| Summary: | 碩士 === 中臺科技大學 === 醫學工程暨材料研究所 === 101 === This thesis studies the rotational efficiency of optically driven Archimedes screw which is fabricated by two-photon polymerization three-dimensional micro-fabrication technology. The mobile optically driven micro-machines are demonstrated by optical tweezers for the feasibility on the applications of a Lab-on-a-chip or a microfluidic chip.
The study of optical rotational efficiency involves the effects of the screw geometries, the screw surface, and the numerical aperture (N.A.) of optical tweezers laser. The experimental results indicate that the rod of screw stabilizes the rotated micro-screw. However, the rotational efficiency decreases when the rod diameter increases because the exposure area on the screw blade is smaller. The blade thickness has no effect to rotational efficiency. However, the screw with thin blade can not stably stand when it is trapped by optical tweezers. On the other hand, the rotational efficiency increases 7 % when the N.A. decreases 1%. The gold-coated screw makes optical driving scattering force increasing, and escaping from the trapping. Finally, the micro-screw was put in a microfluidic channel. The mobile optically driven micro-machines, include micro-pump and micro-tool, were demonstrated. This thesis helps on understanding the characteristics of optically driven Archimedes screw. It is also expected to contribute multiplicate micro-machines for a lab-on-a-chip.
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