An optically pumped magnetic gradiometer for the detection of human biomagnetism

Harry Cook; Yulia Bezsudnova; Lari M Koponen; Ole Jensen; Giovanni Barontini; Anna U Kowalczyk

doi:10.1088/2058-9565/ad3d81

An optically pumped magnetic gradiometer for the detection of human biomagnetism

Harry Cook, Yulia Bezsudnova, Lari M Koponen, Ole Jensen, Giovanni Barontini, Anna U Kowalczyk^*

^*Corresponding author for this work

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Abstract

We realise an intrinsic optically pumped magnetic gradiometer based on non-linear magneto-optical rotation. We show that our sensor can reach a gradiometric sensitivity of 18 fT cm⁻¹√Hz⁻¹ and can reject common mode homogeneous magnetic field noise with up to 30 dB attenuation. We demonstrate that our magnetic field gradiometer is sufficiently sensitive and resilient to be employed in biomagnetic applications. In particular, we are able to record the auditory evoked response of the human brain, and to perform real-time magnetocardiography in the presence of external magnetic field disturbances. Our gradiometer provides complementary capabilities in human biomagnetic sensing to optically pumped magnetometers, and opens new avenues in the detection of human biomagnetism.

Original language	English
Article number	035016
Number of pages	10
Journal	IOP Quantum Science and Technology
Volume	9
Issue number	3
Early online date	26 Apr 2024
DOIs	https://doi.org/10.1088/2058-9565/ad3d81
Publication status	E-pub ahead of print - 26 Apr 2024

Keywords

magnetoencephalography
nonlinear magneto-optical rotation
optically pumped magnetic gradiometer
auditory evoked response
optically pumped magnetometer

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10.1088/2058-9565/ad3d81Licence: Creative Commons: Attribution (CC BY)

CookH2024opticallyFinal published version, 1.15 MBLicence: Creative Commons: Attribution (CC BY)

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Kowalczyk, A., Park, H., Frisson, S., Jensen, O. & An, K.
THE WELLCOME TRUST
1/11/23 → 30/09/31
Project: Research
Hybridised quantum sensors for enhanced magnetoencephalography
Kowalczyk, A.
Engineering & Physical Science Research Council
1/10/22 → 30/09/26
Project: Research Councils
STIMUSURE - Simultaneous magnetic brain stimulation and measurement
Jensen, O. & Koponen, L.
European Commission
18/08/21 → 15/02/24
Project: EU

Cite this

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title = "An optically pumped magnetic gradiometer for the detection of human biomagnetism",

abstract = "We realise an intrinsic optically pumped magnetic gradiometer based on non-linear magneto-optical rotation. We show that our sensor can reach a gradiometric sensitivity of 18 fT cm−1√Hz−1 and can reject common mode homogeneous magnetic field noise with up to 30 dB attenuation. We demonstrate that our magnetic field gradiometer is sufficiently sensitive and resilient to be employed in biomagnetic applications. In particular, we are able to record the auditory evoked response of the human brain, and to perform real-time magnetocardiography in the presence of external magnetic field disturbances. Our gradiometer provides complementary capabilities in human biomagnetic sensing to optically pumped magnetometers, and opens new avenues in the detection of human biomagnetism.",

keywords = "magnetoencephalography, nonlinear magneto-optical rotation, optically pumped magnetic gradiometer, auditory evoked response, optically pumped magnetometer",

author = "Harry Cook and Yulia Bezsudnova and Koponen, {Lari M} and Ole Jensen and Giovanni Barontini and Kowalczyk, {Anna U}",

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AU - Cook, Harry

AU - Bezsudnova, Yulia

AU - Koponen, Lari M

AU - Jensen, Ole

AU - Barontini, Giovanni

AU - Kowalczyk, Anna U

PY - 2024/4/26

Y1 - 2024/4/26

N2 - We realise an intrinsic optically pumped magnetic gradiometer based on non-linear magneto-optical rotation. We show that our sensor can reach a gradiometric sensitivity of 18 fT cm−1√Hz−1 and can reject common mode homogeneous magnetic field noise with up to 30 dB attenuation. We demonstrate that our magnetic field gradiometer is sufficiently sensitive and resilient to be employed in biomagnetic applications. In particular, we are able to record the auditory evoked response of the human brain, and to perform real-time magnetocardiography in the presence of external magnetic field disturbances. Our gradiometer provides complementary capabilities in human biomagnetic sensing to optically pumped magnetometers, and opens new avenues in the detection of human biomagnetism.

AB - We realise an intrinsic optically pumped magnetic gradiometer based on non-linear magneto-optical rotation. We show that our sensor can reach a gradiometric sensitivity of 18 fT cm−1√Hz−1 and can reject common mode homogeneous magnetic field noise with up to 30 dB attenuation. We demonstrate that our magnetic field gradiometer is sufficiently sensitive and resilient to be employed in biomagnetic applications. In particular, we are able to record the auditory evoked response of the human brain, and to perform real-time magnetocardiography in the presence of external magnetic field disturbances. Our gradiometer provides complementary capabilities in human biomagnetic sensing to optically pumped magnetometers, and opens new avenues in the detection of human biomagnetism.

KW - magnetoencephalography

KW - nonlinear magneto-optical rotation

KW - optically pumped magnetic gradiometer

KW - auditory evoked response

KW - optically pumped magnetometer

U2 - 10.1088/2058-9565/ad3d81

DO - 10.1088/2058-9565/ad3d81

M3 - Article

SN - 2058-9565

VL - 9

JO - IOP Quantum Science and Technology

JF - IOP Quantum Science and Technology

IS - 3

M1 - 035016

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An optically pumped magnetic gradiometer for the detection of human biomagnetism

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Keywords

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Projects

Attention to Reading

Hybridised quantum sensors for enhanced magnetoencephalography

STIMUSURE - Simultaneous magnetic brain stimulation and measurement

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