Investigation of nv centres in aggregates of detonation nanodiamonds



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Investigation of NV centres in aggregates of detonation nanodiamonds

Anton Zeleneev1,3,*, Stepan Bolshedvorskii2,3,4, Vadim Vorobyov2,4, Vladimir Soshenko2,4, Vadim Sorokin1,2, Alexey Akimov1,2,5
1Russian Quantum Center, Moscow, 143025, Russia

2P.N. Lebedev Physical Institute of the Russian Academy of Science, Moscow, Russia

3Moscow Institute of Physics and Technology, Dolgoprudny, Russia

4Spin Sensor Technology, Moscow, Russia

5Texas A&M University, College Station, USA

Abstract. Here, we experimentally investigate optical and spin properties of NV centers in aggregates of detonation nanodiamonds. It was found out that despite the small size of nanodiamonds forming the aggregate, the NV centers in these aggregates have spin properties comparable to similar size nanodiamonds but with brightness enhanced by a factor of 2.



Currently, the color centers in the diamond have a huge community attention. So, NV (Nitrogen-Vacancy) color centers are actively being studied as a principal element of quantum information processing [1], and also have some applications as sensors for magnetic and electric fields, temperature [2,3]. Nowadays one direction of research is the searching optically active color centers and the study of their optical properties in nanodiamonds [4]. Interest in nanodiamonds is determined mostly by sensory applications, in which nanodiamond can play the role of a sensitive element of the detector. In addition, nanodiamonds can serve as natural single-photon sources, the radiation of which can be collected and intensified [5].

Fig. 1. a) TEM image of DND aggregation; b) g2 autocorrelation function.
In this research, we experimentally investigate optical and spin properties of NV centers in aggregates of detonation nanodiamonds (DND). Aggregate of DND is compound of diamond nanoparticles with size of 2-5 nm (see Fig. 1a), which forming an aggregate with size up to 100 nm. Because of a small probability of forming NV centers in DND (lower 1 % [6]) aggregate of DND often contains single NV center (see Fig. 1b). This fact allows us effectively investigate optical and spin properties of single spin in such an aggregate.

Optical properties of NV centers in DND are interesting. These are very bright centers, the number of emitted photons is 2.2 times greater with respect to 50 nm nanodiamonds using our confocal setup. Sensory applications, however, like applications for processing quantum information, are also extremely sensitive to the spin properties of NV centers. Therefore, we made a detailed study of the spin properties of the electronic system of NV centers in DND. In the presence of external magnetic field (see Fig. 2a) we performed a coherent manipulation of the electron spin by a microwave field (see Fig. 2b), the damping of Rabi oscillations allowed us to estimate the coherence time  for the electron spin. Applying of Hahn echo sequence allow us to measure the coherence time =3-5 μs for the electron spin, which similar to nanodimonds with bigger size [7].



Fig. 2. a) Electron spin resonance of NV center obtained in continuous wave laser regime; b) Rabi oscillations of electron spin of NV center.
Thus, bright and easily obtained aggregates may become successful replacement of bigger nanodiamonds for sensing applications kite magnetometry and thermometry, in particular in biology, due to its nontoxicity of diamond. In addition, reasonable results of the spin properties of aggregates of DND indicate potentially good spin properties in the detonation nanodiamonds themselves, which opens the possibility of using DND in nanophotonic applications.
REFERENCES:

  1. M. W. Doherty, N. B. Manson, P. Delaney , F. Jelezko, et. al., Nat. Phys. 7, 459–463 (2011)

  2. J. R. Maze, P. L. Stanwix, J. S. Hodges, S. Hong , M. Lukin, et. al., Nature. 455, 644–647 (2008)

  3. I. Vlasov, et. al., Nature nanotechnology. 9, 54-58 (2013)

  4. M. Shalaginov, et. al., Laser & Photonics Reviews. 9, 120–127 (2014)

  5. C. Bradac, et. al., Nature nanotechnology. 5, 345–349 (2010)

  6. J. R. Rabeau, et. al., Nano Lett. 7, 3433–3437 (2007)

  7. R. Schirhagl, K., M. Loretz, C. L. Degen, Annu. Rev. Phys. Chem. 65, 83–105 (2014)

* zeleneev.ai@phystech.edu

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