Article Dans Une Revue Optics Express Année : 2021

Helium-4 magnetometers for room-temperature biomedical imaging: toward collective operation and photon-noise limited sensitivity

Résumé

Optically-pumped magnetometers constitute a valuable tool for imaging biological magnetic signals without cryogenic cooling. Nowadays, numerous developments are being pursued using alkali-based magnetometers, which have demonstrated excellent sensitivities in the spin-exchange relaxation free (SERF) regime that requires heating to >100 °C. In contrast, metastable helium-4 based magnetometers work at any temperature, which allows a direct contact with the scalp, yielding larger signals and a better patient comfort. However former 4 He magnetometers displayed large noises of > 200 fT/Hz$^{1/2}$ with 300-Hz bandwidth. We describe here an improved magnetometer reaching a sensitivity better than 50 fT/Hz$^{1/2}$ , nearly the photon shot noise limit, with a bandwidth of 2 kHz. Like other zero-field atomic magnetometers, these magnetometers can be operated in closed-loop architecture reaching several hundredths nT of dynamic range. A small array of 4 magnetometers operating in a closed loop has been tested with a successful correction of the cross-talks.
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cea-04907760 , version 1 (23-01-2025)

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William Fourcault, Rudy Romain, Gwenael Le Gal, François Bertrand, Vincent Josselin, et al.. Helium-4 magnetometers for room-temperature biomedical imaging: toward collective operation and photon-noise limited sensitivity. Optics Express, 2021, 29 (10), pp.14467. ⟨10.1364/oe.420031⟩. ⟨cea-04907760⟩
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