Kavli Affiliate: John E. Bowers
| First 5 Authors: Paolo Pintus, Paolo Pintus, , ,
| Summary:
Magnetic field sensors with high sensitivity and spatial resolution have
profoundly impacted diverse applications ranging from geo-positioning and
navigation to medical imaging, materials science, and space exploration.
However, the use of high-precision magnetometers is often limited due to their
bulky size or low energy efficiency. In this work, we present the design,
modeling and an experimental demonstration of an all-optical magnetometer based
on silicon integrated photonics heterogeneously integrated with a magneto-optic
thin film. By bonding a thin cerium-yttrium iron garnet layer onto an
integrated silicon photonic interferometer, small magnetic field fluctuations
can be detected through the non-reciprocal phase shift in the sensor. This
strategy enables more than 80 dB of dynamic range with better than
40~pT/$sqrttextHz$ sensitivity at room temperature. Importantly, by
leveraging silicon photonics, the core platform is scalable through foundry
manufacturing, and the ultra-low power requirements enable complete system
integration with on-chip lasers, detectors, and quantum elements for enhanced
sensitivity. This work provides a path to realizing a compact, scalable, room
temperature magnetometer based on integrated photonic systems, opening new
opportunities for ultra-sensitive and ultra-efficient magnetic field detectors.
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