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Phase sensitive quantum magnetometry imaging using emsemble NV center in diamond on wide field optics

皓介 水野, Kosuke Mizuno, 整 石綿, Hitoshi Ishiwata, 雄太 増山, Y. MASUYAMA, 孝之 岩崎, Takayuki Iwasaki, 睦子 波多野, Mutsuko Hatano

Published Jun 1, 2019• 0 citations
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Wide-field quantum magnetometry using nitrogen-vacancy (NV) center in diamond can be a breakthrough for a nuclear magnetic resonance (NMR) in a small volume, which is important for biological applications. Although the coherence time of the electron spin of the NV center results in a limited frequency resolution for diamond magnetometry in the range 10–100 kHz, recent studies have shown that a phase-sensitive protocol can circumvent this limit using a confocal setup. We proposed a new measurement protocol, “iQdyne,” which facilitates an improved frequency resolution of wide-field imaging, unencumbered by the coherence limit imposed by the NV center. We demonstrated wide-field magnetometry with a frequency resolution of 238 mHz and a magnetic sensitivity of 65 nT/Hz1/2, which are superior to those obtained using a conventional XY8-based technique, and showed the potential of the iQdyne protocol for the wide-field NMR imaging.
Abstract In order to enhance the spin-dependent fluorescence signal coupled with outer fields, accurate positioning of the center of nitrogen-vacancy (NV) in bulk diamond is important in enhancing the sensitivity of the solid-state quantum magnetometry. In this paper, we have developed a new approach of three-dimensional optical scanning techniques for the imaging of variable-density of high concentration of NV centers in the interior of the diamond at the micrometer scale. The research defined the definite trajectories of electrons with different energies to generate NV – centers in diamond based on Monte-Carlo simulation results. Moreover, it also confirmed experimentally that the accurate location for the center of NV – in the diamond is at the depth of 100 μ m, using three-dimensional optical vertical scanning techniques. This research paves the way to produce various depth-confined NV centers, with high coherence, important in wide-field magnetometry applications.