论文标题
{magnus}效果的光学类似物在光学镊子中的离轴偶极力
Off-axis dipole forces in optical tweezers by an optical analog of the {Magnus} effect
论文作者
论文摘要
结果表明，圆形偶极子可以偏转诱导它的聚焦激光束，并会经历相应的横向力。定量表达式是针对高斯和角式束束得出的，而效果在平面波极限中消失。该现象类似于马格努斯效应，将旋转的球推到弯曲轨迹上。光学案例起源于偶极子和光的自旋和轨道角动量的耦合。在光学镊子中，力会导致原子捕获位置的离轴位移，旋转依赖性量高达$λ/2π$，这是由磁场的方向设定的。这提出了展示和探索这些效果的直接方法，例如诱导自旋依赖性运动。
It is shown that a circular dipole can deflect the focused laser beam that induces it, and will experience a corresponding transverse force. Quantitative expressions are derived for Gaussian and angular tophat beams, while the effects vanish in the plane-wave limit. The phenomena are analogous to the Magnus effect pushing a spinning ball onto a curved trajectory. The optical case originates in the coupling of spin and orbital angular momentum of the dipole and the light. In optical tweezers the force causes off-axis displacement of the trapping position of an atom by a spin-dependent amount up to $λ/2π$, set by the direction of a magnetic field. This suggests direct methods to demonstrate and explore these effects, for instance to induce spin-dependent motion.
