Figure 2 | Scientific Reports

Figure 2

From: Magnetometer with nitrogen-vacancy center in a bulk diamond for detecting magnetic nanoparticles in biomedical applications

Figure 2

(a) Schematic of driving and lock-in detection system of a magnetometer with diamond NV− center: MW for generating ESR, green laser for excitation of electron energy state of NV− center, photodetector for measuring red fluorescence, and electric current for generating AC magnetic fields. Excitation and luminescence light enters and returns through a bifurcated optical fiber bundle, respectively. The external magnetic fields of a permanent magnet produce dip splitting of each NV axis. (b) Image of the developed diamond NV magnetometer (prototype). The green laser excites red fluorescence in the diamond NV. The longitudinal and lateral directions are the Z-axis and R-axis, respectively.

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