Géraldine Dantelle

Surface-induced charge state conversion of nitrogen-vacancy defects in nanodiamonds

We present a study of the charge state conversion of single nitrogen-vacancy (NV) defects hosted in nanodiamonds (NDs). We first show that the proportion of negatively charged

Nanoscale magnetic field mapping with a single spin scanning probe magnetometer

{\text{NV}}^{\ensuremath{-}}

Nucleation efficiency of erbium and ytterbium fluorides in transparent oxyfluoride glass-ceramics

defects, with respect to its neutral counterpart

Spin relaxometry of single nitrogen-vacancy defects in diamond nanocrystals for magnetic noise sensing

{\text{NV}}^{0}

Influence of the Internalization Pathway on the Efficacy of siRNA Delivery by Cationic Fluorescent Nanodiamonds in the Ewing Sarcoma Cell Model

, decreases with the size of the ND. We then propose a simple model based on a layer of electron traps located at the ND surface which is in good agreement with the recorded statistics. By using thermal oxidation to remove the shell of amorphous carbon around the NDs, we demonstrate a significant increase in the proportion of

Photophysics of single nitrogen-vacancy centers in diamond nanocrystals

{\text{NV}}^{\ensuremath{-}}

Luminescence thermochromism of acrylic materials incorporating copper iodide clusters

defects in 10 nm NDs. These results are invaluable for further understanding, control, and use of the unique properties of negatively charged NV defects in diamond.

A Solid‐State Effect Responsible for an Organic Quintet State at Room Temperature and Ambient Pressure

We demonstrate quantitative magnetic field mapping with nanoscale resolution, by applying a lock-in technique on the electron spin resonance frequency of a single nitrogen-vacancy defect placed at the apex of an atomic force microscope tip. In addition, we report an all-optical magnetic imaging technique which is sensitive to large off-axis magnetic fields, thus extending the operation range of diamond-based magnetometry. Both techniques are illustrated by using a magnetic hard disk as a test sample. Owing to the non-perturbing and quantitative nature of the magnetic probe, this work should open up numerous perspectives in nanomagnetism and spintronics.

Quantum plasmonics: Second-order coherence of surface plasmons launched by quantum emitters into a metallic film

Oxyfluoride glasses (GeO 2 –PbO–PbF 2 ) doped with erbium and/or ytterbium fluorides were prepared. Highly transparent glass-ceramics, containing β–PbF 2 nanocrystallites, were successfully obtained by controlled glass devitrification and were studied as they could lead to promising optical applications. To characterize the samples, differential thermal analysis, x-ray diffraction, and transmission electron microscopy were performed, revealing a variation of the crystallites size, the crystallites number and β–PbF 2 crystallization temperature according to the doping ion. Indeed, the analyses indicated differences between erbium and ytterbium fluorides in promoting the crystallization of the fluoride phase. Although both fluorides act as seeds for β–PbF 2 heterogeneous nucleation, erbium fluoride has higher nucleation efficiency than ytterbium fluoride and runs the nucleation process in co-doped samples. Energy dispersive x-ray microanalysis insured high rare-earth segregation into the crystallites, proving the formation of a solid solution Pb 1− x−y Er x Yb y F 2 + x + y , also confirmed by the unit cell parameter study.

Plasmon-induced modification of fluorescent thin film emission nearby gold nanoparticle monolayers.

We report an experimental study of the longitudinal relaxation time (