论文标题
通过激光诱导的冲击波在空气中对单个微粒驱逐单个微粒的光学机电
Opto-mechanical expulsion of individual micro-particles by laser-induced shockwave in air
论文作者
论文摘要
最近证明，激光丝能够通过云和雾为自由空间光学通信应用生成光学透明的通道。但是，到目前为止，没有对激光诱导的冲击波与气溶胶颗粒之间的相互作用进行定量测量，从而使清除机制的确切性质进行讨论。一个关键的问题是丝仍可以在气溶胶颗粒上作用的最大距离。距离的距离广泛超过了灯丝直径，其能量储层不包括其他潜在的清除效应，例如通过直接暴露于激光器来破坏或爆炸。在这里，我们量化了冲击波在单个气溶胶微粒上施加的力。通过观察颗粒的射出和位移时，将粒子捕获在光学镊子中来测量。我们证明，即使对于距离丝的距离为1.5毫米至5.5 mm，因此广泛超过了丝状区域，500 pn至8 nn的声力（取决于初始激光幂）都作用于气溶胶粒子上，并将其驱散到光学TRAP上。
It was recently demonstrated that laser filamentation was able to generate an optically transparent channel through cloud and fog for free-space optical communications applications. However, no quantitative measurement of the interaction between the laser-induced shockwave and the aerosol particles was carried out so far, leaving the precise nature of the clearing mechanism up for discussion. A critical question was the maximum distance at which the filament could still act on the aerosol particle. Distances widely exceeding the filament diameter and its energy reservoir exclude other potential clearing effects like shattering or explosion by direct exposure to the laser. Here, we quantify the force exerted by the shockwave on a single aerosol microparticle. The force is measured by observing the ejection and displacement of the particle when trapped in an optical tweezer. We demonstrate that even for distances ranging from 1.5 mm to 5.5 mm away from the filament, thus widely exceeding the filamentary region, an acoustic force of 500 pN to 8 nN (depending on the initial laser power) acts on the aerosol particle and expels it away from the optical trap.
