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Optique non linéaire quadratique et cubique des nanoparticules d'or uniques

Abstract : The manuscript reports a study about the quadratic and cubic nonlinear optical response from gold metallic nanostructures which are deposited onto substrates. The field of this work is more commonly known as nonlinear plasmonics and it consists in trying to understand the interaction between nanostructures and light, in a regime of high incident intensities when the response is no longer linear. The local electromagnetic field enhancement in these structures due to the surface plasmon resonance, the latters being collectives excitations of the conduction band electrons, increase drastically the cross-section for these processes. In the context of a quadratic response, the study has been focused on the Second Harmonic Generation (SHG) process whereby two incident photons at the fundamental wavelength are converted into one photon at twice the harmonic frequency. This process is highly dependent to the metallic nanostructures morphology. For the cubic response, the study has been focused on the optical Kerr effect which describes the optical index variation of nanostructure with the intensity of the incident wave.Specifics considerations have been taken into account about the geometrical illumination conditions which are performed with a large numerical aperture. The electromagnetic incident field cannot be anymore considered within the paraxial approximation
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Emeric Bergmann. Optique non linéaire quadratique et cubique des nanoparticules d'or uniques. Optique [physics.optics]. Université Claude Bernard - Lyon I, 2015. Français. ⟨NNT : 2015LYO10291⟩. ⟨tel-01325640⟩

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