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. 2019 Nov 4;10:2128–2151. doi: 10.3762/bjnano.10.207

Figure 6.

Figure 6

NV-ensemble sensor for coherently averaged synchronized readout (CASR) NMR. Image reprinted with permission from [82], copyright 2018, Springer Nature Publishing. (a) NV-ensemble sensor based on an NV center surface layer on a diamond chip, probed by a green laser. Thermally polarized nuclear spins are NMR detected from the sample. (b) CASR detection of an NMR FNP signal. Top row: thermally polarized spin precession at frequency f causes oscillations in the magnetic field. Middle row: CASR protocol made of optical NV spin-state readouts blocks repeated at the synchronized readout cycle period intertwined with blocks of identical NV AC magnetometry pulse sequences with central frequency. (c) Probe geometry: a cuvette holds the sample and the diamond chip, above and below are the cylindrical coils driving the nuclear spins, while a wire antenna drives the NV centers. A light guide collects the spin-state-dependent fluorescence from the NV to bring it to a photodiode, while an electromagnet supplies the magnetic bias field.