Optimal analysis of thickness of crystal particles based on optical drive motor
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摘要: 为了提高碳酸钙晶体转子的转动频率,采用了激光微束驱动单轴双折射晶体使其产生旋转的方法,并改进了光致旋转的实验系统。对给定实验参量下的碳酸钙晶体转子的转动频率与其厚度和激光有效功率的变化关系进行了理论分析,通过实验测得了不同厚度碳酸钙晶体转子的转动频率值,并对影响转子转动频率的主要因素进行了详细讨论。结果表明,碳酸钙晶体转子的转动频率与其厚度呈现余弦变化关系,当入射有效激光功率为10mW时,测得其最大转动频率值为8.9Hz,实验结果与理论模拟基本吻合。该结论为微观范围内生物活细胞的颗粒分类、微纳机械转子的性能研究等提供了技术保障。Abstract: In order to improve the rotational frequency of a CaCO3 crystal rotor, based on optical rotation caused by the transfer of spin angular momentum from the laser beam to birefringence crystal particles, an experimental system of optical tweezers was designed and further improved with the circular polarized light beam. The relation between the rotation frequency of a calcium carbonate rotor and the thickness was simulated under different laser power. The rotation frequency of the calcium carbonate rotor with different thickness was measured in the experiment. The primary affecting factors of rotation frequency, such as thickness, radius, and orientation of the optic axis were analyzed. The results show that experimental curve of rotation frequency and thickness is periodic cosine function meanwhile the rotation frequency of the crystal rotor is proportional to the effective power. The maximum frequency of the crystal rotor can reach 8.9Hz in the experiment when effective power is 10mW, which is consistent with the theoretical simulation result. The conclusion supply the theoretical basis and technological guarantee for the classification of living biological cells, the study on properties of micro-mechanical rotor in the microscopic fields.
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Keywords:
- physical optics /
- optical rotation /
- spin angular momentum /
- rotation frequency
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1. 魏勇. 用激光光镊测量液体微区的粘滞系数. 激光技术. 2016(05): 738-741 . 
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