Chip-scale atomic magnetometer

P  Schwindt; Svenja A. Knappe; V  Shah; Leo W. Hollberg; John E. Kitching; Li-Anne  Liew; John  Moreland

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Chip-scale atomic magnetometer

Published

December 27, 2004

Author(s)

P Schwindt, Svenja A. Knappe, V Shah, Leo W. Hollberg, John E. Kitching, Li-Anne Liew, John Moreland

Abstract

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.

Citation

Applied Physics Letters

Volume

Issue

Pub Type

Journals

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Keywords

atomic sensors, coherent population trapping, magnetometry, MEMS

Created December 27, 2004, Updated January 27, 2020