Miniature cavity-enhanced diamond magnetometer

Abstract

We present a highly sensitive miniaturized cavity-enhanced room-temperature magnetic-field sensor based on nitrogen-vacancy (NV) centers in diamond. The magnetic resonance signal is detected by probing absorption on the 1042\,nm spin-singlet transition. To improve the absorptive signal the diamond is placed in an optical resonator. The device has a magnetic-field sensitivity of 28 pT/$\sqrt{\mathrm{Hz}}$, a projected photon shot-noise-limited sensitivity of 22 pT/$\sqrt{\mathrm{Hz}}$ and an estimated quantum projection-noise-limited sensitivity of 0.43 pT/$\sqrt{\mathrm{Hz}}$ with the sensing volume of $\sim$ 390 $\mu$m $\times$ 4500 $\mu$m${}^2$. The presented miniaturized device is the basis for an endoscopic magnetic field sensor for biomedical applications.

References in corpus (4)

• Strongly enhanced photon collection from diamond defect centres under micro-fabricated integrated solid immersion lenses
• Optical properties of the nitrogen-vacancy singlet levels in diamond
• Broadband magnetometry by infrared-absorption detection of nitrogen-vacancy ensembles in diamond
• Integrated Diamond Optics for Single Photon Detection

Cited by in corpus (1)

• Nitrogen-Vacancy Ensemble Magnetometry Based on Pump Absorption