Design of NV Centers Integrated Magnetometer and High-Resolution Output Module Based on the ODMR System

In recent years, magnetic sensing based on the nitrogen-vacancy (NV) centers in diamonds has been considered to be a promising candidate for highly sensitive, spatial resolution solid-state quantum sensors. With the advancement of technology, scholars are committed to the introduction of miniaturized, highly integrated NV magnetometers. In this article, we integrate a focus system in the traditional laboratory into the sensor, propose a dual-focus magnetometer module (DFM), and design a signal-processing module (SPM) to perform current/voltage conversion–subtraction–amplification and filtering on the output signal of the DFM. Comparing the signal directly output by the DFM with the signal output after passing through the SPM the magnetic sensitivity and resolution are improved by 419 times and 256 times, respectively, and the magnetic resolution of the entire sensor reaches 24.6 nT in an area of 10.6 cm2. It has achieved a breakthrough in the resolution limit of integrated magnetometers in smaller volumes.