P Schwindt, Svenja A. Knappe, V Shah, Leo W. Hollberg, John Kitching, Li-Anne Liew, John Moreland
Using the techniques of micro-electro-mechanical systems (MEMS), we have constructed a small, low-power magnetic sensor based on alkali atoms. By measuring the energy shift of the atoms' magnetic moment due to a magnetic field via a coherent population trapping resonance, we detect the magnetic flux density with a sensitivity of 50 pT Hz-1/2 at 10 Hz. The magnetic sensor has a size of 12 mm3 and dissipates 195 mW of power. Further improvements in size, power dissipation, and magnetic field sensitivity are immediately foreseeable, and such a device could provide a hand-held, battery-operated magnetometer with an atom shot-noise limited sensitivity of 0.05 pT Hz-1/2.
atomic sensors, coherent population trapping, magnetometry, MEMS
, Knappe, S.
, Shah, V.
, Hollberg, L.
, Kitching, J.
, Liew, L.
and Moreland, J.
Chip-scale atomic magnetometer, Applied Physics Letters, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=50058
(Accessed January 26, 2023)