Nanoscale amplitude and phase sensing of a rf electromagnetic field can benefit broad frontiers in sci-ence and technology. The imaging applications in these research areas demand a nanoscale sensor able to detect rf electric fields over a wide frequency range under ambient conditions, which remains a challenge. Here, we present a rf electrometry based on the forbidden magnetic dipole transition of a single shallow nitrogen-vacancy center in diamond and experimentally demonstrate the detection of rf electric fields at frequencies ranging from 13.85 MHz to 2.02 GHz. A sensitivity of 265 V cm-1 Hz-1/2 for amplitude mea-surement and a standard deviation of 0.2 degrees for phase measurement are achieved. The potential applications of nanoscale sensing and imaging of electromagnetic field are discussed.
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