Details

Autor(en) / Beteiligte

• Christinck, J.
• Hirt, F.
• Hofer, H.
• Liu, Z.
• Etzkorn, M.
• Dunatov, T.
• Jakšić, M.
• Forneris, J.
• Kück, S.

Titel

Bright single-photon emission from a GeV center in diamond under a microfabricated solid immersion lens at room temperature

Ist Teil von

• Journal of applied physics, 2023-05, Vol.133 (19)

Ort / Verlag

Melville: American Institute of Physics

Erscheinungsjahr

2023

Link zum Volltext

Quelle

AIP Journals Complete

Beschreibungen/Notizen

• We report on the metrological characterization of the emission from a germanium-vacancy center in diamond under a microfabricated solid immersion lens in a confocal laser-scanning microscope setup. Ge ions were implanted into a synthetic diamond at 3 MeV, and germanium-vacancy centers were then formed by subsequent annealing. Afterward, solid immersion lenses were fabricated in a focused ion beam scanning electron microscope. The photoluminescence was investigated at room temperature in terms of the spectral distribution, the excited state lifetime, the second-order correlation function, and the saturation behavior, proving simultaneous high single-photon purity and high brightness. Two methods were exploited to minimize the residual multi-photon probability: spectral filtering and temporal filtering. According to these results, we assume that Raman scattered photons and emission from neighboring color centers play an important role in the residual multi-photon emission probability. The system efficiency of the single-photon source was investigated and found to be in accordance with the value calculated from all sources of loss in the setup. The branching ratio of the germanium-vacancy center for the decay into the ground state and into metastable state was calculated. The results enable the usage of the single-photon source in future quantum radiometric experiments.