001, Samara, Russia
Abstract:
Using Richards-Wolf formulas, we show that when a left-hand circularly polarized optical vortex with the topological charge 3 is sharply focused in an aplanatic system, a backward near-axis energy flow is observed in the focal plane. While being zero on the axis, the backward flow is only 2-3 times smaller in magnitude than the incident energy flow coming to the focus. It is also shown that near the optical axis the reverse flow propagates spiraling counter-clockwise about the optical axis. The presence of the near-axis backward flow of energy is also shown by the FDTD-aided numerical simulation of diffraction of a circularly polarized plane wave by a third-order spiral zone plate with the NA about 1. A Rayleigh microparticle captured in the focus vicinity is expected to move in the opposite direction to the beam propagation.
Keywords:
backward energy flow, optical vortex, rotating beams, Umov–Poynting vector.
Received: 29.03.2018 Accepted: 11.04.2018
Citation:
V. V. Kotlyar, A. G. Nalimov, “A spirally rotating backward flow of light”, Computer Optics, 42:4 (2018), 527–533
Linking options:
https://www.mathnet.ru/eng/co534 https://www.mathnet.ru/eng/co/v42/i4/p527
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Abstract page: | 161 | Full-text PDF : | 50 | References: | 16 |
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