旋光微转子的光螺旋桨效应
Opto Propeller Effect on Chiral Micro-Rotors
摘要：
利用光操纵巨型生物分子和微型装置是非常有吸引力的。光驱动力矩可以驱动微转子在粘性液体中作平动运动，从而实现微系统的旋向性分离。研究了圆偏振激光器产生的介质损耗力矩。反向传播的反射光束消除了引起与旋向无关的平移运动的不必要的轴向力。通过求解纳维-斯托克斯方程，得到了推进效率和水的摩擦力矩。在有趣的参数范围内，数值摩擦力矩被发现是线性的角速度与斜率取决于半径或转子$r^3$。通过求解Fokker-Planck方程，得到了随时间变化的角速度分布。研究结果为微力矩测量提供了理论依据，并为微载体的可控性提供了参考。
英文摘要：
Manipulating mega biomolecules and micro-devices with light is highly appealing. Opto driving torque can propel micro-rotors to translational motion in viscous liquid, and then separate microsystems according to their handedness. We study the torque of dielectric loss generated by circular polarized lasers. The unwanted axial force which causes the handedness independent translational motion is cancelled by the counter propagating reflection beams. The propelling efficiency and the friction torque of water are obtained by solving the Navier-Stokes equation. In the interesting range of parameters, the numerical friction torque is found to be linear in the angular velocity with a slope depending on the radius or rotor as $r^3$. The time-dependent distribution of angular velocity is obtained as a solution of the Fokker-Planck equation, with which the thermal fluctuation is accounted. The results shed light on the micro-torque measurement and suggest a controllable micro-carrier.
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