Generation of Bessel vortex beams in the subterahertz range using reflecting diffractive optical elements
In this work, we propose a simple method for generating Bessel vortex beams in the subterahertz (subTHz) range with the orbital angular momentum with l = 1 based on reflecting metal diffractive optical elements with a continuous helical microrelief. The elements are fabricated by micromilling in a p...
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| Language: | English |
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Samara National Research University
2024-06-01
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| Series: | Компьютерная оптика |
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| Online Access: | https://www.computeroptics.ru/eng/KO/Annot/KO48-3/480302e.html |
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| author | V.V. Gerasimov N.D. Osintseva V.S. Pavelyev A.N. Agafonov |
| author_facet | V.V. Gerasimov N.D. Osintseva V.S. Pavelyev A.N. Agafonov |
| author_sort | V.V. Gerasimov |
| collection | DOAJ |
| description | In this work, we propose a simple method for generating Bessel vortex beams in the subterahertz (subTHz) range with the orbital angular momentum with l = 1 based on reflecting metal diffractive optical elements with a continuous helical microrelief. The elements are fabricated by micromilling in a polished duralumin substrate and by tin casting, and tested using a backward wave oscillator (wavelength λ = 855 µm). When using the micromilled element, Bessel vortex beams are shown to be generated and retain a Bessel intensity profile at a distance of 20–50 mm from the reflecting element, which is in good agreement with the results of numerical simulation. An experimental estimate of the energy efficiency of this element is 63%. When using elements made by tin casting, the vortex beams are generated with a distorted profile due to the presence of residual deformations of tin, which has plasticity. Due to their high conductivity, metallic reflecting elements can be used with high power density sub-THz radiation sources such as free electron lasers and gyrotrons. |
| format | Article |
| id | doaj-art-9dc605bcb7584a2092d2b0ede71b24e8 |
| institution | Kabale University |
| issn | 0134-2452 2412-6179 |
| language | English |
| publishDate | 2024-06-01 |
| publisher | Samara National Research University |
| record_format | Article |
| series | Компьютерная оптика |
| spelling | doaj-art-9dc605bcb7584a2092d2b0ede71b24e82025-02-05T11:57:28ZengSamara National Research UniversityКомпьютерная оптика0134-24522412-61792024-06-0148333434110.18287/2412-6179-CO-1410Generation of Bessel vortex beams in the subterahertz range using reflecting diffractive optical elementsV.V. Gerasimov0N.D. Osintseva1V.S. Pavelyev2A.N. Agafonov3Novosibirsk State University; Budker Institute of Nuclear Physics SB RASBudker Institute of Nuclear Physics SB RASSamara National Research University; Image Processing Systems Institute, NRC "Kurchatov Institute"Samara National Research UniversityIn this work, we propose a simple method for generating Bessel vortex beams in the subterahertz (subTHz) range with the orbital angular momentum with l = 1 based on reflecting metal diffractive optical elements with a continuous helical microrelief. The elements are fabricated by micromilling in a polished duralumin substrate and by tin casting, and tested using a backward wave oscillator (wavelength λ = 855 µm). When using the micromilled element, Bessel vortex beams are shown to be generated and retain a Bessel intensity profile at a distance of 20–50 mm from the reflecting element, which is in good agreement with the results of numerical simulation. An experimental estimate of the energy efficiency of this element is 63%. When using elements made by tin casting, the vortex beams are generated with a distorted profile due to the presence of residual deformations of tin, which has plasticity. Due to their high conductivity, metallic reflecting elements can be used with high power density sub-THz radiation sources such as free electron lasers and gyrotrons.https://www.computeroptics.ru/eng/KO/Annot/KO48-3/480302e.htmldiffractive opticssubterahertz rangebessel beamvortex beamreflecting diffractive optical element |
| spellingShingle | V.V. Gerasimov N.D. Osintseva V.S. Pavelyev A.N. Agafonov Generation of Bessel vortex beams in the subterahertz range using reflecting diffractive optical elements Компьютерная оптика diffractive optics subterahertz range bessel beam vortex beam reflecting diffractive optical element |
| title | Generation of Bessel vortex beams in the subterahertz range using reflecting diffractive optical elements |
| title_full | Generation of Bessel vortex beams in the subterahertz range using reflecting diffractive optical elements |
| title_fullStr | Generation of Bessel vortex beams in the subterahertz range using reflecting diffractive optical elements |
| title_full_unstemmed | Generation of Bessel vortex beams in the subterahertz range using reflecting diffractive optical elements |
| title_short | Generation of Bessel vortex beams in the subterahertz range using reflecting diffractive optical elements |
| title_sort | generation of bessel vortex beams in the subterahertz range using reflecting diffractive optical elements |
| topic | diffractive optics subterahertz range bessel beam vortex beam reflecting diffractive optical element |
| url | https://www.computeroptics.ru/eng/KO/Annot/KO48-3/480302e.html |
| work_keys_str_mv | AT vvgerasimov generationofbesselvortexbeamsinthesubterahertzrangeusingreflectingdiffractiveopticalelements AT ndosintseva generationofbesselvortexbeamsinthesubterahertzrangeusingreflectingdiffractiveopticalelements AT vspavelyev generationofbesselvortexbeamsinthesubterahertzrangeusingreflectingdiffractiveopticalelements AT anagafonov generationofbesselvortexbeamsinthesubterahertzrangeusingreflectingdiffractiveopticalelements |