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Light transport and rotational diffusion in optically anisotropic colloidal suspensions

Light transport and rotational diffusion in optically anisotropic colloidal suspensions

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SANDOMIRSKI, Kirill, 2006. Light transport and rotational diffusion in optically anisotropic colloidal suspensions [Dissertation]. Konstanz: University of Konstanz

@phdthesis{Sandomirski2006Light-8865, title={Light transport and rotational diffusion in optically anisotropic colloidal suspensions}, year={2006}, author={Sandomirski, Kirill}, address={Konstanz}, school={Universität Konstanz} }

Light transport and rotational diffusion in optically anisotropic colloidal suspensions We have investigated for the first time the influence of magnetic field on rotational diffusion in anisotropic colloidal suspensions by the method of diffusing wave spectroscopy. It has been established that the change of static properties of the sample in magnetic field exceeds the influence of rotational Brawnian motion of colloidal particles.<br /><br />The main dependencies of magnitude and direction of a magnetic field B on anisotropic diffusion of light has been established. It has been shown that in the case of light propagation perpendicular to the magnetic field the intensity of diffuse light increases with the field B and saturates at the fields 5-7 Tesla. The degree of saturation is more pronounced for higher concentrations of colloidal suspensions. At the same time the ellipticity increases. It was found that in this geometry the diffuse light becomes polarized in direction parallel to field B, independent of the initial polarization of the laser beam. In the case of light propagation parallel to the magnetic field the intensity of diffuse light decreases with the field B and saturates at the field 5-7 Tesla. Again, the degree of saturation is more pronounced for higher concentrations of colloidal suspensions. In this geometry the diffuse light is completely depolarized at all values of the magnetic field. 2006 terms-of-use Lichttransport und Rotationsdiffusion in optisch anisotropen kolloidalen Suspensionen Sandomirski, Kirill 2011-03-24T17:51:09Z 2011-03-24T17:51:09Z eng application/pdf Sandomirski, Kirill

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