8 research outputs found
Optical properties of silicon-implanted polycrystalline diamond membranes
We investigate the optical properties of polycrystalline diamond membranes
containing silicon-vacancy (SiV) color centers in combination with other
nano-analytical techniques. We analyze the correlation between the Raman
signal, the SiV emission, and the background luminescence in the crystalline
grains and in the grain boundaries, identifying conditions for the
addressability of single SiV centers. Moreover, we perform a scanning
transmission electron microscopy (STEM) analysis, which associates the
microscopic structure of the membranes and the evolution of the diamond crystal
along the growth direction with the photoluminescence properties, as well as a
time-of-flight secondary ion mass spectrometry (ToF-SIMS) to address the
distribution of silicon in implanted and un-implanted membranes. The results of
the STEM and ToF-SIMS studies are consistent with the outcome of the optical
measurements and provide useful insight into the preparation of polycrystalline
samples for quantum nano-optics.Comment: 21 pages, 8 figure
Scalable creation of silicon-vacancy color centers in diamond by ion implantation through a 1-m pinhole
The controlled creation of quantum emitters in diamond represents a major
research effort in the fabrication of single-photon devices. Here, we present
the scalable production of silicon-vacancy (SiV) color centers in
single-crystal diamond by ion implantation. The lateral position of the SiV is
spatially controlled by a 1-m pinhole placed in front of the sample, which
can be moved nanometer precise using a piezo stage. The initial implantation
position is controlled by monitoring the ion beam position with a camera.
Hereby, silicon ions are implanted at the desired spots in an area comparable
to the diffraction limit. We discuss the role of ions scattered by the pinhole
and the activation yield of the SiV color centers for the creation of single
quantum emitters.Comment: 11 pages, 4 figure
Photoluminescence of nitrogen-vacancy and silicon-vacancy color centers in phosphorus-doped diamond at room and higher temperatures
Phosphorus-doped diamond is relevant for applications in sensing,optoelectronics and quantum photonics, since the unique optical properties of color centers in diamond can be combined with the n-type conductivity attained by the
inclusion of phosphorus. Here, we investigate the photoluminescence signal of the nitrogen-vacancy and silicon-vacancy color centers in phosphorus-doped diamond as a function of temperature starting from ambient conditions up to about 100â—¦ Celsius, focusing on the zero-phonon line (ZPL). We find that the wavelength and width
of the ZPL of the two color centers exhibit a comparable dependence on temperature, despite the strong difference in the photoluminescence spectra. Moreover, the temperature sensitivity of the ZPL of the silicon-vacancy center is not significantly affected by phosphorus-doping, as we infer by comparison with silicon-vacancy centers in optical-grade single-crystal diamond
Photonic molecules with a tunable inter-cavity gap
Optical micro-resonators have broad applications. They are used, for example, to enhance light–matter interactions in optical sensors or as model systems for investigating fundamental physical mechanisms in cavity quantum electrodynamics. Coupling two or more micro-cavities is particularly interesting as it enlarges the design freedom and the field of application. In this context, achieving tunability of the coupling strength and hence the inter-cavity gap is of utmost importance for adjusting the properties of the coupled micro-resonator system. In this paper, we report on a novel coupling approach that allows highly precise tuning of the coupling gap of polymeric micro-resonators that are fabricated side by side on a common substrate. We structure goblet-shaped whispering-gallery-mode resonators on an elastic silicone-based polymer substrate by direct laser writing. The silicone substrate is mechanically stretched in order to exploit the lateral shrinkage to reduce the coupling gap. Incorporating a laser dye into the micro-resonators transforms the cavities into micro-lasers that can be pumped optically. We have investigated the lasing emission by micro-photoluminescence spectroscopy, focusing on the spatial localization of the modes. Our results demonstrate the formation of photonic molecules consisting of two or even three resonators, for which the coupling strengths and hence the lasing performance can be precisely tuned. Flexibility and tunability are key elements in future photonics, making our approach interesting for various photonic applications. For instance, as our coupling approach can also be extended to larger cavity arrays, it might serve as a platform for tunable coupled-resonator optical waveguide devices