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Fig. 2 | Nanoscale Research Letters

Fig. 2

From: Divergent Effects of Laser Irradiation on Ensembles of Nitrogen-Vacancy Centers in Bulk and Nanodiamonds: Implications for Biosensing

Fig. 2

Fluorescence and ODMR spectra. Fluorescence and ODMR spectra for the a,d bulk diamond, b,e 156 nm and c,f 59 nm NDs, respectively. a,b,c NV0 and NV fluorescence spectra are characterized by ZPL lines at 575 nm (NV0) and 638 nm (NV). Due to surface effects, NDs have a larger NV0 component than bulk diamond, where the NV0 band is practically undetectable. Panels d,e,f show ODMR spectra at different laser power with fixed MW power. In the ODMR spectra, the NV central lines (AL and AR) provide a measure of the spin polarization of \(\left|\mathrm{g},{\mathrm{m}}_{\mathrm{s}}=0\right.\rangle\) ground state. The MW range was set to 2.75–3 GHz to show the NV central lines and the 13C-coupled sidebands (BL and BR). In bulk diamond, ODMR contrast increases with increasing laser power. Conversely, in the NDs, the ODMR contrast increases up to 8.1 mW and then, decreases at higher laser powers. Both FL spectra and ODMR spectra were acquired under continuous laser irradiation. The small peak at ~ 800 nm in the FL spectra is an artifact of the Raman spectrometer

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