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从理论上分析了偏振光束与双折射晶体粒子的相互作用过程,讨论了由于光束自旋角动量向晶体粒子的传递所导致的光致旋转效应的原理,并在纳米光镊装置上利用线偏振He Ne激光器(633 nm,10 mW)形成了光镊光阱,利用1/4波片来改变光镊光束的偏振状态,在不同的椭圆偏振状态下实现了直径约为几微米的CaCO3 晶体微粒的捕获和光致转动.同时利用CCD相机和四像限探测器(QD)测量了粒子光致旋转的转动频率,研究了粒子的旋转频率随激光功率的变化关系.结合实验结果从理论上详细讨论了粒子自身的性质,如厚度、半径和晶体粒子的光轴取向等因素对粒子光致旋转转动速度与激光功率关系的影响.
The interaction between polarized beam and birefringent crystal particles is theoretically analyzed. The principle of photo-rotation due to the transfer of beam angular momentum to crystal particles is discussed. The linear polarization The HeNe laser (633 nm, 10 mW) forms an optical tweezers optical trap that uses a quarter-wave plate to change the polarization state of the optical tweezers and to achieve CaCO3 crystal particles of about several microns in diameter at different elliptical polarization The rotational frequency of the particles was measured by CCD camera and QD detector, and the relationship between the rotation frequency of the particles and the laser power was studied.According to the experimental results, The properties of the particles themselves, such as the thickness, the radius and the optical axis orientation of the crystal particles on the relationship between the photon rotation speed and the laser power.