Diamond-on-chip infrared absorption magnetic field camera

TL;DR

This paper introduces a novel integrated diamond-based infrared absorption magnetic field camera capable of spatially resolving magnetic fields with potential applications in medical diagnostics and neural research.

Contribution

The work presents a new integrated magnetic field sensing device using IRA-ODMR with a pixel matrix, enabling robust, fiber-packaged, and adjustment-free magnetic imaging.

Findings

Demonstrated 3x3 pixel sensor reconstructs electromagnet position

Identified methods to improve sensitivity and spatial resolution

Potential for integration into portable, robust sensing devices

Abstract

Integrated and fiber-packaged magnetic field sensors with a sensitivity sufficient to sense electric pulses propagating along nerves in life science applications and with a spatial resolution fine enough to resolve their propagation directions will trigger a tremendous step ahead not only in medical diagnostics, but in understanding neural processes. Nitrogen-vacancy centers in diamond represent the leading platform for such sensing tasks under ambient conditions. Current research on uniting a good sensitivity and a high spatial resolution is facilitated by scanning or imaging techniques. However, these techniques employ moving parts or bulky microscope setups. Despite being far developed, both approaches cannot be integrated and fiber-packaged to build a robust, adjustment-free hand-held device. In this work, we introduce novel concepts for spatially resolved magnetic field sensing and 2-D gradiometry with an integrated magnetic field camera. The camera is based on infrared absorption optically detected magnetic resonance (IRA-ODMR) mediated by perpendicularly intersecting infrared and pump laser beams forming a pixel matrix. We demonstrate our 3-by-3 pixel sensor's capability to reconstruct the position of an electromagnet in space. Furthermore, we identify routes to enhance the magnetic field camera's sensitivity and spatial resolution as required for complex sensing applications.