双光源双光阱法驱动微型粒子旋转的实验研究

在自行构建的双光源双光阱实验系统中,实现了双光阱法驱动微型粒子旋转的实验研究。其原理是利用双折射晶体微粒光致旋转产生的涡旋力带动一个被光镊捕获的普通微粒进行旋转。实验观测了CaCO3粒子的旋转通过液体传动使酵母菌细胞团旋转的实验现象,当两个光阱的激光功率一定时,两个光阱的距离必须选择合适,CaCO3粒子的旋转才会通过液体的传动带动酵母菌细胞团旋转。实验结果得到CaCO3粒子逆时针旋转频率为2.75Hz,带动酵母菌粒子团顺时针旋转频率为2.25Hz。

Experimental study of driving micro-particles with double sources and double light traps

We build the double-optical-trapping and double-optical tweezer experiment system and achieve driving particles with double light traps method.The principle is that the vortex force generated by light rotation using birefringence crystal particles drives ordinary particles captured by optical tweezer rotating.The CaCO3 crystal rotation will produce vortex which can drive a yeast cell which is captured by light rotation.The rotation of the crystal particles and passive particle is observed by a CCD camera.The rotation characteristics of yeast cell which is driven by CaCO3 particles are analyzed and discussed.When the two laser power supplies are constant,the distance between two light sources must be suitable,the yeast will be driven by CaCO3 particles,and it rotates in the opposite direction of the motion of CaCO3 particles.Experimental results show that the frequency of counter-clockwise rotation of CaCO3 is 2.75 Hz and that of clockwise rotation of yeast cell mass is 2.25 Hz.