Transverse optical torque from the magnetic spin angular momentum
We report a transverse optical torque exerted on a conventional isotropic spherical particle in a direction perpendicular to that of the illuminating wave propagation. By using full-wave simulations and deriving an analytical expression of the transverse optical torque for particle of arbitrary size...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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De Gruyter
2024-10-01
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| Series: | Nanophotonics |
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| Online Access: | https://doi.org/10.1515/nanoph-2024-0406 |
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| _version_ | 1823860521798991872 |
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| author | Wen Jiquan He Fengling Feng Lv Lu Wanli Lin Zhifang Zheng Hongxia Chen Huajin |
| author_facet | Wen Jiquan He Fengling Feng Lv Lu Wanli Lin Zhifang Zheng Hongxia Chen Huajin |
| author_sort | Wen Jiquan |
| collection | DOAJ |
| description | We report a transverse optical torque exerted on a conventional isotropic spherical particle in a direction perpendicular to that of the illuminating wave propagation. By using full-wave simulations and deriving an analytical expression of the transverse optical torque for particle of arbitrary size, the origin of this transverse optical torque is traced exclusively to the magnetic part of the spin angular momentum, regardless of the size and composition of the illuminated particle. To our surprise, for a non-magnetic dielectric particle, the transverse optical torque is found to originate mainly from the magnetic response of the particle, even when the particle size is much smaller than the illuminating wavelength. This is contrary to the general intuition that the electric response of a non-magnetic dielectric particle dominates its magnetic response in the mechanical effect of light, especially in the Rayleigh limit. |
| format | Article |
| id | doaj-art-b7330168bc0142f183efc9f804ff8121 |
| institution | Kabale University |
| issn | 2192-8614 |
| language | English |
| publishDate | 2024-10-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | Nanophotonics |
| spelling | doaj-art-b7330168bc0142f183efc9f804ff81212025-02-10T13:24:47ZengDe GruyterNanophotonics2192-86142024-10-0113244441444910.1515/nanoph-2024-0406Transverse optical torque from the magnetic spin angular momentumWen Jiquan0He Fengling1Feng Lv2Lu Wanli3Lin Zhifang4Zheng Hongxia5Chen Huajin6School of Automation, 66514Guangxi University of Science and Technology, Liuzhou, Guangxi545006, ChinaSchool of Automation, 66514Guangxi University of Science and Technology, Liuzhou, Guangxi545006, ChinaSchool of Automation, 66514Guangxi University of Science and Technology, Liuzhou, Guangxi545006, ChinaSchool of Materials Science and Physics, China University of Mining and Technology, Xuzhou, Jiangsu221116, ChinaState Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai200433, ChinaState Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai200433, ChinaSchool of Electronic Engineering, 66514Guangxi University of Science and Technology, Liuzhou, Guangxi545006, ChinaWe report a transverse optical torque exerted on a conventional isotropic spherical particle in a direction perpendicular to that of the illuminating wave propagation. By using full-wave simulations and deriving an analytical expression of the transverse optical torque for particle of arbitrary size, the origin of this transverse optical torque is traced exclusively to the magnetic part of the spin angular momentum, regardless of the size and composition of the illuminated particle. To our surprise, for a non-magnetic dielectric particle, the transverse optical torque is found to originate mainly from the magnetic response of the particle, even when the particle size is much smaller than the illuminating wavelength. This is contrary to the general intuition that the electric response of a non-magnetic dielectric particle dominates its magnetic response in the mechanical effect of light, especially in the Rayleigh limit.https://doi.org/10.1515/nanoph-2024-0406optical manipulationtransverse optical torquemagnetic spin angular momentummagnetic response |
| spellingShingle | Wen Jiquan He Fengling Feng Lv Lu Wanli Lin Zhifang Zheng Hongxia Chen Huajin Transverse optical torque from the magnetic spin angular momentum Nanophotonics optical manipulation transverse optical torque magnetic spin angular momentum magnetic response |
| title | Transverse optical torque from the magnetic spin angular momentum |
| title_full | Transverse optical torque from the magnetic spin angular momentum |
| title_fullStr | Transverse optical torque from the magnetic spin angular momentum |
| title_full_unstemmed | Transverse optical torque from the magnetic spin angular momentum |
| title_short | Transverse optical torque from the magnetic spin angular momentum |
| title_sort | transverse optical torque from the magnetic spin angular momentum |
| topic | optical manipulation transverse optical torque magnetic spin angular momentum magnetic response |
| url | https://doi.org/10.1515/nanoph-2024-0406 |
| work_keys_str_mv | AT wenjiquan transverseopticaltorquefromthemagneticspinangularmomentum AT hefengling transverseopticaltorquefromthemagneticspinangularmomentum AT fenglv transverseopticaltorquefromthemagneticspinangularmomentum AT luwanli transverseopticaltorquefromthemagneticspinangularmomentum AT linzhifang transverseopticaltorquefromthemagneticspinangularmomentum AT zhenghongxia transverseopticaltorquefromthemagneticspinangularmomentum AT chenhuajin transverseopticaltorquefromthemagneticspinangularmomentum |