Figure 2: Experiment results of the MW magnetic field amplitude measurement.
From: High-resolution vector microwave magnetometry based on solid-state spins in diamond
(a) Electron spin resonance lines of the NV centres. (b) Pulse sequence of vector MW magnetometry. The 5-μs laser pulse and 2-μs waiting time initialize the NV centre to |0›. Then the MW is on and the NV centre sense the MW magnetic field. Finally, the laser is on and the amount of photons is counted to determine the spin state. (c) Rabi oscillations. Each point of the data is repeated for 1.5 × 105 times to increase the signal to noise ratio. The fitting yields Bmwp=(2.106±0.002) × 10−4 T and a sensitivity of 1.0 μT Hz−1/2. (d) Fourier transformation of Rabi oscillations in c, with a red line connecting the data. The frequencies of the peak (*) and the other one are 4.17 MHz and 4.68 MHz. (e) Measured projected MW magnetic field versus MW source power.
