Simultaneous Wide-field Imaging of Phase and Magnitude of AC Magnetic Signal Using Diamond Quantum Magnetometry

Abstract

Spectroscopic analysis of AC magnetic signal using diamond quantum magnetometry is a promising technique for inductive imaging. Conventional dynamic decoupling like XY8 provides a high sensitivity of an oscillating magnetic signal with intricate dependence on magnitude and phase, complicating high throughput detection of each parameter. In this study, a simple measurement scheme for independent and simultaneous detection of magnitude and phase is demonstrated by a sequential measurement protocol. Wide-field imaging experiment was performed for an oscillating magnetic field with approximately 100$\mu$m-squared observation area. Single pixel phase precision was $2.1^{\circ }$ for 0.76$\mu$T AC magnetic signal. Our method enables potential applications including inductive inspection and impedance imaging.

9 pages, 4 figures

References in corpus (3)

• Sub-millihertz magnetic spectroscopy with a nanoscale quantum sensor
• Quantum sensing with arbitrary frequency resolution
• Single-spin magnetometry with multi-pulse sensing sequences

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