Comparison of the shape of focal spots in terms of intensity and energy flux for a high-aperture zone plate and a spiral zone plate
Using a finite-difference time-domain method, it has been shown that focal spots generated when tightly focusing a linearly polarized Gaussian beam by a Fresnel zone plate (FZP) and when focusing a Gaussian beam with an embedded optical vortex by a spiral zone plate (SZP) have different patterns of...
| Main Authors: | , |
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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 |
| Subjects: | |
| Online Access: | https://computeroptics.ru/eng/KO/Annot/KO46-4/460403e.html |
| _version_ | 1797794484900069376 |
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| author | A.A. Savelyeva E.S. Kozlova |
| author_facet | A.A. Savelyeva E.S. Kozlova |
| author_sort | A.A. Savelyeva |
| collection | DOAJ |
| description | Using a finite-difference time-domain method, it has been shown that focal spots generated when tightly focusing a linearly polarized Gaussian beam by a Fresnel zone plate (FZP) and when focusing a Gaussian beam with an embedded optical vortex by a spiral zone plate (SZP) have different patterns of the intensity and energy flux. The most significant differences are observed when the value of the topological charge (TC) is equal to three. The energy flux has an annular distribution when the Gaussian beam is focused by the FZP, while the SZP produces a field whose patterns of intensity and energy flux have three local maxima. The number of local maxima corresponds to the order of the SZP. At a certain distance from the focus, the petal structure of the intensity (and energy flux) changes to a ring distribution. |
| first_indexed | 2024-03-13T03:03:32Z |
| format | Article |
| id | doaj.art-4b7b55085e60470b8238f8d7bad68440 |
| institution | Directory Open Access Journal |
| issn | 0134-2452 2412-6179 |
| language | English |
| last_indexed | 2024-03-13T03:03:32Z |
| publishDate | 2022-08-01 |
| publisher | Samara National Research University |
| record_format | Article |
| series | Компьютерная оптика |
| spelling | doaj.art-4b7b55085e60470b8238f8d7bad684402023-06-27T09:40:39ZengSamara National Research UniversityКомпьютерная оптика0134-24522412-61792022-08-0146453153610.18287/2412-6179-CO-934Comparison of the shape of focal spots in terms of intensity and energy flux for a high-aperture zone plate and a spiral zone plateA.A. Savelyeva0E.S. Kozlova1IPSI RAS – Branch of the FSRC "Crystallography and Photonics" RAS; Samara National Research UniversityIPSI RAS – Branch of the FSRC "Crystallography and Photonics" RAS; Samara National Research UniversityUsing a finite-difference time-domain method, it has been shown that focal spots generated when tightly focusing a linearly polarized Gaussian beam by a Fresnel zone plate (FZP) and when focusing a Gaussian beam with an embedded optical vortex by a spiral zone plate (SZP) have different patterns of the intensity and energy flux. The most significant differences are observed when the value of the topological charge (TC) is equal to three. The energy flux has an annular distribution when the Gaussian beam is focused by the FZP, while the SZP produces a field whose patterns of intensity and energy flux have three local maxima. The number of local maxima corresponds to the order of the SZP. At a certain distance from the focus, the petal structure of the intensity (and energy flux) changes to a ring distribution.https://computeroptics.ru/eng/KO/Annot/KO46-4/460403e.htmltwo-layered dielectric microcylinderphotonic nanojettight focusingfdtd-method |
| spellingShingle | A.A. Savelyeva E.S. Kozlova Comparison of the shape of focal spots in terms of intensity and energy flux for a high-aperture zone plate and a spiral zone plate Компьютерная оптика two-layered dielectric microcylinder photonic nanojet tight focusing fdtd-method |
| title | Comparison of the shape of focal spots in terms of intensity and energy flux for a high-aperture zone plate and a spiral zone plate |
| title_full | Comparison of the shape of focal spots in terms of intensity and energy flux for a high-aperture zone plate and a spiral zone plate |
| title_fullStr | Comparison of the shape of focal spots in terms of intensity and energy flux for a high-aperture zone plate and a spiral zone plate |
| title_full_unstemmed | Comparison of the shape of focal spots in terms of intensity and energy flux for a high-aperture zone plate and a spiral zone plate |
| title_short | Comparison of the shape of focal spots in terms of intensity and energy flux for a high-aperture zone plate and a spiral zone plate |
| title_sort | comparison of the shape of focal spots in terms of intensity and energy flux for a high aperture zone plate and a spiral zone plate |
| topic | two-layered dielectric microcylinder photonic nanojet tight focusing fdtd-method |
| url | https://computeroptics.ru/eng/KO/Annot/KO46-4/460403e.html |
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