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Researchers have extended the operational bandwidth of diamond-based nitrogen-vacancy sensors to approximately 100MHz using microwave-driven dressed states, overcoming previous limitations of conventional continuous-wave optically detected magnetic resonance. This advancement enables high-frequency magnetic field measurements essential for applications in advanced biological imaging and materials characterization. The technique validates a scalable pathway for integrating quantum sensors into systems requiring rapid, high-bandwidth magnetic data acquisition.

Source coveringQuantum Zeitgeist

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Diamond Sensors Now Detect a Far Wider Range of Magnetic Frequencies

Quantum ZeitgeistJune 10, 20265 min read

Detecting alternating current magnetic fields beyond a few MHz has long presented a challenge for conventional quantum sensors. Now, a new scheme utilising nitrogen-vacancy centres in diamond extends this detectable range to approximately 100MHz. This broadened bandwidth, achieved through microwave-driven dressed states and continuous-wave optically detected magnetic resonance, promises advances in medical imaging and materials science.

A new approach to detecting alternating current (AC) magnetic fields has been achieved by Ryohei Dokai of Chuo University and colleagues. The team’s continuous-wave optically detected magnetic resonance (CW-ODMR) scheme, utilising nitrogen-vacancy (NV) centres in diamond, overcomes bandwidth limitations previously found in this type of sensor. Theoretical analysis and simulations reveal the potential to detect AC magnetic fields at frequencies up to 100MHz, sharply exceeding the capabilities of conventional CW-ODMR methods and enabling broader applications in high-frequency magnetic field measurement. Detecting alternating current (AC) magnetic fields up to 100MHz represents a substantial leap forward, exceeding the…

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