Towards endoscopic magnetic field sensors for biomedical applications

We propose and report on the progress towards a miniaturized endoscopic magnetic field sensor based on color center ensembles in diamond. The unique design of the sensor enables spatially resolved in-vivo measurements of static and oscillating magnetic fields with a broad bandwidth and high sensitivity. An endoscopic magnetometer could boost the size of magnetic signals of the heart, the brain or other organs due to the reduced distance to the underlying current densities. The high-bandwidth of the device enables spatially resolved methods for tissue discrimination such as nuclear magnetic resonance or eddy-current detection in vivo.