Sunniva Indrehus, doctorante dans l’équipe Oxydes en basses dimensions, soutient sa thèse vendredi 18 septembre 2020 à 14 h.
Sorbonne Université - Campus Pierre et Marie Curie - Paris, France - Amphithéâtre Charpak
Plasmonic properties of supported nanoparticles
Abstract
The GranFilm toolbox aims at linking the morphology to the optical properties of granular thin films with particle islands in the form of truncated spheres or spheroids of sub-wavelength sizes (see Figure 1). By exploiting the excess field formalism in the non-retarded limit all the linear Fresnel coefficients of the film can be calculated from the polarizability tensor of the particles. The tensor is obtained through a multipole expansion of the scalar potential that can describe the anisotropic response in the directions normal and parallel to the substrate. While already used to understand in situ growth from the plasmonic response of equally sized particles, the introduction of pair correlation functions of islands randomly distributed on the lattice extends the toolbox’s capabilities. Systems of polydisperse particles can now be described with GranFilm, a more realistic situation from an experimental point of view.
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Figure 1 : Principal sketch of a system containing polydisperse par ticles under the influ- ence of an electromagnetic field. Each particle in the ensemble are defined by their individual geometry parameters. These are given by the distance from the center of the particle to substrate (d) and the particle radius (R). |
Jury
- M. Lionel Simonot, Maître de Conférence HDR, Université Poitiers, Rapporteur
- M. Gabriel Soriano, Maître de Conférence HDR, Instute Fresnel, Rapporteur
- Mme Nathalie Destouches, Professeure, Université Lyon, Examinatrice
- Mme Agnès Maître, Professeure, Sorbonne Université, Examinatrice
- M. Ingve Simonsen, Professeur, SGR Paris et NTNU Norvège, Directeur de thèse
- M. Rémi Lazzari, Directeur de recherche CNRS, INSP Codirecteur de thèse
- Mme Iryna Gozhyk, Ingénieure R&D, SGR Paris, Encadrante invitée