Integrated and portable magnetometer based on nitrogen-vacancy ensembles in diamond

TL;DR

This paper presents a portable, integrated nitrogen-vacancy diamond magnetometer that combines all components into a compact device, achieving high sensitivity suitable for practical applications.

Contribution

The authors develop a fully integrated, fiber-based NV magnetometer that eliminates bulky lab equipment, enabling portable magnetic field measurements at room temperature.

Findings

Achieved a sensitivity of 344 pT/√Hz.

Demonstrated complete integration of functional components.

Enabled portable magnetic field sensing without laboratory equipment.

Abstract

Magnetic field sensors that exploit quantum effects have shown that they can outperform classical sensors in terms of sensitivity enabling a range of novel applications in future, such as a brain machine interface. Negatively charged nitrogen-vacancy (NV) centers in diamond have emerged as a promising high sensitivity platform for measuring magnetic fields at room temperature. Transferring this technology from laboratory setups into products and applications, the total size of the sensor, the overall power consumption, and the costs need to be reduced and optimized. Here, we demonstrate a fiber-based NV magnetometer featuring a complete integration of all functional components without using any bulky laboratory equipment. This integrated prototype allows portable measurement of magnetic fields with a sensitivity of 344 pT/ SqrtHz.