Department of Energy and Process Engineering, Norwegian University of Science and Technology, N-7491 Trondheim, Norway.
Opt Lett. 2012 Jun 1;37(11):1928-30. doi: 10.1364/OL.37.001928.
When a micrometer-sized fluid droplet is illuminated by a laser pulse, there is a fundamental distinction between two cases. If the pulse is short in comparison with the transit time for sound across the droplet, the disruptive optical Abraham-Minkowski radiation force is countered by electrostriction, and the net stress is compressive. In contrast, if the pulse is long on this scale, electrostriction is cancelled by elastic pressure and the surviving term of the electromagnetic force, the Abraham-Minkowski force, is disruptive and deforms the droplet. Ultrashort laser pulses are routinely used in modern experiments, and impressive progress has moreover been made on laser manipulation of liquid surfaces in recent times, making a theory for combining the two pertinent. We analyze the electrostrictive contribution analytically and numerically for a spherical droplet.
当一个微米大小的液滴被激光脉冲照射时，如果脉冲的持续时间短于液滴中声波的传播时间，那么在两种情况下会有一个基本的区别。在这种情况下，中断的光 Abraham-Minkowski 辐射力会被电致伸缩抵消，并且净应力是压缩性的。相比之下，如果脉冲在这个尺度上很长，电致伸缩会被弹性压力抵消，而电磁力的幸存项，即 Abraham-Minkowski 力，是中断性的，会使液滴变形。超短激光脉冲在现代实验中被常规使用，并且最近在激光对液体表面的操纵方面取得了令人瞩目的进展，使得这两者的结合理论变得相关。我们对球形液滴的电致伸缩贡献进行了分析和数值分析。
