拉盖尔-高斯光束作用下悬浮粒子的反常运动
Anomalous Motion of Particle Levitated by Laguerre-Gaussian beam
摘要：
拉盖尔-高斯光束具有轨道角动量。由于OAM的转移，被捕获在LG光束中的粒子将围绕光束轴旋转。粒子的旋转通常与光束OAM的旋转方向相同。然而，我们认为，当LG光束被强聚焦时，粒子和光束OAM的旋转可能是相反的方向。这种反常效应是由聚焦的LG光束施加在粒子上的负扭矩引起的，这类似于线性情况下的光学拉力。计算了强聚焦LG光束形成的光镊中捕获的微粒的散射力分布，发现微粒存在受负力矩控制的稳定运动轨迹。我们提出了几个必要条件，观察反直观的轨迹。我们的工作揭示了被强俘获的微粒具有多种运动模式。
英文摘要：
Laguerre-Gaussian (LG) beam has orbital angular momentum (OAM). A particle trapped in an LG beam will rotate about the beam axis, due to the transfer of OAM. The rotation of the particle is usually in the same direction as that of the beam OAM. However, we discovere that when the LG beam is strongly focused, the rotation of the particle and the beam OAM might be in the opposite direction. This anomalous effect is caused by the negative torque on the particle exerted by the focused LG beam, which is similar to the optical pulling force in the linear case. We calculated the scattering force distribution of a micro-particle trapped in an optical tweezers formed by the strongly focused LG beam, and showed that there exist stable trajectories of the particle that controlled by the negative torque. We proposed several necessary conditions for observing the counter-intuitive trajectories. Our work reveals that the strongly trapped micro-particle exhibits diversity of motion patterns.
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