Nitrogen-vacancy color centers in diamond are a very promising medium for many\nsensing applications such as magnetometry and thermometry. In this work, we study nanodiamonds\ndeposited from a suspension onto glass substrates. Fluorescence and optically detected magnetic\nresonance spectra recorded with the dried-out nanodiamond ensembles are presented and a suitable\nscheme for tracking the magnetic-field value using a continuous poly-crystalline spectrum is\nintroduced. Lastly, we demonstrate a remote-sensing capability of the high-numerical-aperture\nimaging fiber bundle with nanodiamonds deposited on its end facet.
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