Experimental investigation of the interaction of high-power laser radiation with the free surface of a liquid under total internal reflection conditions

Ivanova, O. N.; Чернов, С. П.; Shepelev, V. A.

doi:10.1070/qe1975v004n09abeh011593

Cited by 2 publications

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“…It should be noticed that this enhancement of the optical radiation pressure under total reflection condition was exploited by Komissarova et al in their experiments [3], and also in Ref. 22. Let us note that in our situation n 1 and n 2 are very close, due to the vicinity of the critical point.…”

Section: Dependence On Polarization and On Angle Of Incidencesupporting

confidence: 67%

Asymmetric optical radiation pressure effects on liquid interfaces under intense illumination

2003

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Deformations of horizontal liquid interfaces by optical radiation pressure are generally expected to display similar behaviors whatever the direction of propagation of the exciting laser beam is. In the present experiment we find this expectation to be borne out, as long as the cw laser illumination is moderate in strength. However, as a striking contrast in the case of high field strengths, we find that either a large stable tether can be formed, or else that a break-up of the interface can occur, depending on whether the laser beam is upward or downward directed. Physically, the reason for this asymmetry can be traced to whether total reflection can occur or not. We also present two simple theoretical models, one based on geometrical optics, the other on wave optics, that are able to illustrate the essence of the effect. In the case leading to interface disruption our experimental results are compared with those obtained by Zhang and Chang for water droplets under intense laser pulses [Opt. Lett. 13, 916 (1988)]. A key point in our experimental investigations is to work with a near-critical liquid/liquid interface. The surface tension becomes therefore significantly reduced, which thus enhances the magnitude of the stationary deformations induced.

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Section: Dependence On Polarization and On Angle Of Incidencesupporting

confidence: 67%

Asymmetric optical radiation pressure effects on liquid interfaces under intense illumination

2003

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Laser microfluidics: fluid actuation by light

Delville¹,

Vincent²,

Schroll³

et al. 2009

J. Opt. A: Pure Appl. Opt.

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The development of microfluidic devices is still hindered by the lack of robust fundamental building blocks that constitute any fluidic system. An attractive approach is optical actuation because light field interaction is contactless and dynamically reconfigurable, and solutions have been anticipated through the use of optical forces to manipulate microparticles in flows. Following the concept of "optical chip" advanced from the optical actuation of suspensions, we propose in this survey new routes to extend this concept to microfluidic two-phase flows. First, we investigate the destabilization of fluid interfaces by the optical radiation pressure and the formation of liquid jets. We analyze the droplet shedding from the jet tip and the continuous transport in laser-sustained liquid channels. In a second part, we investigate a dissipative light-flow interaction mechanism consisting in heating locally two immiscible fluids to produce thermocapillary stresses along their interface. This opto-capillary coupling is implemented in adequate microchannel geometries to manipulate two-phase flows and propose a contactless optical toolbox including valves, droplet sorters and switches, droplet dividers or droplet mergers. Finally, we discuss radiation pressure and opto-capillary effects in the context of the "optical-chip" where flows, channels and operating functions would all be performed optically on the same device.

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Experimental investigation of the interaction of high-power laser radiation with the free surface of a liquid under total internal reflection conditions

Cited by 2 publications

References 0 publications

Asymmetric optical radiation pressure effects on liquid interfaces under intense illumination

Asymmetric optical radiation pressure effects on liquid interfaces under intense illumination

Laser microfluidics: fluid actuation by light

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