Optically detected magnetic resonance with an open source platform

Babashah, Hossein; Shirzad, Hoda; Losero, Elena; Goblot, Valentin; Galland, Christophe; Chipaux, Mayeul

doi:10.21468/scipostphyscore.6.4.065

Cited by 5 publications

(2 citation statements)

References 140 publications

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“…We acquired continuous wave ODMR spectra in our home-made confocal microscope. More details on the set-up can be found in [53]. We used a permanent magnet to lift the zero-field splitting degeneracy and address a single transition.…”

Section: Extremely High Energy Electron Irradiationmentioning

confidence: 99%

“…We use the standard all-optical measurement protocol, reported for example in ref. [53]: a first laser pulse is used to polarize the NV − , a second pulse allows to read out the spin state after a variable time delay 𝜏. T 1 is obtained by fitting the decay of readout PL versus 𝜏 with a single exponential function. In Figure 7d, the extracted T 1 values at different distances from the maximally irradiated region are reported.…”

Section: Extremely High Energy Electron Irradiationmentioning

confidence: 99%

See 1 more Smart Citation

Creation of NV Centers in Diamond under 155 MeV Electron Irradiation

Losero,

Goblot,

Zhu

et al. 2023

Advanced Physics Research

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Single‐crystal diamond substrates presenting a high concentration of negatively charged nitrogen‐vacancy centers (NV−) are on high demand for the development of optically pumped solid‐state sensors such as magnetometers, thermometers, or electrometers. While nitrogen impurities can be easily incorporated during crystal growth, the creation of vacancies requires further treatment. Electron irradiation and annealing is often chosen in this context, offering advantages with respect to irradiation by heavier particles that negatively affect the crystal lattice structure and consequently the NV− optical and spin properties. A thorough investigation of electron irradiation possibilities is needed to optimize the process and improve the sensitivity of NV‐based sensors. In this work, the effect of electron irradiation is examined in a previously unexplored regime: extremely high energy electrons, at 155 MeV. A simulation model is developed to estimate the concentration of created vacancies and an increase of NV− concentration by more than three orders of magnitude following irradiation of a nitrogen‐rich HPHT diamond over a very large sample volume is experimentally demonstrated, which translates into an important gain in sensitivity. Moreover, the impact of electron irradiation in this peculiar regime on other figures of merits relevant for NV sensing is discussed, including charge state conversion efficiency and spin relaxation time. Finally, the effect of extremely high energy irradiation is compared with the more conventional low energy irradiation process, employing 200 keV electrons from a transmission electron microscope, for different substrates and irradiation fluences, evidencing 60‐fold higher yield of vacancy creation per electron at 155 MeV.

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Section: Extremely High Energy Electron Irradiationmentioning

confidence: 99%

Section: Extremely High Energy Electron Irradiationmentioning

confidence: 99%

Creation of NV Centers in Diamond under 155 MeV Electron Irradiation

Losero,

Goblot,

Zhu

et al. 2023

Advanced Physics Research

Self Cite

View full text Add to dashboard Cite

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Diamond Surfaces with Lateral Gradients for Systematic Optimization of Surface Chemistry for Relaxometry – a Low-Pressure Plasma-Based Approach

Tian,

Ortiz Moreno,

Chipaux

et al. 2024

Langmuir

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Diamond is increasingly popular because of its unique material properties. Diamond defects called nitrogen vacancy (NV) centers allow for measurements with unprecedented sensitivity. However, to achieve ideal sensing performance, NV centers need to be within nanometers from the surface and are thus strongly dependent on the local surface chemistry. Several attempts have been made to compare diamond surfaces. However, due to the high price of diamond crystals with shallow NV centers, a limited number of chemical modifications have been studied. Here, we developed a systematic method to investigate the continuity of different local environments with varying densities and natures of surface groups in a single experiment on a single diamond plate. To achieve this goal, we used diamonds with a shallow ensemble of NV centers and introduced a chemical gradient across the surface. More specifically, we used air and hydrogen plasma. The gradients were formed by a low-pressure plasma treatment after masking with a rightangled triangular prism shield. As a result, the surface contained gradually more oxygen/ hydrogen toward the open end of the shield. We then performed wide-field relaxometry to determine the effect of surface chemistry on the sensing performance. As expected, relaxation times and thus sensing performance indeed vary along the gradient.

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Neuronal growth on high-aspect-ratio diamond nanopillar arrays for biosensing applications

Losero

Jagannath

Pezzoli

et al. 2023

Sci Rep

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Monitoring neuronal activity with simultaneously high spatial and temporal resolution in living cell cultures is crucial to advance understanding of the development and functioning of our brain, and to gain further insights in the origin of brain disorders. While it has been demonstrated that the quantum sensing capabilities of nitrogen-vacancy (NV) centers in diamond allow real time detection of action potentials from large neurons in marine invertebrates, quantum monitoring of mammalian neurons (presenting much smaller dimensions and thus producing much lower signal and requiring higher spatial resolution) has hitherto remained elusive. In this context, diamond nanostructuring can offer the opportunity to boost the diamond platform sensitivity to the required level. However, a comprehensive analysis of the impact of a nanostructured diamond surface on the neuronal viability and growth was lacking. Here, we pattern a single crystal diamond surface with large-scale nanopillar arrays and we successfully demonstrate growth of a network of living and functional primary mouse hippocampal neurons on it. Our study on geometrical parameters reveals preferential growth along the nanopillar grid axes with excellent physical contact between cell membrane and nanopillar apex. Our results suggest that neuron growth can be tailored on diamond nanopillars to realize a nanophotonic quantum sensing platform for wide-field and label-free neuronal activity recording with sub-cellular resolution.

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Optically detected magnetic resonance with an open source platform

Cited by 5 publications

References 140 publications

Creation of NV Centers in Diamond under 155 MeV Electron Irradiation

Creation of NV Centers in Diamond under 155 MeV Electron Irradiation

Diamond Surfaces with Lateral Gradients for Systematic Optimization of Surface Chemistry for Relaxometry – a Low-Pressure Plasma-Based Approach

Neuronal growth on high-aspect-ratio diamond nanopillar arrays for biosensing applications

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