Skip to main content
. 2022 Jan 26;119(5):e2111607119. doi: 10.1073/pnas.2111607119

Fig. 1.

Fig. 1.

Surface NV-NMR spectroscopy on a functionalized metal oxide surface. (A) Scheme of the experiment. Near surface NV centers in a 2 × 2 × 0.5 mm diamond chip are excited with a 532-nm laser in a total internal reflection geometry. The resulting spin-dependent photoluminescence from the NV defects is detected with an avalanche photodiode. The microwave pulses for quantum control of the spin state of the defects are delivered through a small wire loop. (B) NV centers aligned with the magnetic field have sensing volumes with a radius determined by their distance to the surface, 4.5 ± 1.9 nm in our case. (Inset) Schematic of an organic monolayer formed from PFPDPA on 1 nm Al2O3 deposited on the diamond surface by ALD. (C) Correlation spectroscopy pulse sequence. Two blocks of dynamic decoupling XY8-N sequences are correlated by sweeping the time between them (tcorr). The time spacing τ between the π pulses is set to half the period of the Larmor frequency of the nuclear spin being sensed. The NV spin state is initialized with a 532-nm laser pulse, and photoluminescence detection with a photodiode occurs after the microwave pulse sequence.