Generation of Spiral Spin Density Vectors With A Circularly Polarized, Vortex Beam
Spiral spin density vectors refer to the spiral trajectory of the spin density vectors in three dimensional (3D) space, and similar to the polarization Möbius strip, polarization knots and photonic wheel, are also special polarization structures in 3D optical field and only exist in three...
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IEEE
2020-01-01
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| Series: | IEEE Photonics Journal |
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| Online Access: | https://ieeexplore.ieee.org/document/8937729/ |
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| author | Xiaoyan Pang Wenhao Liu Wenrui Miao |
| author_facet | Xiaoyan Pang Wenhao Liu Wenrui Miao |
| author_sort | Xiaoyan Pang |
| collection | DOAJ |
| description | Spiral spin density vectors refer to the spiral trajectory of the spin density vectors in three dimensional (3D) space, and similar to the polarization Möbius strip, polarization knots and photonic wheel, are also special polarization structures in 3D optical field and only exist in three dimensions. In this article, we propose a new way to generate the spiral spin density vectors with a long spiral range. This is realized by strongly focusing a circularly polarized beam with one off-axis vortex. In this field, the spiral interval of spin density vectors theoretically always exists on the propagation axis, and its position can be controlled by the beam size parameter <inline-formula><tex-math notation="LaTeX">$f/w_0$</tex-math></inline-formula>. The polarization variation and the spiral spin density vectors are discussed analytically along the propagation direction. It is found that the spiral shape and spiral ‘speed’ can be adjusted by the off-axis distance of the vortex and the semi-aperture angle of the focusing system respectively. A special spiral behavior of the spin density vector at the geometrical focus is also observed in this focused field. The spiral spin density vectors supply a new rotational degree of freedom in 3D optical field and our finding may have applications in optical micro-manipulations. |
| format | Article |
| id | doaj-art-a071dc62b42e46d791acd8288b02eba8 |
| institution | DOAJ |
| issn | 1943-0655 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Photonics Journal |
| spelling | doaj-art-a071dc62b42e46d791acd8288b02eba82025-08-20T03:15:50ZengIEEEIEEE Photonics Journal1943-06552020-01-0112211410.1109/JPHOT.2019.29611488937729Generation of Spiral Spin Density Vectors With A Circularly Polarized, Vortex BeamXiaoyan Pang0https://orcid.org/0000-0001-8265-0952Wenhao Liu1Wenrui Miao2School of Electronics and Information, Northwestern Polytechnical University, Xi’an, ChinaSchool of Electronics and Information, Northwestern Polytechnical University, Xi’an, ChinaSchool of Electronics and Information, Northwestern Polytechnical University, Xi’an, ChinaSpiral spin density vectors refer to the spiral trajectory of the spin density vectors in three dimensional (3D) space, and similar to the polarization Möbius strip, polarization knots and photonic wheel, are also special polarization structures in 3D optical field and only exist in three dimensions. In this article, we propose a new way to generate the spiral spin density vectors with a long spiral range. This is realized by strongly focusing a circularly polarized beam with one off-axis vortex. In this field, the spiral interval of spin density vectors theoretically always exists on the propagation axis, and its position can be controlled by the beam size parameter <inline-formula><tex-math notation="LaTeX">$f/w_0$</tex-math></inline-formula>. The polarization variation and the spiral spin density vectors are discussed analytically along the propagation direction. It is found that the spiral shape and spiral ‘speed’ can be adjusted by the off-axis distance of the vortex and the semi-aperture angle of the focusing system respectively. A special spiral behavior of the spin density vector at the geometrical focus is also observed in this focused field. The spiral spin density vectors supply a new rotational degree of freedom in 3D optical field and our finding may have applications in optical micro-manipulations.https://ieeexplore.ieee.org/document/8937729/Spin density vectorcircular polarizationoptical vortexorbital angular momentum. |
| spellingShingle | Xiaoyan Pang Wenhao Liu Wenrui Miao Generation of Spiral Spin Density Vectors With A Circularly Polarized, Vortex Beam IEEE Photonics Journal Spin density vector circular polarization optical vortex orbital angular momentum. |
| title | Generation of Spiral Spin Density Vectors With A Circularly Polarized, Vortex Beam |
| title_full | Generation of Spiral Spin Density Vectors With A Circularly Polarized, Vortex Beam |
| title_fullStr | Generation of Spiral Spin Density Vectors With A Circularly Polarized, Vortex Beam |
| title_full_unstemmed | Generation of Spiral Spin Density Vectors With A Circularly Polarized, Vortex Beam |
| title_short | Generation of Spiral Spin Density Vectors With A Circularly Polarized, Vortex Beam |
| title_sort | generation of spiral spin density vectors with a circularly polarized vortex beam |
| topic | Spin density vector circular polarization optical vortex orbital angular momentum. |
| url | https://ieeexplore.ieee.org/document/8937729/ |
| work_keys_str_mv | AT xiaoyanpang generationofspiralspindensityvectorswithacircularlypolarizedvortexbeam AT wenhaoliu generationofspiralspindensityvectorswithacircularlypolarizedvortexbeam AT wenruimiao generationofspiralspindensityvectorswithacircularlypolarizedvortexbeam |