An optically pumped magnetic gradiometer for the detection of human biomagnetism
Year: 2024
Type: article
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.
Source: Quantum Science and Technology
Authors: Harry Cook, Yulia Bezsudnova, Lari M Koponen, Ole Jensen, Giovanni Barontini, Anna U Kowalczyk
Institution: University of Birmingham
Language: Latvian
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,800
Awards: G2792775314, G3130021080, G434337789, Hybridised Quantum Optical Sensors for enhanced magnetoencephalography, UK National Quantum Technology Hub in Sensing and Timing, Attention to Reading, Contained Molecular Farming – Controllable Contained Systems for High Yield and Consistency, Simultaneous magnetic brain stimulation and measurement
OpenAlex ID: W4391900117