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Diffusion hyper Rayleigh des assemblages moléculaires

Abstract : The coherent character of the frequency doubling process, process of conversion of
two photons at the fundamental frequency into one photon at the harmonic frequency, makes it
possible to probe matter on sub-wavelength scales. To highlight this property, the technique of
hyper Rayleigh scattering was employed to probe the organization in molecular assemblies
dispersed in liquid solutions. After an initial study on a selection of solvents, the influence of
the environment on the response of the crystal violet, an octupolar probe molecule was studied.
These studies were carried on for amphiphilic molecular probes in order to study mixed
suspensions of free probes and probes incorporated in molecular assemblies, for instance
micelles. Because of the centrosymmetry of these assemblies, the dipolar component of the
scattered harmonic intensity vanishes, leaving a harmonic intensity dominated by the
quadripolar contribution. These measurements are performed with the technique of polarized
resolved hyper Rayleigh scattering. A complete model describing the various components of
the total harmonic intensity is introduced to describe the observations. In a final chapter,
preliminary studies on reconstituted biomimetic systems at the air-water interface by frequency
doubling are presented.
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https://tel.archives-ouvertes.fr/tel-00106415
Contributor : Guillaume Revillod <>
Submitted on : Monday, October 16, 2006 - 6:27:07 AM
Last modification on : Thursday, October 15, 2020 - 9:00:22 AM
Long-term archiving on: : Tuesday, April 6, 2010 - 7:40:35 PM

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Guillaume Revillod. Diffusion hyper Rayleigh des assemblages moléculaires. Physique Atomique [physics.atom-ph]. Université Claude Bernard - Lyon I, 2006. Français. ⟨tel-00106415⟩

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