Arnold Jessica A, Kalume Aimable, Wang Chuji, Videen Gorden, Pan Yong-Le
Opt Lett. 2021 Nov 1;46(21):5332-5335. doi: 10.1364/OL.443506.
We present a novel method for actively controlling circular and/or spin-rotational motion of an optically trapped airborne micro-particle. A 532-nm Gaussian laser beam is shaped into an elliptical ring by a pair of axicons and a cylindrical lens. The shaped beam is then focused into an elliptic cone that produces an optical trap. As the cylindrical lens is rotated, a torque is exerted on the trapped particle, resulting in circular or spin-rotational motion. We show examples of the circular-rotational movement as a function of laser power and the rotation rate of the cylindrical lens.
我们提出了一种主动控制光学捕获的空气中微粒的圆周和/或自旋旋转运动的新方法。一束532纳米的高斯激光束通过一对轴棱锥和一个柱面透镜被整形为椭圆环。然后，整形后的光束被聚焦成一个产生光学陷阱的椭圆锥。随着柱面透镜的旋转，被捕获的粒子会受到一个扭矩，从而导致圆周或自旋旋转运动。我们展示了作为激光功率和柱面透镜旋转速率函数的圆周旋转运动示例。
