A spirally rotating backward flow of light
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...
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Samara National Research University
2018-08-01
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doaj-e445e4b8042b48a09c08bc6b98dd93332020-11-25T03:35:15ZengSamara National Research UniversityКомпьютерная оптика0134-24522412-61792018-08-0142452753310.18287/2412-6179-2018-42-4-527-533A spirally rotating backward flow of lightVictor Kotlyar0Anton Nalimov1Samara National Research University, 34, Moskovskoye shosse, Samara, 443086, Samara, Russia: IPSI RAS – Branch of the FSRC “Crystallography and Photonics” RAS, Molodogvardeyskaya 151, 443001, Samara, RussiaSamara National Research University, 34, Moskovskoye shosse, Samara, 443086, Samara, Russia: IPSI RAS – Branch of the FSRC “Crystallography and Photonics” RAS, Molodogvardeyskaya 151, 443001, Samara, RussiaUsing 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 ≈ 1. A Rayleigh microparticle captured in the focus vicinity is expected to move in the opposite direction to the beam propagation.http://computeroptics.smr.ru/KO/PDF/KO42-4/420401.pdfbackward energy flowoptical vortexrotating beamsUmov–Poynting vector. |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Victor Kotlyar Anton Nalimov |
spellingShingle |
Victor Kotlyar Anton Nalimov A spirally rotating backward flow of light Компьютерная оптика backward energy flow optical vortex rotating beams Umov–Poynting vector. |
author_facet |
Victor Kotlyar Anton Nalimov |
author_sort |
Victor Kotlyar |
title |
A spirally rotating backward flow of light |
title_short |
A spirally rotating backward flow of light |
title_full |
A spirally rotating backward flow of light |
title_fullStr |
A spirally rotating backward flow of light |
title_full_unstemmed |
A spirally rotating backward flow of light |
title_sort |
spirally rotating backward flow of light |
publisher |
Samara National Research University |
series |
Компьютерная оптика |
issn |
0134-2452 2412-6179 |
publishDate |
2018-08-01 |
description |
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 ≈ 1. A Rayleigh microparticle captured in the focus vicinity is expected to move in the opposite direction to the beam propagation. |
topic |
backward energy flow optical vortex rotating beams Umov–Poynting vector. |
url |
http://computeroptics.smr.ru/KO/PDF/KO42-4/420401.pdf |
work_keys_str_mv |
AT victorkotlyar aspirallyrotatingbackwardflowoflight AT antonnalimov aspirallyrotatingbackwardflowoflight AT victorkotlyar spirallyrotatingbackwardflowoflight AT antonnalimov spirallyrotatingbackwardflowoflight |
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