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Integration of optically-active nanodiamonds with glass fibers is a powerfulmethod of scaling of diamond magnetic sensing functionality. We propose a novelapproach for integration of nanodiamonds containing nitrogen-vacancy centersdirectly into the fiber core. The core is fabricated using nanostructurization,that is by stacking the preform from 790 soft glass canes, drawn from a singlerod dip-coated with nanodiamonds suspended in isopropyl alcohol. This enablesmanual control over distribution of nanoscale features, here - the nanodiamondsacross and along the fiber core. We verify this by mapping the nanodiamonddistribution in the core using confocal microscopy. The nanodiamonds areseparated longitudinally either by 15 microns or 24 microns, while in thetransverse plane separation of approximately 1 micron is observed,corresponding to the individual cane diameter in the final fiber, withoutsignificant agglomeration. Filtered, red fluorescence is observed with nakedeye uniformly along the fiber. Its magnetic sensitivity is confirmed by inoptically detected magnetic resonance recorded with a coiled, 60-cm-long fibersample with readout contrast limited mainly by microwave antenna coverage. NVfluorescence intensity in 0 to 35 mT magnetic field is also demonstrated,allowing magnetometry applications with a large B-field dynamic range inabsence of microwaves.

Volumetric incorporation of NV diamond emitters in nanostructured F2 glass magneto-optical fiber probes