The Research On Driving Optical Rotor Based On Optical Waveguide

Motor as a mixer of micro-flow, plays a crucial role in the micro total analysis systems.In order to obtain high-speed, non-contact, high-performance rotor, People began to use lightto drive particles. Light-induced rotation is an effective means to achieve micro-mechanicalmotors. Compared with the traditional laser-driven micro-rotor device, optically-driven rotorshave the advantage of remote control without a bearing and rotational motion can mix fluids,pump liquids, which can potentially be used for sorting applications by redirecting particles inflows. As the micro-mixing device small, mixed-rate high, it can greatly reduce reagent usage,saving agents, and the system is non-contact driven, avoiding direct contact with the injurysolvent activity, so widely used in biological and chemical fields. This project is supported bythe Special Funds of the National Natural Science Foundation of China.Grant No.60927008),and the design of the micro-rotor is implemented. Theoretical modeling and simulation of theoptical force and torque impacted on the micro-rotors are investigated.In this paper, the main research contents are listed as following. To start with, we putforward a micro-motor driving by evanescent field or the exiting light field of the end opticalwaveguide. Then, the finite-differential time-domain (FDTD) method and hybrid ray-waveoptics model are used to analyze and calculate the force over the rotor surfaces in order tooptimize micro-motor. Moreover, to evaluate the performance of the liquid mixing inmicroscale systems, the microflow around the micro-motor is investigated using the ComsolMultiphysics tool. Finally, based on the above theories and outcomes, using the optical fiber,a micro-motor and its application and the system has been proposed and designed in primarystage. As the mixer, they can be applied in the μ-TAS, micro-pump and also used to study therotation motor proteins, cell membrane shear stress, the microscopic nature of the fluid,micro-drilling. In addition, when the micro-rotor is rotated in the liquid, the torques androtational frequency can be used to calculate the solution viscosity, and particle tensionalstiffness. Furthermore, we can simulate the movement of the cell by designing the model rotorsimilar to biological cell. Therefore, in-depth study of the technology plays a significantlyrole in micro-life sciences and biomedical.