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Désordre contrôlé sur des nanostructures métalliques pour des applications en plasmonique

Abstract : Metallic nanostructures allow to confine light at subwavelength scales by the excitation of surface plasmon. They open the way for many applications in imaging, photonic components development and quantum information. This thesis deals with the study of metallic nanostructures, semi-continuous or based on holes gratings with a controlled disorder, and their interaction with colloidal semiconductor nanocrystals that are very photostable. Combining several complementary experimental approaches (far-field spectroscopy, near-field optical microscopy, near-field active probe microscopy, characterization by confocal microscopy of the emission of nanocrystals coupled to the metallic surfaces), we were able to highlight specific characteristics of the plasmon modes of these different structures. For the gratings with a controlled disorder, we have in particular analyzed the emergence of intense localized modes and determined the influence of parameters such as the thickness of the gold layer, the diameter of the holes or the initial periodicity of the grating. The experimental results are in very good agreement with the numerical simulations carried out by FDTD.
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https://tel.archives-ouvertes.fr/tel-01777826
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Submitted on : Wednesday, April 25, 2018 - 10:19:09 AM
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Thi Phuong Lien Ung. Désordre contrôlé sur des nanostructures métalliques pour des applications en plasmonique. Gaz Quantiques [cond-mat.quant-gas]. Université Paris Saclay (COmUE), 2018. Français. ⟨NNT : 2018SACLV013⟩. ⟨tel-01777826⟩

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