Measurement of liquid surface properties by laser-induced surface deformation spectroscopy

Sakai, Keiji; Mizuno, Daisuke; Takagi, Kenshiro

doi:10.1103/physreve.63.046302

Cited by 52 publications

(56 citation statements)

References 13 publications

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“…In order to get more reliable results, we extended to liquid-liquid interfaces a method used to quantitatively characterize laser beam self-focusing in nonlinear media [29], and more recently to measure surface tension at liquid free surfaces [27].…”

Section: Hump Curvature Dynamicsmentioning

confidence: 99%

“…Then, we used the focusing property of the interface hump [4] in the same way as Sakai et al [27] to measure the dynamics of the hump curvature along the beam axis κ(0, t). We present sequentially our measurements of both the hump height and curvature dynamics, and compare them to their prediction presented above.…”

Section: Measurement Of the Characteristic Timescale Of The In-tementioning

confidence: 99%

See 1 more Smart Citation

Light-induced deformation and instability of a liquid interface. II. Dynamics

2006

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We study the dynamics of the deformation of a soft liquid-liquid interface by the optical radiation pressure of a focused cw gaussian laser beam. We measured the temporal evolution of both the ranges, the small amplitude deformations are correctly described by a linear hydrodynamic theory predicting an overdamped dynamics. We also study the dynamics of the large amplitude interface deformations at the onset of the opto-hydrodynamic instability [Phys. Rev. Lett. 90, 144503 (2003)]. Using a simple, phenomenological model for the nonlinear evolution of the hump height, we interpret the observed interface dynamics at the instability onset as the signature of an imperfect subcritical instability.

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Section: Hump Curvature Dynamicsmentioning

confidence: 99%

Section: Measurement Of the Characteristic Timescale Of The In-tementioning

confidence: 99%

Light-induced deformation and instability of a liquid interface. II. Dynamics

2006

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“…For instance, a Japanese team exploited the bending of an interface by a laser wave to measure interfacial tensions [46] in a non-contact manner. In a second work [47], they focused their attention on the difficult case of ultra low interfacial tension, for which most of classical techniques fail.…”

Section: Mechanical Aspectsmentioning

confidence: 99%

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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“…However, non-invasive and non-perturbing methods are inevitably important for the characterization of phenomena that accompany the dynamics of soft-matter interfaces, especially convectional motions. Among the approaches available to measure interfacial tension, the frequency of capillary waves at an air/liquid or liquid/liquid interface can be measured using quasi-elastic laser scattering QELS method 24 27 or laser induced surface deformation spectroscopy 28 . QELS method is based on the angle-and frequency-resolved detection of light scattering by capillary waves, and enables the detection of interfacial tension by irradiation with laser light without contact probes.…”

Section: Interfacial Tension: a Long Range Interaction That Sustains mentioning

confidence: 99%