晶体微粒光旋转频率受其厚度影响的实验分析  

Effects of the Thickness of Crystal Particle on Its Optical Rotation Frequency

作　　者：魏勇[1,2] 肖长江[2] 刑经纬 

机构地区：[1]燕山大学里仁学院,河北秦皇岛066004 [2]燕山大学理学院,河北秦皇岛066004

出　　处：《半导体光电》2015年第2期236-239,共4页Semiconductor Optoelectronics

基　　金：国家自然科学基金项目(50875232);秦皇岛市科学技术研究与发展计划项目(201101A071;201101A072)

摘　　要：为优化双折射晶体微粒的旋转频率,基于光致旋转技术对晶体微粒在偏振光自旋角动量作用下的转动进行了理论分析,通过给定参数模拟了石英(SiO2)晶体微粒旋转频率与其厚度和激光有效功率的变化关系曲线。依此优化了光致旋转的实验装置,并在此装置上对不同厚度的石英晶体微粒的旋转频率进行了测量。结果表明,微粒的旋转频率与微粒厚度呈现周期性曲线变化关系,并且旋转频率与有效激光功率成正比,实验测得石英晶体微粒的最高旋转频率为9.2Hz,与理论模拟结果基本吻合。该结论为光驱动微机械马达实现技术的进一步深入研究提供了基础理论和技术保障。For optimizing the rotation frequency of birefringent crystal particles,the rotation of crystal particles due to the transfer of spin angular momentum was theorically analyzed based on optical rotation technique.Then the variation curve of the the rotation frequency of SiO2 crystals with its thickness and the effective laser power was simulated with given parameters,based on which,the experimental apparatus were optimized.And the rotation frequency of SiO2 particles with different thickness was measured.The experimental results show that the curve of rotation frequency varing with the thickness presentsa periodic cosine undulation,meanwhile it is obtained that the rotation frequency is proportional to laser power.The maximum frequency of SiO2 can achieve 9.2Hz,which is in agreement with the theoretical simulation.

关 键 词：激光光学 光致旋转 自旋角动量 旋转频率 

分 类 号：O436.3[机械工程—光学工程]