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Opto-hydrodynamic instability of fluid interfaces

机译：流体界面的光流体动力学不稳定性

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The bending of fluid interfaces by the optical radiation pressure is now recognized as an appealing contactless tool to probe microscopic surface properties of soft materials. However, as the radiation pressure is intrinsically weak (typically of the order of a few Pascal), investigations are often limited to the regime of weak deformations. Non-linear behaviors can nevertheless be investigated using very soft fluid interfaces. Either a large stable tether is formed, or else a break-up of the interface occurs above a well-defined beam power threshold, depending on the direction of the beam propagation. This asymmetry originates from the occurrence of total reflection condition of light at deformed interface. Interface instability results in the formation of a stationary beam-centered liquid micro-jet that emits droplets. Radiation-induced jetting can also lead to giant tunable liquid columns with aspect ratio up to 100, i.e. well beyond the fundamental Rayleigh-Plateau limitation. Consequently, the applications range of the opto-hydrodynamic interface instability is wide, going from adaptative micro-optics (lensing and light guiding by the induced columns) to micro-fluidics and micro-spraying, as fluid transfer is optically monitored and directed in three dimensions.
机译：通过光学辐射压力使流体界面弯曲现在被认为是一种探测软材料微观表面特性的吸引人的非接触工具。但是，由于辐射压力本质上是微弱的（通常为几帕斯卡的量级），因此研究通常仅限于微弱变形的情况。但是，可以使用非常柔软的流体界面来研究非线性行为。要么形成一个大的稳定的系链，要么根据光束传播的方向，在一个明确定义的光束功率阈值之上发生界面破裂。这种不对称性源于变形界面处光的全反射条件的发生。界面不稳定性导致形成固定的，以射束为中心的，以液滴为中心的液体微射流。辐射诱发的喷射还会导致宽高比高达100的可调谐液体色谱柱，即远超出基本的Rayleigh-Plateau限制。因此，光流体动力学界面不稳定性的应用范围很广，从适应性的微光学（诱导柱的透镜和光导）到微流控和微喷涂，因为对流体的传输进行了光学监控和控制，分为三个阶段尺寸。

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