Transfer of spin angular momentum to a dielectric particle
We show here that in the sharp focus of a linearly polarized laser beam the spin vector flux has only transverse components (the effect of photonic wheels or photonic helicopter). For a linearly polarized optical vortex, the orbit-spin conversion leads to the appearance of both longitudinal and tran...
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| Format: | Article |
| Language: | English |
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Samara National Research University
2020-06-01
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| Series: | Компьютерная оптика |
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| Online Access: | http://computeroptics.smr.ru/KO/PDF/KO44-3/440304.pdf |
| _version_ | 1818521089468268544 |
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| author | V.V. Kotlyar |
| author_facet | V.V. Kotlyar |
| author_sort | V.V. Kotlyar |
| collection | DOAJ |
| description | We show here that in the sharp focus of a linearly polarized laser beam the spin vector flux has only transverse components (the effect of photonic wheels or photonic helicopter). For a linearly polarized optical vortex, the orbit-spin conversion leads to the appearance of both longitudinal and transverse components of the spin density vector in the focus. Spin-orbit conversion is experimentally demonstrated for a circularly polarized Gaussian beam when a transverse energy flux (orbital angular momentum) arises in the focus, which is transmitted to a microparticle and makes it rotate. Switching the handedness of circular polarization (from left to right) switches the microparticle rotation direction. It is also shown here that an azimuthally polarized vortex beam with an arbitrary integer topological charge generates in the focus a spin density vector that only has an axial component (pure magnetization), while the transverse spin flux is absent. |
| first_indexed | 2024-12-11T01:46:20Z |
| format | Article |
| id | doaj.art-d275d0f7078948cd89b93fc5490c051f |
| institution | Directory Open Access Journal |
| issn | 0134-2452 2412-6179 |
| language | English |
| last_indexed | 2024-12-11T01:46:20Z |
| publishDate | 2020-06-01 |
| publisher | Samara National Research University |
| record_format | Article |
| series | Компьютерная оптика |
| spelling | doaj.art-d275d0f7078948cd89b93fc5490c051f2022-12-22T01:24:54ZengSamara National Research UniversityКомпьютерная оптика0134-24522412-61792020-06-0144333334210.18287/2412-6179-CO-686Transfer of spin angular momentum to a dielectric particleV.V. Kotlyar0IPSI RAS – Branch of the FSRC “Crystallography and Photonics” RAS, 443001, Samara, Russia, Molodogvardeyskaya 151; Samara National Research University, 443086, Samara, Russia, Moskovskoye Shosse 34We show here that in the sharp focus of a linearly polarized laser beam the spin vector flux has only transverse components (the effect of photonic wheels or photonic helicopter). For a linearly polarized optical vortex, the orbit-spin conversion leads to the appearance of both longitudinal and transverse components of the spin density vector in the focus. Spin-orbit conversion is experimentally demonstrated for a circularly polarized Gaussian beam when a transverse energy flux (orbital angular momentum) arises in the focus, which is transmitted to a microparticle and makes it rotate. Switching the handedness of circular polarization (from left to right) switches the microparticle rotation direction. It is also shown here that an azimuthally polarized vortex beam with an arbitrary integer topological charge generates in the focus a spin density vector that only has an axial component (pure magnetization), while the transverse spin flux is absent.http://computeroptics.smr.ru/KO/PDF/KO44-3/440304.pdfspin angular momentumcircular polarizationorbit-spin conversionspin-orbit conversionvortex beam |
| spellingShingle | V.V. Kotlyar Transfer of spin angular momentum to a dielectric particle Компьютерная оптика spin angular momentum circular polarization orbit-spin conversion spin-orbit conversion vortex beam |
| title | Transfer of spin angular momentum to a dielectric particle |
| title_full | Transfer of spin angular momentum to a dielectric particle |
| title_fullStr | Transfer of spin angular momentum to a dielectric particle |
| title_full_unstemmed | Transfer of spin angular momentum to a dielectric particle |
| title_short | Transfer of spin angular momentum to a dielectric particle |
| title_sort | transfer of spin angular momentum to a dielectric particle |
| topic | spin angular momentum circular polarization orbit-spin conversion spin-orbit conversion vortex beam |
| url | http://computeroptics.smr.ru/KO/PDF/KO44-3/440304.pdf |
| work_keys_str_mv | AT vvkotlyar transferofspinangularmomentumtoadielectricparticle |