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Spectroscopie haute résolution d’ensembles de centres colorés du diamant pour des expériences d’optique quantique

Louis Nicolas 1, 2
2 Nano-Optique
LPENS (UMR_8023) - Laboratoire de physique de l'ENS - ENS Paris
Abstract : This dissertation presents the elaboration of an original atom-light interface in the solid-state: a half-cavity made out of a mirror and a high numerical aperture lens that allows control and more specifically enhancement of the lifetime of a dipole located at the focus of the lens. Such a system also allows strong interaction between the dipole and a highly focused field given that the field can be totally reflected by the dipole. Diamond colored centers are suitable artificial atoms as they exhibit outstanding optical properties. The major part of the work realized during this PhD was dedicated to the elaboration of an experimental platform to study photoluminescence properties of condensed matter systems in the visible domain at cryogenic temperatures and to find suitable emitters for an efficient atom-field interface. This set up allows us to characterize new samples as part of collaborations with teams specialized in diamond synthesis, in particular, SiV- and GeV- embedded in nanodiamonds synthesized by chemical vapor deposition. They exhibit sub-GHz linewidths which is very promising for quantum electrodynamics experiments. Optical properties of SiV- centers embedded in diamond nanopyramids have been extensively studied. Photochromism has been observed and allows us to measure the homogeneous linewidth of inhomogeneously broadened SiV- center ensembles. This linewidth is close to be lifetime limited.We try to explain this photochromism effect with different hypotheses corroborated by measurements. Finally, preliminary results have been obtained using a half-cavity. We show how the modification of the lifetime is measured when inhomogeneous broadening is present, by using another interferometer in addition to the half-cavity.
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Louis Nicolas. Spectroscopie haute résolution d’ensembles de centres colorés du diamant pour des expériences d’optique quantique. Physique [physics]. Université Paris sciences et lettres, 2019. Français. ⟨NNT : 2019PSLEE066⟩. ⟨tel-03185648⟩

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