Transfer of spin angular momentum to a dielectric particle

被引:3
|
作者
Kotlyar, V. V. [1 ,2 ]
Nalimov, A. G. [1 ,2 ]
Kovalev, A. A. [1 ,2 ]
Porfirev, A. P. [1 ,2 ]
Stafeev, S. S. [1 ,2 ]
机构
[1] RAS, IPSI RAS Branch FSRC Crystallog & Photon, Molodogvardeyskaya 151, Samara 443001, Russia
[2] Samara Natl Res Univ, Moskovskoye Shosse 34, Samara 443086, Russia
基金
俄罗斯科学基金会; 俄罗斯基础研究基金会;
关键词
spin angular momentum; circular polarization; orbit-spin conversion; spin-orbit conversion; vortex beam; POLARIZATION; LIGHT; SINGULARITIES; DIFFRACTION; REVERSE; ENERGY; PHASE; FOCUS; FIELD; FLUX;
D O I
10.18287/2412-6179-CO-686
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
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.
引用
收藏
页码:333 / +
页数:12
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