Four-channel optically pumped atomic magnetometer for magnetoencephalography

Custom DOE used
Published on:
Authors: Colombo, Anthony P.; Carter, Tony R.; Borna, Amir; Jau, Yuan-Yu; Johnson, Cort N.; Dagel, Amber L. & Schwindt, Peter D. D.
Abstract:

“We have developed a four-channel optically pumped atomic magnetometer for magnetoencephalography (MEG) that incorporates a passive diffractive optical element (DOE). The DOE allows us to achieve a long, 18-mm gradiometer baseline in a compact footprint on the head. Using gradiometry, the sensitivities of the channels are < 5 fT/Hz<sup>1/2</sup>, and the 3-dB bandwidths are approximately 90 Hz, which are both sufficient to perform MEG. Additionally, the channels are highly uniform, which offers the possibility of employing standard MEG post-processing techniques. This module will serve as a building block of an array for magnetic source localization.”

Open Access

Publication: Optics Express
Issue/Year: Opt. Express, Volume 24; Number 14; Pages 15403–15416; 2016
DOI: 10.1364/OE.24.015403
Link: https://doi.org/10.1364/OE.24.015403

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