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Publication Citation: Chip-scale atomic magnetometer

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Author(s): P Schwindt; Svenja A. Knappe; V Shah; Leo W. Hollberg; John E. Kitching; Li-Anne Liew; John Moreland;
Title: Chip-scale atomic magnetometer
Published: December 27, 2004
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: 85
Issue: 26
Pages: pp. 6409 - 6411
Keywords: atomic sensors;coherent population trapping;magnetometry;MEMS
Research Areas:
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