Figure 1

Experimental arrangement for diamond-based wide-field magnetic imaging.

(a) Schematic diagram of the instrument, illustrating the inverted microscope with green laser excitation and an sCMOS camera to image the fluorescence from a two-dimensional array of NV centres implanted in diamond. The exploded assembly at right illustrates the diamond imaging chip mounted on a glass coverslip equipped with a microwave (MW) resonator. The magnetic sample is placed face down onto the diamond. (b) Raw fluorescence image from the NV array. (c) ODMR spectra of the NV array integrated over the entire field of view with (upper) and without (lower) applied magnetic field. The applied field (13.4 mT) was aligned along one particular NV axis with the other three NV axes experiencing the same magnetic field projection. This results in a pair of ODMR lines for the aligned NV centres (NV_aligned) and a second set of ODMR lines for the misaligned NV centres.