M.Sc Student | Diamant Moshe |
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Subject | Effect of Polarization on Coherent Back Scattering |

Department | Department of Physics |

Supervisor | Professor Eric Akkermans |

Full Thesis text |

Coherent backscattering is an
interference phenomenon which appears in disordered systems with time reversal symmetry.
When illuminating such a medium with a monochromatic wave, the intensity
returned from the bulk after multiple scattering, is found to be doubled in the
backscattered direction with respect to the prediction of a theory which does
not take into consideration interference effects. This increase in the
scattered intensity apparently violates energy conservation. In this work we
consider a semi infinite geometry and a weakly disordered medium, which is
characterized by a dimensionless parameter kl_{0 } which is much
greater than 1, where k is the wave number of an incoming wave and l_{0 }is
the free mean path, i.e. the average distance between successive scatterings. A
perturbation theory was written for the scalar wave version of this problem which
explains the doubled intensity. Later it was shown that the violation of energy
conservation can also be solved by this theory. We extend the theory to show
that it satisfies energy conservation for polarized waves as well.