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

authored by: J. Christinck, F. Hirt, H. Hofer, Z. Liu, M. Etzkorn, T. Dunatov, M. Jakšić, J. Forneris, S. Kück
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.
External Organisation(s): National Metrology Institute of Germany (PTB)
Technische Universität Braunschweig
Ruder Boskovic Institute
University of Turin
Type: Article
Journal: Journal of applied physics
Volume: 133
ISSN: 1089-7550
Publication date: 21.05.2023
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Physics and Astronomy(all)
Electronic version(s): https://doi.org/10.1063/5.0150208 (Access: Open)

BibTeX

@article{a692c97a71564fdba60123b6bb073779,
title = "Bright single-photon emission from a GeV center in diamond under a microfabricated solid immersion lens at room temperature",
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.",
author = "J. Christinck and F. Hirt and H. Hofer and Z. Liu and M. Etzkorn and T. Dunatov and M. Jak{\v s}i{\'c} and J. Forneris and S. K{\"u}ck",
note = "Funding Information: This work was funded by Project Nos. EMPIR 20FUN05 SEQUME and EMPIR 20IND05 QADeT. These projects have received funding from the EMPIR programme co-financed by the Participating States and from the European Union{\textquoteright}s 2020 research and innovation programme. This work was also funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany{\textquoteright}s Excellence Strategy—EXC 2123 QuantumFrontiers, Project No. 390837967. We gratefully acknowledge DFG support under Grant No. INST 188/452-1 FUGG, the support of the Braunschweig International Graduate School of Metrology B-IGSM and the DFG Research Training Group 1952 Metrology for Complex Nanosystems. We acknowledge financial support from the European Regional Development Fund for the “Center of Excellence for Advanced Materials and Sensing Devices” (Grant No. KK.01.1.1.01.0001).",
year = "2023",
month = may,
day = "21",
doi = "10.1063/5.0150208",
language = "English",
volume = "133",
journal = "Journal of applied physics",
issn = "1089-7550",
publisher = "American Institute of Physics",
number = "19",
}