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Owing to the unique electronic spin properties, the nitrogen-vacancy (NV)centers hosted in diamond have emerged as a powerful quantum sensor for variousphysical parameters and biological species. In this work, a miniatureoptical-fiber quantum probe, configured by chemically-modifying nanodiamonds NVcenters on the surface of a cone fiber tip, is developed. Based oncontinue-wave optically detected magnetic resonance method and lock-inamplifying technique, it is found that the sensing performance of the probe canbe engineered by varying the nanodiamonds dispersion concentration andmodification duration in the chemical modification process. Combined with apair of magnetic flux concentrators, the magnetic field detection sensitivityof the probe is significantly enhanced to 0.57 nT/Hz1/2 @ 1Hz, a new recordamong the fiber magnetometers based on nanodiamonds NV. Taking Gd3+ as thedemo, the capability of the probe in paramagnetic species detection is alsodemonstrated experimentally. Our work provides a new approach to develop NVcenter as quantum probe featuring high integration, miniature size,multifunction, and high sensitivity, etc.

Nanodiamonds based optical-fiber quantum probe for magnetic field and biological sensing