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Abstract
The ultraviolet-visible (UV-Vis) spectrum was not generally considered an available method for measuring the concentration of negatively charged nitrogen-vacancy (NV-, NV center). In this study, we propose the idea of evaluating the concentration of NV center by the slope of the UV-Vis spectrum. To establish this new method we synthesized diamonds with different NV center concentrations by the chemical vapor deposition (CVD) method. We then measured the zero-phonon line (ZPL) intensity of PL spectra at 637 nm and estimated the concentration of the NV centers as a baseline for comparison to our new UV-Vis method. The UV-Vis transmission spectra were then measured and transformed to relative absorption coefficient spectra. Slopes of the transformed UV-Vis spectra between 400 nm and 800 nm were calculated and compared with the ZPL intensities. The results show a strong positive correlation between the slopes of the absorption spectra and the ZPL intensities of PL spectra at 637 nm. Therefore, this paper demonstrates the feasibility of estimating the concentration of the NV centers from measuring the transmission UV-Vis spectrum.
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Details
1 School of Mechanical Science & Engineering, Huazhong University of Science & Technology , Wuhan , People’s Republic of China
2 School of Mechanical Engineering & Automation, Wuhan Textile University , Wuhan , People’s Republic of China
3 School of Power and Mechanical Engineering, Wuhan University , Wuhan , People’s Republic of China
4 CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China , Hefei 230026 , People’s Republic of China