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

Christinck, J.; Hirt, F.; Hofer, H.; Liu, Z.; Etzkorn, M.; Dunatov, Toni; Jakšić, Milko; Forneris, J.; Kück, S. (2023) Bright single-photon emission from a GeV center in diamond under a microfabricated solid immersion lens at room temperature. Journal of Applied Physics, 133 (19). ISSN 0021-8979

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Abstract

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.

Item Type:	Article
Uncontrolled Keywords:	Time-correlated single photon counting; Focused ion beam; Crystallographic defects; Diamond; Solid immersion lens; Scanning electron microscopy
Subjects:	NATURAL SCIENCES > Physics
Divisions:	Division of Experimental Physics
Projects:	Project title Project leader Project code Project type Potpora vrhunskim istraživanjima Centra izvrsnosti za napredne materijale i senzore- Mile Ivanda; Milko Jakšić; Mario Stipčević; Marko Kralj KK.01.1.1.01.0001 EK
Depositing User:	Josipa Karadžole
Date Deposited:	15 Apr 2026 11:13
URI:	http://fulir.irb.hr/id/eprint/11719
DOI:	10.1063/5.0150208

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