Opportunities / ENERGY, DEPARTMENT OF

TECHNOLOGY LICENSING OPPORTUNITY: Multi-Channel Atomic Magnetometer (MCAM)

Description (excerpt)

Unlike conventional multichannel atomic magnetometers that require one vapor cell and one optical system for each sensing channel, the patented Multi-Channel Atomic Magnetometer (MCAM) architecture from Los Alamos National Laboratory replaces many independent atomic magnetometers with a single shared vapor cell and optical system that simultaneously generates multiple independent sensing channels. MCAM is a non-cryogenic multi-channel optical quantum sensor in a single module that captures ultra-faint biomagnetic signals from the brain, heart and other sources with sensitivity approaching that of the cryogenic SQUID-based systems that have defined the field for decades. MCAM delivers that performance at roughly one-tenth the per-channel cost without a drop of liquid helium. The module pairs one large alkali-metal vapor cell with broad pump and probe laser beams read out by a photodiode array, providing 16 independent sensing channels in a single housing, scaling into helmet-style arrays of hundreds of channels, and flexing around the patient rather than forcing the patient into a fixed cryogenic dewar. Together, these attributes more easily allow for magnetoencephalography, magnetocardiography and magnetic-particle imaging while accelerating overall magnetic imaging workflows. Ongoing development is aimed at extending the sensing architecture from the centimeter scale characterized in the current prototype toward micrometer-scale spatial resolution, opening a path into cellular-scale magnetic imaging that current cryogenic and room-temperature arrays cannot address. How it Works The MCAM module operates on the spin-exchange relaxation-free (SERF) regime, in which atomic spins of alkali-metal atoms inside a large, sealed vapor cell are aligned by a circularly polarized broad pump laser beam through optical pumping and then interrogated by a linearly polarized broad probe beam propagating along a nearly parallel path. An external magnetic field of interest tilts the aligned atomic spins by an angle proportional to the field strength, and that tilt rotates the polarization plane of the probe beam through the Faraday effect; a photodiode array reads the optical rotation simultaneously at multiple points across the cell, with each photodiode pixel reporting on its own localized sensing volume. A buffer gas inside the cell restricts atomic motion so that the small cell volumes behind each pixel behave as independent sensing channels, a rear mirror folds the beam …

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