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利用双折射晶体微粒在具有自旋角动量的光束作用下可产生围绕自身光轴旋转的特性,在光镊实验平台上实现了双折射晶体微粒的光致旋转。为了提高晶体微粒的旋转频率,从理论和实验上对双折射晶体微粒的旋转频率受其半径的影响进行了分析。用MATLAB模拟出CaCO3晶体微粒和SiO2晶体微粒的旋转频率与其半径的三次方成反比的关系曲线,并测得相应的实验关系曲线,其结果与理论分析相吻合。在相同的激光功率下,CaCO3晶体微粒的最高旋转频率可达15.1 Hz,SiO2晶体微粒的最高旋转频率可达11.4 Hz。该结论可用于光致旋转在实际应用中晶体微粒大小的选择和其旋转频率的优化控制。
The birefringent crystal particles can be rotated around their own optical axis under the action of a beam with spin angular momentum, and the photo-rotation of the birefringent crystal particles is achieved on the optical tweezers experimental platform. In order to improve the rotation frequency of crystal particles, the theoretical and experimental analysis of the influence of the radius of the rotation frequency of birefringent crystal particles is carried out. Using MATLAB to simulate the rotation frequency of CaCO3 crystal particles and SiO2 crystal particles inversely proportional to the radius of the third power curve and measured the corresponding experimental curve, the results are consistent with the theoretical analysis. Under the same laser power, the maximum rotation frequency of CaCO3 crystal particles can reach 15.1 Hz, and the maximum rotation frequency of SiO2 crystal particles can reach 11.4 Hz. This conclusion can be used for the selection of the size of crystalline particles and the optimal control of the rotational frequency of photonic rotation in practical applications.