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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|
|Pages:||pp. 6409 - 6411|
|Keywords:||atomic sensors,coherent population trapping,magnetometry,MEMS|
|PDF version:||Click here to retrieve PDF version of paper (175KB)|