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arXiv · 2406.15450

Quantum Diamond Microscope for Narrowband Magnetic Imaging with High Spatial and Spectral Resolution

Zechuan Yin·Jiashen Tang·Connor A. Hart·John W. Blanchard·Xinyan Xiang·Saipriya Satyajit·Smriti Bhalerao·Tao Tao·Stephen J. DeVience·Ronald L. Walsworth
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Abstract

The quantum diamond microscope (QDM) is a recently developed technology for near-field imaging of magnetic fields with micron-scale spatial resolution. In the present work, we integrate a QDM with a narrowband measurement protocol and a lock-in camera; and demonstrate imaging of radiofrequency (RF) magnetic field patterns produced by microcoils, with spectral resolution $\approx1$\,Hz. This RF-QDM provides multi-frequency imaging with a central detection frequency that is easily tunable over the MHz-scale, allowing spatial discrimination of both crowded spectral peaks and spectrally well-separated signals. The present instrument has spatial resolution $\approx2\,\mathrm{μm}$, field-of-view $\approx300\times300\,\mathrm{μm^2}$, and per-pixel sensitivity to narrowband fields $\sim{1}\,$nT$\cdot$Hz$^{-1/2}$. Spatial noise can be reduced to the picotesla scale by signal averaging and/or spatial binning. The RF-QDM enables simultaneous imaging of the amplitude, frequency, and phase of narrowband magnetic field patterns at the micron-scale, with potential applications in real-space NMR imaging, AC susceptibility mapping, impedance tomography, analysis of electronic circuits, and spatial eddy-current-based inspection.

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Zechuan Yin, Jiashen Tang, Connor A. Hart, John W. Blanchard, Xinyan Xiang, Saipriya Satyajit, Smriti Bhalerao, Tao Tao, Stephen J. DeVience, Ronald L. Walsworth. 2024-10-16. Quantum Diamond Microscope for Narrowband Magnetic Imaging with High Spatial and Spectral Resolution. https://arxiv.org/abs/2406.15450

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