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Process Limitations in Microassembling using Holographic Optical Tweezers

机译:使用全息光学镊子进行微装配的工艺限制

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Microassembling with holographic optical tweezers (HOT) is a flexible manufacturing technology for the precise fabrication of complex microstructures. In contrast to classical direct writing techniques, here, microparticles are transported within a fluid to appropriate positions, where they are finally bound. Therefore, optical forces act against the inner friction of the fluid. This effect limits the microassembling process in the meaning of process speed. In this work we investigate these limitations depending on the applied laser power and particle size. Additionally, different to conventional optical tweezers, HOTs use spatial light modulators (SLM) to control the laser beam and the object's position. This is performed at discrete step sizes caused by successively imaging respective kinoforms on the SLM at specific refresh rates. An optimization of the step size and the applied update rate are crucial to reach maximum velocities in particle movement. Therefore, the performance of dynamic particle manipulation is investigated in individual experiments. Stable manipulation velocities of up to 114 μm/s have been reported in our work using 6 μm polystyrene particles and an applied laser power of 445 mW.
机译:全息光镊(HOT)进行微装配是一种用于精确制造复杂微结构的灵活制造技术。与经典的直接书写技术相比,此处的微粒在流体中被输送到合适的位置,并最终被束缚。因此,光学力抵抗流体的内摩擦。这种效果限制了微装配过程的过程速度。在这项工作中,我们将根据所施加的激光功率和粒径来研究这些限制。此外,与传统的光镊不同,HOT使用空间光调制器(SLM)来控制激光束和物体的位置。这是通过以特定的刷新率在SLM上连续成像各个kinoform所导致的离散步长来执行的。步长和应用更新率的优化对于达到粒子运动的最大速度至关重要。因此,在单个实验中研究了动态粒子处理的性能。在我们的工作中,使用6μm聚苯乙烯颗粒和施加的445 mW激光功率,已经报道了高达114μm/ s的稳定操纵速度。

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