Scattering Forces from the Curl of the Spin Angular Momentum of a Light Field

被引:298
作者
Albaladejo, Silvia [1 ]
Marques, Manuel I. [2 ]
Laroche, Marine [3 ]
Saenz, Juan Jose [1 ,4 ]
机构
[1] Univ Autonoma Madrid, Dept Fis Mat Condensada, E-28049 Madrid, Spain
[2] Univ Autonoma Madrid, Dept Fis Mat C IV, E-28049 Madrid, Spain
[3] Univ Paris 11, CNRS, Inst Opt, Lab Charles Fabry,RD128, F-91127 Palaiseau, France
[4] DIPC, San Sebastian 20018, Spain
关键词
TRAPPED MICROSCOPIC PARTICLES; RADIATION PRESSURE; OPTICAL FORCES; MANIPULATION; BINDING; ATOMS;
D O I
10.1103/PhysRevLett.102.113602
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Light forces on small (Rayleigh) particles are usually described as the sum of two terms: the dipolar or gradient force and the scattering or radiation pressure force. The scattering force is traditionally considered proportional to the Poynting vector, which gives the direction and magnitude of the momentum flow. However, as we will show, there is an additional nonconservative contribution to the scattering force arising in a light field with nonuniform helicity. This force is shown to be proportional to the curl of the spin angular momentum of the light field. The relevance of the spin force is illustrated in the simple case of a 2D field geometry arising in the intersection region of two standing waves.
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页数:4
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