Laser梁汇聚瑞利粒子射流的动力学研究
Study on the Kinetics of Rayleigh Particle Jets Converging by Laser Beams
摘要：
本文讨论了激光诱导瑞利粒子射流的流动稳定。激光技术，在微/纳米尺度的静态单体粒子操作中有重要应用，如光镊，或用于粒子群宏观物理特征的被动测量。然而，激光束直接动态地干涉粒子群体的行为，以达到即时群体操纵的目的，这是相对罕见的。基于粒子动力学和流体动力学稳定性理论的理论分析，研究了光致会聚对稀薄射流（作为从喷嘴发射粒子的点源）和由Rayleigh尺寸粒子组成的稠密射流的影响。对于稀薄粒子射流的分析，与经典的真空蒸发沉积理论相比，我们发现激光对粒子的运动有积极的引导作用，使粒子的运动路径更集中。这种收敛效应也发生在密集的瑞利粒子射流的情况下。粒子动力学模拟和流体动力学稳定性分析相互验证了光场力对粒子射流界面上长波和短波不稳定性的抑制作用，具有广谱稳定特性。因此，真空蒸发中的扩散粒子也可以通过激光具有非常好的靶向聚集。
英文摘要：
This paper discusses laser-induced flow stabilizing of Rayleigh particle jets. Laser technology, has important applications in micro/nano-scale static monomer particle operations, such as optical tweezers, or is used for the passive measurement of macroscopic physical features of particle groups. However, it is relatively rare for the laser beam to directly interfere with the behavior of particle populations dynamically, so as to achieve the purpose of instant group manipulations. Based on the theoretical analysis of particle dynamics and hydrodynamic stability theory, the effects of light induced convergence on rarified jets (as a point source emitting particle off a nozzle) and denser jets consists of Rayleigh sized particles have been considered. For rarified particle jet's analysis, compared with the classical vacuum evaporation deposition theory, we found that the laser positively guided the movement of particles, leading their pathes into more concentrated targets. Such convergence effect also happens in the case of denser Rayleigh particle jets. Particle dynamics simulations and hydrodynamic stability analysis mutually authenticated that the optical field forces suppress the instability both of long-wave and short-wave on particle jet interfaces, and have broad-spectrum stabilization characteristics. Therefor, diffusive particles in vacuum evaporation can also have very good targeted aggregations by laser.
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