Peculiarities of focusing circularly and radially polarized super-Gaussian beams using ring gratings with varying relief height
The focusing features of a super-Gaussian beam, as well as Laguerre-super-Gaussian (1,0) modes with radial and circular polarizations on ring gratings (direct and inverse) with a variable height of individual relief rings were investigated in this paper. The change in the height of the relief from t...
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Format: | Article |
Language: | English |
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Samara National Research University
2022-08-01
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Series: | Компьютерная оптика |
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Online Access: | https://computeroptics.ru/eng/KO/Annot/KO46-4/460404e.html |
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author | D.A. Savelyev |
author_facet | D.A. Savelyev |
author_sort | D.A. Savelyev |
collection | DOAJ |
description | The focusing features of a super-Gaussian beam, as well as Laguerre-super-Gaussian (1,0) modes with radial and circular polarizations on ring gratings (direct and inverse) with a variable height of individual relief rings were investigated in this paper. The change in the height of the relief from the maximum height in the center to the minimum at the edges of the element (direct ring grating) is considered and the reverse case, when the maximum height of the relief was at the edges and the minimum in the center (reverse ring grating). The comparison was carried out with the action of a diffractive axicon with a comparable grating period. Numerical simulation was carried out by the finite differences in the time domain method. It was shown that the direction of change in the height of the relief rings of elements significantly affects the diffraction pattern in the near zone. In particular, for a super-Gaussian beam, the use of a direct ring grating made it possible to reduce the size of the focal spot by 18.7% for radial polarization ('sigma'=5 μm), the use of a reverse ring grating led to a decrease in the focal spot by 36.9% ('sigma'=12.25 µm) in comparison with the action of a diffractive axicon. It was also shown in the paper that when the reverse ring grating is illuminated by the Laguerre-superGauss (1,0) mode with circular polarization, the formation of a narrow and extended region of reduced intensity on the optical axis (optical trap) is observed. |
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institution | Directory Open Access Journal |
issn | 0134-2452 2412-6179 |
language | English |
last_indexed | 2024-03-13T03:04:12Z |
publishDate | 2022-08-01 |
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series | Компьютерная оптика |
spelling | doaj.art-ed94df7a888b4b0283dd9a58e578cbd12023-06-27T09:42:12ZengSamara National Research UniversityКомпьютерная оптика0134-24522412-61792022-08-0146453754610.18287/2412-6179-CO-1131Peculiarities of focusing circularly and radially polarized super-Gaussian beams using ring gratings with varying relief heightD.A. Savelyev0IPSI RAS – Branch of the FSRC "Crystallography and Photonics" RAS; Samara National Research UniversityThe focusing features of a super-Gaussian beam, as well as Laguerre-super-Gaussian (1,0) modes with radial and circular polarizations on ring gratings (direct and inverse) with a variable height of individual relief rings were investigated in this paper. The change in the height of the relief from the maximum height in the center to the minimum at the edges of the element (direct ring grating) is considered and the reverse case, when the maximum height of the relief was at the edges and the minimum in the center (reverse ring grating). The comparison was carried out with the action of a diffractive axicon with a comparable grating period. Numerical simulation was carried out by the finite differences in the time domain method. It was shown that the direction of change in the height of the relief rings of elements significantly affects the diffraction pattern in the near zone. In particular, for a super-Gaussian beam, the use of a direct ring grating made it possible to reduce the size of the focal spot by 18.7% for radial polarization ('sigma'=5 μm), the use of a reverse ring grating led to a decrease in the focal spot by 36.9% ('sigma'=12.25 µm) in comparison with the action of a diffractive axicon. It was also shown in the paper that when the reverse ring grating is illuminated by the Laguerre-superGauss (1,0) mode with circular polarization, the formation of a narrow and extended region of reduced intensity on the optical axis (optical trap) is observed.https://computeroptics.ru/eng/KO/Annot/KO46-4/460404e.htmlring gratingssuper-gaussian beamlaguerre-super-gaussian (10) modessharp focusingfdtddiffractive axiconoptical trap |
spellingShingle | D.A. Savelyev Peculiarities of focusing circularly and radially polarized super-Gaussian beams using ring gratings with varying relief height Компьютерная оптика ring gratings super-gaussian beam laguerre-super-gaussian (1 0) modes sharp focusing fdtd diffractive axicon optical trap |
title | Peculiarities of focusing circularly and radially polarized super-Gaussian beams using ring gratings with varying relief height |
title_full | Peculiarities of focusing circularly and radially polarized super-Gaussian beams using ring gratings with varying relief height |
title_fullStr | Peculiarities of focusing circularly and radially polarized super-Gaussian beams using ring gratings with varying relief height |
title_full_unstemmed | Peculiarities of focusing circularly and radially polarized super-Gaussian beams using ring gratings with varying relief height |
title_short | Peculiarities of focusing circularly and radially polarized super-Gaussian beams using ring gratings with varying relief height |
title_sort | peculiarities of focusing circularly and radially polarized super gaussian beams using ring gratings with varying relief height |
topic | ring gratings super-gaussian beam laguerre-super-gaussian (1 0) modes sharp focusing fdtd diffractive axicon optical trap |
url | https://computeroptics.ru/eng/KO/Annot/KO46-4/460404e.html |
work_keys_str_mv | AT dasavelyev peculiaritiesoffocusingcircularlyandradiallypolarizedsupergaussianbeamsusingringgratingswithvaryingreliefheight |