Giant optical non-linearities of critical micro-emulsions

Freysz, É.; Afifi, Mohamed; Ducasse, A.; Pouligny, B.; Lalanne, J. R.

doi:10.1051/jphyslet:01985004605018100

Cited by 25 publications

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“…From the physical parameters go =11 A [12] and ri=3.41X10 Pas [16] one gets ED=0.62 at To=297. 5 K, in good agreement with theoretical predictions [20]. %e finally focus on the mechanism inducing the quench in composition.…”

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confidence: 75%

“…In confined geometry avoiding the presence of walls, original behaviors are then expected and deserve to be analyzed. Laser-induced phase separation could lead to such a situation.Since the pioneer work of Ashkin on trapping and levitation of particles with a strongly focused laser beam [4], it has been shown that laser waves are able to locally modulate the particle density and hence to change the composition of any mixture whose components have different refractive indices [5]. Physically two different mechanisms account for such concentration variations.…”

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confidence: 99%

“…The generalization of this process to other mixtures (especially in nucroemulsions in which electrostriction is dominant [5]) and a detailed description of the droplet growth are actually in progress.…”

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Phase separation and droplet nucleation induced by an optical piston

et al. 1994

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We propose to use laser-induced concentration variations due to electrostrictive or thermodiffusive coupling in order to drive a phase separation in a liquid mixture. The properties of such a composition quench, analyzed in a microemulsion in the thermodiffusive case, are reported. Droplets of the minority phase are nucleated and trapped in the laser beam, and their dynamics is described. This experiment allows one to analyze nucleation in an original wetting-free one-dimensional geometry.PACS number(s): 64.70.Ja, 05.70.Fh, 42.65.Jx, 82.70.Kj In the last few years, phase separation processes have been extensively analyzed from both theoretical and experimental viewpoints [1]. Generally, dynamics and pattern evolutions of phase separation in liquid mixtures are strongly dependent on quench conditions and on geometrical confinement of the medium. Thus, difFerent phase separation behaviors are expected according to the type of quench procedure, which can involve variations of temperature, pressure [2], or composition. However, to our knowledge, no quench induced by composition variations has so far been reported. On the other hand, the domain growth is strongly influenced by gravity-induced flows occuring in the bulk, which increase the complexity of the pattern dynamics. In classical walls-confined geometry, this problem is partially eliminated but wetting processes start playing a crucial role [3]. In confined geometry avoiding the presence of walls, original behaviors are then expected and deserve to be analyzed. Laser-induced phase separation could lead to such a situation.Since the pioneer work of Ashkin on trapping and levitation of particles with a strongly focused laser beam [4], it has been shown that laser waves are able to locally modulate the particle density and hence to change the composition of any mixture whose components have different refractive indices [5]. Physically two different mechanisms account for such concentration variations. The first one is due to electrostrictive forces, which originate from the coupling of the dipole moment induced by the field on each particle, with the gradient of this field [6]. Besides, even a small wave-generated temperature gradient results in a concentration gradient due to thermodiffusion [7]. These concentration variations, which are responsible of large optical nonlinearities in some systems [8], could also allow one to induce phase transitions in a one-dimensional (1D) confined geometry.%'e describe in this work this laser-induced quench in composition and we analyze the resulting phase separation in a micellar phase of microemulsion.A simple description of this type of transition induced by low power lasers can be obtained by considering the interaction of the wave with a binary liquid system. We assume a mixture initially located close to a coexistence curve in the one-phase part of the phase diagram, as shown in Fig. l. Its evolution in the presence of the wave is presented in the plane (C, II) where C is the concentration of one of the components and...

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Phase separation and droplet nucleation induced by an optical piston

et al. 1994

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“…Colloidal suspensions that contain nanoparticles, also known as nanofluids, have found a variety of important applications in modern technologies [5]. For example, magnetic fluids are largely used for polishing optical components [6,7], suspensions of silica particles in liquid crystals have exhibited extraordinary capabilities for optical storage [8,9], and artificial media with a high optical nonlinearity were obtained in colloids of submicrometer-size particles in liquids [10][11][12][13]. As shown in recent studies [14][15][16][17][18][19][20][21], the liquid-phase environment of dispersed nanoparticles of wide bandgap semiconductors or insulators is very effective for a number of nonlinear optical effects.…”

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Electrostrictive Mechanism of Radiation Self-Action in Nanofluids

Livashvili

Криштоп

Yakunina

2013

Advances in Condensed Matter Physics

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The electrostriction mechanism of beam self-focusing in nanofluids is theoretically investigated. An analytical solution of the diffusion equation, which describes the dynamics of particles in nanofluids, was obtained and studied. Explicit expressions for the nonlinear part of the refractive index and concentration lens focal length are presented. It is shown that there is a limit on the radiation intensity associated with the physical and hydrodynamic characteristics of the phenomena in these processes.

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“…At the focal plane its electric field is described by: (13) and, for the original beam size W 1 , we have W 1 =2 10 2 µmλ is the light wavelength. At the focal plane its electric field is described by: (13) and, for the original beam size W 1 , we have W 1 =2 10 2 µmλ is the light wavelength.…”

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Noncritical microemulsion as nonlinear optical material

Vicari

Barone

2002

Nonlinear Spectroscopy

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Water in oil microemulsions are systems of spherical droplets of water coated by a monolayer of surfactant molecules, immersed in oil. Initially we have studied the optical nonlinear behavior of water in oil microemulsion by the Self-Phase-Modulation of a gaussian laser beam by an optically thin film. The material is WAD (water/AOT/decane, where AOT denotes sodium-bis-di-ethyl-sulfosuccinate) far from critical points and near the percolative transition from electrically insulating to electrically conducting. We have observed optical nonlinearity in the L2 area of the phase diagram, near the percolation line and far from the one-phase two-phase boundary line. In this point, the material turbidity is very low. Strong optical nonlinearity has been reported. Nonlinear optical effects in a Water/AOT/Decane (WAD) microemulsion have been experimentally studied also in a pump probe configuration. We detect the variation of the on axis optical intensity of the probe beam as generated by the concentration profile induced in an optically thin film of microemulsion by the pump beam. Results seem to suggest the hypothesis of a chain like shape of the clusters.

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Giant optical non-linearities of critical micro-emulsions

Cited by 25 publications

References 10 publications

Phase separation and droplet nucleation induced by an optical piston

Phase separation and droplet nucleation induced by an optical piston

Electrostrictive Mechanism of Radiation Self-Action in Nanofluids

Noncritical microemulsion as nonlinear optical material

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