Individual, luminescent point defects in solids so called color centers are atomic-sized quantum systems enabling sensing and imaging with nanoscale spatial resolution. In this overview, we introduce based on individual nitrogen vacancy (NV) diamond. We discuss two central challenges of the field: First, creation highly-coherent, shallow NV less than 10 nm below surface single-crystal Second, fabrication tip-like photonic nanostructures that enable efficient fluorescence collection can be...

Abstract Powered by the mutual developments in instrumentation, materials and theoretical descriptions, sensing imaging capabilities of quantum emitters solids have significantly increased past two decades. Quantum solids, whose properties resemble those atoms ions, provide alternative ways to probing natural artificial nanoscopic systems with minimum disturbance ultimate spatial resolution. Among emerging emitters, nitrogen vacancy (NV) color center diamond is an outstanding example due its...

We investigate native nitrogen vacancy (NV) and silicon (SiV) color centers in a commercially available, heteroepitaxial, wafer-sized, mm thick, single-crystal diamond. observe single, NV with density of roughly 1 per μm3 moderate coherence time (T2 = 5 μs) embedded an ensemble SiV centers. Using low temperature luminescence as probe, we prove the high crystalline quality diamond especially close to growth surface, consistent reduced dislocation density. ion implantation plasma etching,...

Individual nitrogen vacancy (NV) color centers in diamond are versatile, spin-based quantum sensors. Coherently controlling the spin of NV using microwaves a typical frequency range between 2.5 and 3.5 GHz is necessary for sensing applications. In this work, we present stripline-based, planar, Ω-shaped microwave antenna that enables one to reliably manipulate spins. We found an optimal design finite integral simulations. fabricated our antennas on low-cost, transparent glass substrate....

Abstract Energy transfer between fluorescent probes lies at the heart of many applications ranging from bio‐sensing and bio‐imaging to enhanced photodetection light harvesting. In this work, Förster resonance energy (FRET) shallow defects in diamond—nitrogen‐vacancy (NV) centers—and atomically thin, 2D materials—tungsten diselenide (WSe 2 )—is studied. By means fluorescence lifetime imaging, occurrence FRET WSe /NV system is demonstrated. Further, it shown that coupled system, NV centers...

Nitrogen-vacancy (NV) centers feature outstanding properties like a spin coherence time of up to one second as well level structure offering the possibility initialize, coherently manipulate and optically read-out degree freedom ground state. However, only about three percent their photon emission are channeled into zero phonon line (ZPL), limiting both rate indistinguishable single photons signal-to-noise ratio (SNR) coherent spin-photon interfaces. We here report on enhancement SNR optical...

We investigate bright fluorescence of nitrogen (NV)- and silicon-vacancy color centers in pyramidal, single crystal diamond tips, which are commercially available as atomic force microscope probes. coherently manipulate NV electronic spin ensembles with T2 = 7.7(3) μs. Color center lifetimes different tip heights indicate effective refractive index effects quenching. Using numerical simulations, we verify enhanced photon rates from emitters close to the pyramid apex rendering them promising...

We investigate the influence of plasma treatments, especially a 0 V-bias, potentially low damage O2 as well biased Ar/SF6/O2 on shallow, negative nitrogen vacancy (NV−) centers. ignite and sustain our 0 V-bias using purely inductive coupling. To this end, we pre-treat surfaces high purity chemical vapor deposited single-crystal diamond (SCD). Subsequently, create ∼10 nm deep NV− centers via implantation annealing. Onto annealed SCD surface, fabricate nanopillar structures that efficiently...

In this manuscript, we outline a reliable procedure to manufacture photonic nanostructures from single-crystal diamond (SCD). Photonic nanostructures, in our case SCD nanopillars on thin (<1 μ m) platforms, are highly relevant for nanoscale sensing. The presented top-down includes electron beam lithography (EBL) as well reactive ion etching (RIE). Our method introduces novel type of inter-layer, namely silicon, that significantly enhances the adhesion hydrogen silsesquioxane (HSQ) resist and...

Energy transfer between fluorescent probes lies at the heart of many applications ranging from bio-sensing and -imaging to enhanced photo-detection light harvesting. In this work, we study F\"orster resonance energy (FRET) shallow defects in diamond --- nitrogen-vacancy (NV) centers atomically-thin, two-dimensional materials tungsten diselenide (WSe$_2$). By means fluorescence lifetime imaging, demonstrate occurrence FRET WSe$_2$/NV system. Further, show that coupled system, NV provide an...

Nitrogen vacancy (NV) color centers in diamond form promising magnetic sensors due to stable photoluminescence (PL), optically readable spins and high coherence times even at ambient conditions. Either individual or ensembles of NV can be used; the first offering ultimate resolution down nanoscale [1]; latter enhanced sensitivity a gain PL signal [2].

We investigate native nitrogen (NV) and silicon vacancy (SiV) color centers in commercially available, heteroepitaxial, wafer-sized, mm thick, single-crystal diamond. observe single, NV with a density of roughly 1 per $μm^3$ moderate coherence time ($T_2 = 5 μs$) embedded an ensemble SiV centers. Low-temperature spectroscopy the zero phonon line fine structure witnesses high crystalline quality diamond especially close to growth surface, consistent reduced dislocation density. Using ion...

Individual nitrogen vacancy (NV) color centers in diamond are bright, photo-stable, atomic-sized dipole emitters [1]. Consequently, they represent optimal candidates for novel scanning near field microscopy techniques [2]. Here, NV form one member of a Forster Resonance Energy Transfer (FRET) pair. Due to their broadband emission (> 100 nm), NVs versatile donors FRET systems absorbing the infrared spectral range. Highly-promising applications include, e.g., nanoscale imaging fluorescent...

Individual nitrogen vacancy centers in diamond are versatile sensors for magnetic fields and optical near fields. We summarize our research on manufacturing scanning probes high spatial resolution imaging. optimize photonic properties of the probes, test different surface treatments routes towards upscaling probe fabrication.

We investigate the influence of plasma treatments, especially a 0V-bias, potentially low damage O$_2$ as well biased Ar/SF$_6$/O$_2$ on shallow, negative nitrogen vacancy (NV$^-$) centers. ignite and sustain using our 0V-bias purely inductive coupling. To this end, we pre-treat surfaces high purity chemical vapor deposited single-crystal diamond (SCD). Subsequently, create $\sim$10 nm deep NV$^-$ centers via implantation annealing. Onto annealed SCD surface, fabricate nanopillar structures...

Powered by the mutual developments in instrumentation, materials andtheoretical descriptions, sensing and imaging capabilities of quantum emitters insolids have significantly increased past two decades. Quantum insolids, whose properties resemble those atoms ions, provide alternative waysto probing natural artificial nanoscopic systems with minimum disturbance andultimate spatial resolution. Among emerging emitters, nitrogen-vacancy (NV) color center diamond is an outstanding example due to...

We present novel fabrication techniques for single crystal diamond nanostruc-tures containing shallow nitrogen vacancy color centers and their scalability. demonstrate near-field energy transfer between NV 2D materials multi-functional sensing capabilities of centers.

We summarize novel fabrication techniques and materials for single crystal diamond nanostructures containing shallow nitrogen vacancy color centers their scalability. demonstrate near-field energy transfer between NV 2D multi-functional sensing capabilities of centers.

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