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中文摘要：
理论分析了由于光束轨道角动量和自旋角动量传递以及微粒的特殊形状导致微粒旋转的机理.实验建立了单光束激光光镊装置,不仅可以捕获并移动直径为微米量级的微小粒子,而且利用圆偏振光与微粒之间角动量的传递,实现了对具有双折射特性的碳酸钙微粒的光致旋转.实验中发现微粒的旋转不仅取决于光束的偏振态,还与微粒本身的形状有关,解释了实验中观察到的几种旋转现象.碳酸钙微粒旋转的最高转速达到12转/秒,转速与激光功率成正比.
英文摘要：
The mechanisms of optically driven rotation of particles by using orbital angular momentum and spin angular momentum of light as well as by using specially shaped particles are analyzed in this paper.An optical tweezers is set up in the experiment.It can not only trap and move micro-sized particles but also rotate birefringent calcium carbonate particles by using the spin angular momentum transfer of the circular polarized light to the particles.It is found that the optical rotation depends not only on the polarization of the incident light but also on the shape of the particle.Various rotation phenomena observed in our experiment are analysed and explained.The maximal rotation speed of the calcium carbonate particle can reach 12 rps.The rotation speed is proportional to the light intensity.
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