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Cohérence dans les systèmes métal/organique en couplage fort : états étendus et métasurfaces

Abstract : This experimental thesis focuses on the manipulation and control of hybrid plasmon/exciton states. These states, called polaritons, build on the strong light/matter interaction. The strong coupling regime induces collective effects and coherence, by coupling emitters spatially separated and otherwise independents. The work conducted in this thesis aims to control and handle the spatial extension of the coherent states in order to create novel materials. Two approaches are exploited to impact the light/matter interaction. The first method is based on the improvement of the optical mode: we demonstrated the strong interaction between organic semiconductor (J-aggregate) excitons and long-range surface plasmons. This plasmonic mode allows to enhanced the extension of the coherent domain up to 50 µm. The second method acts on the active material. We evidenced a new type of metasurface based on a structuration of the excitonic layer at the micrometer scale: smaller than the coherent length but significantly larger than the wavelength. The typical metasurface effects, such as effective behavior and geometry sensitivity are highlighted. We use this feature to tailor the band structure and generate an important anisotropic effect associated with the geometry of the structuration, leading to controlled emission polarization
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Submitted on : Tuesday, February 18, 2020 - 1:26:20 PM
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  • HAL Id : tel-02482524, version 2



Kevin Chevrier. Cohérence dans les systèmes métal/organique en couplage fort : états étendus et métasurfaces. Physique [physics]. Université de Lyon, 2019. Français. ⟨NNT : 2019LYSE1235⟩. ⟨tel-02482524v2⟩