利用光镊技术演示光的自旋角动量

Optical induced rotation using optical tweezers

阐述了光与物体相互作用时自旋角动量的传递与扭力矩原理.基于光镊光致旋转原理,利用能够悬浮单个粒子的光镊技术并采用具有双折射特性的CaCO3晶体粒子,设计了微粒在不同偏振光场中的旋转运动实验内容,研究光与双折射晶体粒子相互作用产生的光致旋转效应,观察和测量由自旋角动量引起粒子的扭转力矩的大小、方向以及旋转速度等力学效应.

The angular momentum of light is demonstrated by the optical induced rotation and its control of uniaxial crystal particles based on angular momentum exchange between laser optical tweezers and crystal samples. Different manipulations including different orientation and different rotation speeds and directions of crystal samples are achieved using general optical tweezers combined with different wave plates and polarizers. The mechanical effect of the angular momentum of light is demonstrated by the simple but intuitionistic experiment.