scholarly journals Monitoring Dark-State Dynamics of a Single Nitrogen-Vacancy Center in Nanodiamond by Auto-Correlation Spectroscopy: Photonionization and Recharging

Nanomaterials ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 979
Author(s):  
Mengdi Zhang ◽  
Bai-Yan Li ◽  
Jing Liu
Keyword(s):  
Laser Power ◽  
Time Course ◽  
Correlation Spectroscopy ◽  
Nitrogen Vacancy ◽  
Transition Time ◽  
Dark State ◽  
Auto Correlation ◽  
Nv Center ◽  
Photon Process ◽  
Nv Centers

In this letter, the photon-induced charge conversion dynamics of a single Nitrogen-Vacancy (NV) center in nanodiamond between two charge states, negative (NV−) and neutral (NV0), is studied by the auto-correlation function. It is observed that the ionization of NV− converts to NV0, which is regarded as the dark state of the NV−, leading to fluorescence intermittency in single NV centers. A new method, based on the auto-correlation calculation of the time-course fluorescence intensity from NV centers, was developed to quantify the transition kinetics and yielded the calculation of transition rates from NV− to NV0 (ionization) and from NV0 to NV− (recharging). Based on our experimental investigation, we found that the NV−-NV0 transition is wavelength-dependent, and more frequent transitions were observed when short-wavelength illumination was used. From the analysis of the auto-correlation curve, it is found that the transition time of NV− to NV0 (ionization) is around 0.1 μs, but the transition time of NV0 to NV− (recharging) is around 20 ms. Power-dependent measurements reveal that the ionization rate increases linearly with the laser power, while the recharging rate has a quadratic increase with the laser power. This difference suggests that the ionization in the NV center is a one-photon process, while the recharging of NV0 to NV− is a two-photon process. This work, which offers theoretical and experimental explanations of the emission property of a single NV center, is expected to help the utilization of the NV center for quantum information science, quantum communication, and quantum bioimaging.

NV-Diamond Magnetometer Using Electron Irradiation

2013 ◽  
Vol 1511 ◽  
Author(s):  
Edwin Kim ◽  
Victor M. Acosta ◽  
Erik Bauch ◽  
Dmitry Budker ◽  
Philip R. Hemmer
Keyword(s):  
Electron Spin ◽  
Electron Irradiation ◽  
Spin Transition ◽  
High Sensitivity ◽  
Future Generation ◽  
Nitrogen Vacancy ◽  
Logic Device ◽  
Wide Range ◽  
Nv Center ◽  
Nv Centers

ABSTRACTNitrogen-vacancy (NV) center in diamond is an emerging system for quantum-logic device and sensor applications. The key feature of the NV center is the ability of spin manipulation at room temperature. We apply a wide range of electron irradiation to generate the NV centers in nitrogen-rich diamond for creating best sensitivity. The NV0 and NV─ concentrations in electron irradiated diamond are determined from optical spectra. Additionally, electron spin resonance (ESR) has also proven to be an effective method for probing the electron spin transition between |ms=±1> and |ms=0> states of the NV centers. A study of ESR frequency shift and signal broadening and magnetometer sensitivity as a function of electron irradiation dose has been conducted. The research presented herein is a demonstration of minimum detectable magnetic field tailoring required for future-generation high-sensitivity diamond magnetometry.

scholarly journals Идентификация NV-центров в синтетических флуоресцентных наноалмазах и контроль дефектности кристаллитов методом электронного парамагнитного резонанса

2022 ◽  
Vol 130 (2) ◽  
pp. 332
Author(s):  
В.Ю. Осипов ◽  
К.В. Богданов ◽  
F. Treussart ◽  
A. Rampersaud ◽  
А.В. Баранов
Keyword(s):  
Surface Defects ◽  
Diamond Particle ◽  
Local Environment ◽  
Nitrogen Vacancy ◽  
Paramagnetic Resonance ◽  
Near Surface ◽  
Nv Center ◽  
Integrated Intensity ◽  
Diamond Powders ◽  
Nv Centers

A 100 nm synthetic diamond particle with a large (> 4 ppm) amount of nitrogen vacancy (NV) centers has been studied. The latter exhibit lines associated with forbidden Delta m_s = 2 and allowed Delta m_s = 1 transitions in the electron paramagnetic resonance (EPR) spectra of the ground state of the NV(-) center. The luminescence intensity of particles in the range 550-800 nm increases with an increase in the irradiation dose of 5 MeV electrons and correlates with the integrated intensity of the EPR line with a g-factor g = 4.27.This value is used to estimate the concentration of NV(-) centers and to select diamond powders with the highest fluorescence intensity. The dependence of the EPR signal intensity of the Delta m_s = 2 transition of the NV(-) center on the microwave power has the form of a curve with saturation and subsequent decay, and rather well characterizes the crystal quality of the local environment of the centers under study in these particles. The intensity of the x,y Delta m_s = 1 transition (at ~281.2 mT, 9.444 GHz) turns out to be more sensitive to changes in particle size in the submicron range and the appearance of near-surface defects obtained during mechanical processing.

scholarly journals Nitrogen-vacancy centers in diamond for nanoscale magnetic resonance imaging applications

2019 ◽  
Vol 10 ◽  
pp. 2128-2151 ◽  
Author(s):  
Alberto Boretti ◽  
Lorenzo Rosa ◽  
Jonathan Blackledge ◽  
Stefania Castelletto
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
High Resolution ◽  
Point Defect ◽  
Nitrogen Vacancy ◽  
Resonance Imaging ◽  
Magnetic Imaging ◽  
Nv Center ◽  
Nitrogen Vacancy Centers ◽  
Nv Centers

The nitrogen-vacancy (NV) center is a point defect in diamond with unique properties for use in ultra-sensitive, high-resolution magnetometry. One of the most interesting and challenging applications is nanoscale magnetic resonance imaging (nano-MRI). While many review papers have covered other NV centers in diamond applications, there is no survey targeting the specific development of nano-MRI devices based on NV centers in diamond. Several different nano-MRI methods based on NV centers have been proposed with the goal of improving the spatial and temporal resolution, but without any coordinated effort. After summarizing the main NV magnetic imaging methods, this review presents a survey of the latest advances in NV center nano-MRI.

scholarly journals Sensing Electrochemical Signals Using a Nitrogen-Vacancy Center in Diamond

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 358
Author(s):  
Hossein T. Dinani ◽  
Enrique Muñoz ◽  
Jeronimo R. Maze
Keyword(s):  
Electric Field ◽  
Electron Spin ◽  
Electrolyte Solution ◽  
High Sensitivity ◽  
Theoretical Work ◽  
Coherence Time ◽  
Nitrogen Vacancy ◽  
Local Concentration ◽  
Concentration Of Ions ◽  
Nv Center

Chemical sensors with high sensitivity that can be used under extreme conditions and can be miniaturized are of high interest in science and industry. The nitrogen-vacancy (NV) center in diamond is an ideal candidate as a nanosensor due to the long coherence time of its electron spin and its optical accessibility. In this theoretical work, we propose the use of an NV center to detect electrochemical signals emerging from an electrolyte solution, thus obtaining a concentration sensor. For this purpose, we propose the use of the inhomogeneous dephasing rate of the electron spin of the NV center (1/T2★) as a signal. We show that for a range of mean ionic concentrations in the bulk of the electrolyte solution, the electric field fluctuations produced by the diffusional fluctuations in the local concentration of ions result in dephasing rates that can be inferred from free induction decay measurements. Moreover, we show that for a range of concentrations, the electric field generated at the position of the NV center can be used to estimate the concentration of ions.

scholarly journals Investigation of evaporation of sessile droplets using luminescent nano-probes and other applications of NV centers in diamond

2018 ◽  
Vol 190 ◽  
pp. 02008
Author(s):  
Taras Plakhotnik ◽  
Haroon Aman
Keyword(s):  
Fluid Mechanics ◽  
Spatial Resolution ◽  
High Spatial Resolution ◽  
Solid Substrate ◽  
Model System ◽  
Nitrogen Vacancy ◽  
Dynamic Processes ◽  
Nitrogen Vacancy Centers ◽  
Nv Centers

The paper describes application of diamond nano crystals to research on dynamic processes in small (less than 1 mm across) evaporating droplets deposited on a solid substrate. Such droplets are used as a model system for testing proposed bio applications of nitrogen-vacancy centers in diamond. We demonstrate that a high spatial resolution of our methods reveals unexpected features of the evaporation and fluid mechanics in such droplets.

Optical detected magnetic resonance of nitrogen-vacancy centers in vertical diamond Schottky diode

2021 ◽  
Author(s):  
Muhammad Hafiz bin Abu Bakar ◽  
Aboulaye Traore ◽  
Junjie Guo ◽  
Toshiharu MAKINO ◽  
Masahiko Ogura ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Bias Voltage ◽  
Schottky Diode ◽  
Stark Effect ◽  
Reverse Bias ◽  
Nitrogen Vacancy ◽  
Reverse Bias Voltage ◽  
Zero Phonon Line ◽  
Optically Detected ◽  
Nv Centers

Abstract Diamond solid-state devices are very attractive to electrically control the charge state of Nitrogen-Vacancy (NV) centers. In this work, Vertical p-type Diamond Schottky Diode (VDSDs) is introduced as a platform to electrically control the interconversion between the neutral charge NV (NV0) and negatively charged NV (NV-) centers. The photoluminescence (PL) of NV centers generated by ion-implantation in VDSDs shows the increase of NV- Zero Phonon Line (ZPL) and phonon sideband (PBS) intensities with the reverse voltage, whereas the NV0 ZPL intensity decreases. Thus, NV centers embedded into VDSDs are converted into NV- under reverse bias voltage. Moreover, the optically detected magnetic resonance (ODMR) of NV- exhibits an increase in the ODMR contrast with the reverse bias voltage and splitting of the resonance dips. Since no magnetic is applied, such a dip splitting in ODMR spectrum is ascribed the Stark effect induced by the interaction of NV- with the electric field existing within the depletion region of VDSDs.

LASER INDUCED THERMAL LENS EFFECT IN RHODAMINE B — SIGNATURE OF RESONANT TWO PHOTON ABSORPTION

1995 ◽  
Vol 09 (22) ◽  
pp. 1471-1477 ◽  
Author(s):  
C. V. BINDHU ◽  
S. S. HARILAL ◽  
RIJU C. ISSAC ◽  
GEETHA K. VARIER ◽  
V. P. N. NAMPOORI ◽  
...  
Keyword(s):  
Rhodamine B ◽  
Laser Power ◽  
Photon Absorption ◽  
Thermal Lensing ◽  
Absorption Process ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Photon Process ◽  
Thermal Lens Effect ◽  
Made In

Measurement of thermal lensing signal as a function of laser power made in Rhodamine B solutions in methanol give clear evidence of two photon absorption process within certain concentration ranges when 488 nm Ar + laser beam is used as the pump source. Only one photon process is found to occur when 514 nm and 476 nm beams are used as the pump.

scholarly journals Brownian and advective dynamics in microflow studied by coherent X-ray scattering experiments

2016 ◽  
Vol 23 (6) ◽  
pp. 1401-1408 ◽  
Author(s):  
Raphael Urbani ◽  
Fabian Westermeier ◽  
Benjamin Banusch ◽  
Michael Sprung ◽  
Thomas Pfohl
Keyword(s):  
Correlation Functions ◽  
Brownian Dynamics ◽  
Flow Behavior ◽  
Colloidal Suspensions ◽  
Single Scattering ◽  
Correlation Spectroscopy ◽  
Two Dimensional ◽  
Advective Flow ◽  
X Ray ◽  
Auto Correlation

Combining microfluidics with coherent X-ray illumination offers the possibility to not only measure the structure but also the dynamics of flowing samples in a single-scattering experiment. Here, the power of this combination is demonstrated by studying the advective and Brownian dynamics of colloidal suspensions in microflow of different geometries. Using an experimental setup with a fast two-dimensional detector and performing X-ray correlation spectroscopy by calculating two-dimensional maps of the intensity auto-correlation functions, it was possible to evaluate the sample structure and furthermore to characterize the detailed flow behavior, including flow geometry, main flow directions, advective flow velocities and diffusive dynamics. By scanning a microfocused X-ray beam over a microfluidic device, the anisotropic auto-correlation functions of driven colloidal suspensions in straight, curved and constricted microchannels were mapped with the spatial resolution of the X-ray beam. This method has not only a huge potential for studying flow patterns in complex fluids but also to generally characterize anisotropic dynamics in materials.

scholarly journals High-resolution correlation spectroscopy of 13C spins near a nitrogen-vacancy centre in diamond

2013 ◽  
Vol 4 (1) ◽  
Author(s):  
Abdelghani Laraoui ◽  
Florian Dolde ◽  
Christian Burk ◽  
Friedemann Reinhard ◽  
Jörg Wrachtrup ◽  
...  
Keyword(s):  
High Resolution ◽  
Correlation Spectroscopy ◽  
Nitrogen Vacancy

Coumarin 6, Hypericin, Resorufins, and Flavins: Suitable Chromophores for Fluorescence Correlation Spectroscopy of Biological Molecules

2001 ◽  
Vol 66 (6) ◽  
pp. 855-869 ◽  
Author(s):  
Martin Beneš ◽  
Jiří Hudeček ◽  
Pavel Anzenbacher ◽  
Martin Hof
Keyword(s):  
Molecular Weight ◽  
Cytochrome P450 ◽  
Fluorescence Correlation Spectroscopy ◽  
Laser Power ◽  
Slow Component ◽  
Correlation Spectroscopy ◽  
Flavin Mononucleotide ◽  
Cytochrome P450 3A4 ◽  
Fluorescence Correlation ◽  
Coumarin 6

In this work we show that the dyes coumarin 6, hypericin, 7-O-ethylresorufin and resorufin are suitable for fluorescence correlation spectroscopy (FCS) and demonstrate the use of these dyes in physiologically relevant protein studies. Since coumarins are metabolised by cytochromes P450, the binding of coumarin 6 to cytochrome P450 3A4 was investigated by FCS. Coumarin 6 appears to be a very bright non-covalent cytochrome P450 label. When titrating cytochrome P450 3A4 with coumarin 6, the diffusion time of the coumarin 6/ cytochrome P450 3A4 complex increases roughly two-fold at protein concentrations higher than 1 μmol l-1, indicating the formation of cytochrome aggregates. FCS of the flavin mononucleotide (FMN) and flavin adenine dinucleotide (FAD) shows that both endogenous dyes undergo photobleaching. Moreover, FAD appears to be present to great extent, as a non-fluorescent intramolecular complex. Analysis of the FCS data of the flavoprotein NADPH-cytochrome P450 oxidoreductase (molecular weight 76 500) yielded two components. While the slow component corresponds to a globular protein with the molecular weight about 75 000, the fast component appears to be due to free diffusing FMN and FAD molecules. The amount of free FMN and FAD increases with increasing laser power. At high laser power a complete photodissociation of FMN and FAD occurs.

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