3 research outputs found
Enhanced Spectral Density of a Single Germanium Vacancy Center in a Nanodiamond by Cavity-Integration
Color centers in diamond, among them the negatively-charged germanium vacancy
(GeV), are promising candidates for many applications of quantum optics
such as a quantum network. For efficient implementation, the optical
transitions need to be coupled to a single optical mode. Here, we demonstrate
the transfer of a nanodiamond containing a single ingrown GeV- center with
excellent optical properties to an open Fabry-P\'erot microcavity by
nanomanipulation utilizing an atomic force microscope. Coupling of the GeV-
defect to the cavity mode is achieved, while the optical resonator maintains a
high finesse of F = 7,700 and a 48-fold spectral density enhancement is
observed. This article demonstrates the integration of a GeV- defect with a
Fabry-P\'erot microcavity under ambient conditions with the potential to extend
the experiments to cryogenic temperatures towards an efficient spin-photon
platform.Comment: 6 pages, 3 figures. The article has been accepted by Applied Physics
Letters. It is found at https://doi.org/10.1063/5.0156787. Added
acknowledgment: S.S. acknowledges support of the Marie Curie ITN project
LasIonDef (GA n.956387
Spectral Emission Dependence of Tin‐Vacancy Centers in Diamond from Thermal Processing and Chemical Functionalization
We report a systematic photoluminescence (PL) investigation of the spectral
emission properties of individual optical defects fabricated in diamond upon
ion implantation and annealing. Three spectral lines at 620 nm, 631 nm, and 647
nm are identified and attributed to the SnV center due to their occurrence in
the PL spectra of the very same single-photon emitting defects. We show that
the relative occurrence of the three spectral features can be modified by
oxidizing the sample surface following thermal annealing. We finally report the
relevant emission properties of each class of individual emitters, including
the excited state emission lifetime and the emission intensity saturation
parameters.Comment: 12 pages, 6 figures, 1 tabl
Efficiency Optimization of Ge-V Quantum Emitters in Single-Crystal Diamond upon Ion Implantation and HPHT Annealing
The authors report on the characterization at the single-defect level of germanium-vacancy (GeV) centers in diamond produced upon Ge− ion implantation and different subsequent annealing processes, with a specific focus on the effect of high-pressure-high-temperature (HPHT) processing on their quantum-optical properties. Different post-implantation annealing conditions are explored for the optimal activation of GeV centers, namely, 900 °C 2 h, 1000 °C 10 h, 1500 °C 1 h under high vacuum, and 2000 °C 15 min at 6 GPa pressure. A systematic analysis of the relevant emission properties, including the emission intensity in saturation regime and the excited state radiative lifetime, is performed on the basis of a set of ion-implanted samples, with the scope of identifying the most suitable conditions for the creation of GeV centers with optimal quantum-optical emission properties. The main performance parameter adopted here to describe the excitation efficiency of GeV centers as single-photon emitters is the ratio between the saturation optical excitation power and the emission intensity at saturation. The results show an up to eightfold emission efficiency increase in HPHT-treated samples with respect to conventional annealing in vacuum conditions, suggesting a suitable thermodynamic pathway toward the repeatable fabrication of ultra-bright GeV centers for single-photon generation purposes