44 research outputs found
Single Color Centers Implanted in Diamond Nanostructures
The development of materials processing techniques for optical diamond
nanostructures containing a single color center is an important problem in
quantum science and technology. In this work, we present the combination of ion
implantation and top-down diamond nanofabrication in two scenarios: diamond
nanopillars and diamond nanowires. The first device consists of a 'shallow'
implant (~20nm) to generate Nitrogen-vacancy (NV) color centers near the top
surface of the diamond crystal. Individual NV centers are then isolated
mechanically by dry etching a regular array of nanopillars in the diamond
surface. Photon anti-bunching measurements indicate that a high yield (>10%) of
the devices contain a single NV center. The second device demonstrates 'deep'
(~1\mu m) implantation of individual NV centers into pre-fabricated diamond
nanowire. The high single photon flux of the nanowire geometry, combined with
the low background fluorescence of the ultrapure diamond, allows us to sustain
strong photon anti-bunching even at high pump powers.Comment: 20 pages, 7 figure
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Single-Color Centers Implanted in Diamond Nanostructures
The development of material-processing techniques that can be used to generate optical diamond nanostructures containing a single-color center is an important problem in quantum science and technology. In this work, we present the combination of ion implantation and top-down diamond nanofabrication in two scenarios: diamond nanopillars and diamond nanowires. The first device consists of a 'shallow' implant (similar to 20 nm) to generate nitrogen-vacancy (NV) color centers near the top surface of the diamond crystal prior to device fabrication. Individual NV centers are then mechanically isolated by etching a regular array of nanopillars in the diamond surface. Photon anti-bunching measurements indicate that a high yield (> 10%) of the devices contain a single NV center. The second device demonstrates 'deep' (similar to ) implantation of individual NV centers into diamond nanowires as a post-processing step. The high single-photon flux of the nanowire geometry, combined with the low background fluorescence of the ultrapure diamond, allowed us to observe sustained photon anti-bunching even at high pump powers.Engineering and Applied SciencesPhysic
European Survey on Scholarly Practices and Digital Needs in the Arts and Humanities
This report summarizes the statistical analysis of the findings of a web-based survey conducted by the Digital Methods and Practices Observatory (DiMPO), a working group under VCC2 of the DARIAH research infrastructure (Digital Research Infrastructure for the Arts and Humanities).
In order to provide an evidence-based, up-to-date, and meaningful account of the emerging information practices, needs and attitudes of arts and humanities researchers in the evolving European digital scholarly environment, the web survey involved a transnational team of researchers from more than a dozen countries, and addressed digitally-enabled research practices, attitudes and needs in all areas of Europe and across different arts and humanities disciplines and contexts
Diamond optomechanical crystals
Cavity-optomechanical systems realized in single-crystal diamond are poised
to benefit from its extraordinary material properties, including low mechanical
dissipation and a wide optical transparency window. Diamond is also rich in
optically active defects, such as the nitrogen-vacancy (NV) and silicon-vacancy
(SiV) centers, which behave as atom-like systems in the solid state.
Predictions and observations of coherent coupling of the NV electronic spin to
phonons via lattice strain has motivated the development of diamond
nanomechanical devices aimed at realization of hybrid quantum systems, in which
phonons provide an interface with diamond spins. In this work, we demonstrate
diamond optomechanical crystals (OMCs), a device platform to enable such
applications, wherein the co-localization of ~ 200 THz photons and few to 10
GHz phonons in a quasi-periodic diamond nanostructure leads to coupling of an
optical cavity field to a mechanical mode via radiation pressure. In contrast
to other material systems, diamond OMCs operating in the resolved-sideband
regime possess large intracavity photon capacity (> 10) and sufficient
optomechanical coupling rates to reach a cooperativity of ~ 20 at room
temperature, allowing for the observation of optomechanically induced
transparency and the realization of large amplitude optomechanical
self-oscillations
Electrically Tunable Valley Dynamics in Twisted WSeâ/WSeâ Bilayers
The twist degree of freedom provides a powerful new tool for engineering the electrical and optical properties of van der Waals heterostructures. Here, we show that the twist angle can be used to control the spin-valley properties of transition metal dichalcogenide bilayers by changing the momentum alignment of the valleys in the two layers. Specifically, we observe that the interlayer excitons in twisted WSeâ/WSeâ bilayers exhibit a high (>60%) degree of circular polarization (DOCP) and long valley lifetimes (>40ââns) at zero electric and magnetic fields. The valley lifetime can be tuned by more than 3 orders of magnitude via electrostatic doping, enabling switching of the DOCP from âŒ80% in the n-doped regime to <5% in the p-doped regime. These results open up new avenues for tunable chiral light-matter interactions, enabling novel device schemes that exploit the valley degree of freedom