The Study On Realizations Of Micro-Mechanical Motor

The invention and applications of micro manipulation technology based on optical tweezers has brought micro mechanical design research into a new stage. Optical rotation technology is the micro manipulation technology, based on three dimensional manipulation and an added angular drive. It provided new ideas and breaches for the design of micro-mechanical motor research. How to realize the rotation of micro institutions, stimulated by light, is the key to solve the problem elicited by the conception of optical driven micro-mechanical motor. The laser beam used to rotate particles should possess linear momentum, orbital angular momentum or spin angular momentum while particles should be specially shaped or light absorbed or birefringent and so on. In accordance with these problems, the paper studied the following contents:First of all, the basic principle of optical rotation and several kinds of optical rotation realizations were introduced and analyses over conditions necessary for particles rotation induced by vortex beam. Corresponding experimental conditions, which enhance stability of light traps and improve angular velocity of particles, were proposed. Theoretical derivation on the acquisition of light eddy and simulations for the access to obtain Bessel-like beam by computer generated holography were accomplished.Secondly, the interaction process between polarization beam and birefringence crystal particle were studied theoretically and experimentally. The principle that spin and orbital angular momentum of beam transmitted to birefringence crystal particles and caused the rotation of particles was discussed. Under the condition that the parameter was given, optical torsional moment was simulated numerically. Based on the results, we discussed the effects of laser power, birefringence crystal particle radius, thickness and optical parameters on torsional moment. According to these, optical rotation experiment device was designed, and based on this experiment device, the angular velocity of two kinds of birefringence crystal particles (CaCO₃ and SiO₂) experimental measurements were accomplished.Finally, in light of the optical rotation technology the theoretical analysis and experimental research, this paper consummated its device; further more presented a single light double optical traps micro- mechanical motor experiment system and a dual light source double optical trap micro-mechanical motor experiment system.