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

MetadataDetails
Publication Date2022-04-11
JournalCarbon
AuthorsAdam Filipkowski, Mariusz Mrózek, Grzegorz Stępniewski, Jakub Kierdaszuk, Aneta Drabińska
InstitutionsUniversity of Warsaw, Łukasiewicz Research Network
Citations24

Integration of optically active diamond particles with glass fibers is a powerful method of scaling diamond’s magnetic sensing functionality. We propose a novel approach for the integration of diamond particles containing nitrogen-vacancy centers directly into the fiber core. The core is fabricated by stacking the preform from 790 soft glass canes, drawn from a single rod dip-coated with submicron diamond particles suspended in isopropyl alcohol. This enables manual control over the distribution of nanoscale features, here - the diamond particles across the optical fiber core. We verify this by mapping the diamond distribution in the core using confocal microscopy. The particles are separated longitudinally by 12-29 μm, while in the transverse plane a separation of approximately 1.5-2.2 μm is observed, corresponding to the individual cane diameter in the final fiber, and without significant agglomeration. The fiber’s magnetic sensitivity is confirmed in optically detected magnetic resonance recorded with a coiled, 60-cm-long fiber sample with readout contrast of 1.3% limited by microwave antenna coverage. Moreover, magnetic-field dependence of the NV─ fluorescence intensity is demonstrated in the absence of microwaves, allowing magnetometric applications with a large (from 0 to 35 mT) B-field dynamic range.

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