Weak Magnetic Field Effects on the Photoluminescence of an Ensemble of NV Centers in Diamond: Experiment and Modelling
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XVIII INTERNATIONAL SYMPOSIUM “NANOSTRUCTURES: PHYSICS AND TECHNOLOGY”, MINSK, REPUBLIC OF BELARUS, SEPTEMBER, 2020. SPIN RELATED PHENOMENA IN NANOSTRUCTURES
Weak Magnetic Field Effects on the Photoluminescence of an Ensemble of NV Centers in Diamond: Experiment and Modelling D. S. Filimonenkoa,*, V. M. Yasinskiia,**, A. P. Nizovtseva,***, S. Ya. Kilina,****, and F. Jelezkob,***** a B.I.
Stepanov Institute of Physics, National Academy of Sciences of Belarus, Minsk, Belarus b Institute for Quantum Optics, Ulm University, Ulm, Germany *e-mail: [email protected] **e-mail: [email protected] ***e-mail: [email protected] ****e-mail: [email protected] *****e-mail: [email protected] Received June 23, 2020; revised July 23, 2020; accepted July 27, 2020
Abstract—The relationship between the photoluminescence intensity of the ensemble of NV centers in diamond and external magnetic field was studied. The magnetic spectra exhibit two resonances. The broader one has a width of 20 G and its amplitude is independent of the polarization of the incident radiation. The narrow resonance with a width of 4 G is found to be polarization dependent and is only visible if the direction of magnetic field is more or less perpendicular to the laser light polarization. To describe the appearance of these resonances we have modified the 8-level model of the NV center by taking into account the cross-relaxation between the ground-state spin of the center and other surrounding electronic spins (those of differently aligned NV centers, substitutional N spins etc.). Keywords: electronic spin resonance, optically detected magnetic resonance, NV center, magnetometry DOI: 10.1134/S1063782620120076
1. INTRODUCTION NV centers in diamond have attracted enormous attention in connection with the prospects of their use in various fields of science and technology. One of the promising applications is the use of NV centers for magnetometry. Among numerous papers [1] on this subject there are only a few which focus on the behavior of the NV centers fluorescence in the presence of a weak magnetic field [2, 3]. Here we are presenting the experimental and theoretical results which relate to this issue. 2. EXPERIMENTAL The schematic of the experimental setup used in this study is similar to the one in our previous work [3]. The experiments were performed using 1 mm diamonds produced by HPHT method. NV centers were created by high-energy particles irradiation and subsequent thermal annealing. A continuous-wave linearly
polarized Nd:YAG laser operating at a 532 nm wavelength was used to excite fluorescence. The radiation power was 30 mW. The radiation was focused on a spot of 0.3 mm diameter. A quarter-wave plate converts linearly polarized light into circularly polarized, and the direction of polarization was controlled using linear polarizers. This way, we were also able to investigate the effect of the laser light polarization on the fluorescence of NV centers in weak magnetic field. To measure the magnetic field dependence on the fluorescen
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