Contrôle de la fluorescence par des nanoantennes plasmoniques

Benjamin Habert 1
1 Laboratoire Charles Fabry / Naphel
LCF - Laboratoire Charles Fabry
Abstract : The present work focuses on the modification of spontaneous emission of fluorescent emitters using metallic nano-structures. These structures support confined plasmonic modes that strongly increase the local density of optical states. Consequently, the plasmonic structure enhances the spontaneous decay rate of the emitter. We use both numerical simulations and experimental results to demonstrate the potential of plasmonic antennas as tools to control spontaneous emission. First, we study a metal-dielectric-metal planar structure called patch antenna. This structure is coupled to an ensemble of quantumdots emitting visible light. We show that, in the presence of the patch antenna, the fluorescent emission is accelerated by a factor 80 and that its directivity is increased. Then, we use a similar plasmonic structure coupled to a quantum well emitting in the near infrared. Using an ad hoc hyperspectral imaging setup, we show that the antenna increases the extracted light by a factor 8. Finally, we study a spherical geometry composed of a single fluorescent quantum dot at the center of a silica bead coated with a thin gold shell. This plasmonic structure
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Benjamin Habert. Contrôle de la fluorescence par des nanoantennes plasmoniques. Optique [physics.optics]. Institut d’Optique Graduate School, 2014. Français. ⟨NNT : 2014IOTA0003⟩. ⟨pastel-01023199⟩

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