Laser-induced hydrodynamic instability of fluid interfaces

Details Laser-induced hydrodynamic instability of fluid interfaces Laser-induced hydrodynamic instability of fluid interfaces

2003-02-24

arxiv.org/abs/physics/0302085v1

Physics

Fluid Dynamics

4 pages, 4 figures. submitted for publication in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.90.144503

We report on a new class of electromagnetically-driven fluid interface instability. Using the optical radiation pressure of a cw laser to bend a very soft near-critical liquid-liquid interface, we show that it becomes unstable for sufficiently large beam power P, leading to the formation of a stationary beam-centered liquid micro-jet. We explore the behavior of the instability onset by tuning the interface softness with temperature and varying the size of the exciting beam. The instability mechanism is experimentally demonstrated. It simply relies on total reflection of light at the deformed interface whose condition provides the universal scaling relation for the onset Ps of the instability.

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