Transverse optical torque from the magnetic spin angular momentum.

Jiquan Wen, Fengling He, Lv Feng, Wanli Lu, Zhifang Lin, Hongxia Zheng, Huajin Chen

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Article in Nanophotonics (Berlin, Germany), 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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5 · Who and what money

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7 authors.

Jiquan WenSchool of Automation, Guangxi University of Science and Technology, Liuzhou, Guangxi 545006, China.

Fengling HeSchool of Automation, Guangxi University of Science and Technology, Liuzhou, Guangxi 545006, China.

Lv FengSchool of Automation, Guangxi University of Science and Technology, Liuzhou, Guangxi 545006, China.

Wanli LuSchool of Materials Science and Physics, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China.

Zhifang LinState Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China.

Hongxia ZhengState Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China.

Huajin ChenSchool of Electronic Engineering, Guangxi University of Science and Technology, Liuzhou, Guangxi 545006, China.ORCID https://orcid.org/0000-0002-8783-3691

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

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.

Indexed as

magnetic responsemagnetic spin angular momentumoptical manipulationtransverse optical torque

Identifiers

PMID39679180

DOI10.1515/nanoph-2024-0406

PMCPMC11635931

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