Ultrawide Bandwidth Optomechanical Magnetometry Using Flux Concentration
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arXiv
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| Format: | Preprint |
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2026
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| author | Carey, Benjamin J. Bawden, Nathaniel Gottardo, Fernando Bennett, James S. Bulla, Douglas Foster, Scott Bowen, Warwick P. |
| author_facet | Carey, Benjamin J. Bawden, Nathaniel Gottardo, Fernando Bennett, James S. Bulla, Douglas Foster, Scott Bowen, Warwick P. |
| contents | Low-frequency magnetic fields carry vital information for neuroscience, navigation, and Earth science. However, they are generally weak, making it challenging to measure them with compact, room-temperature magnetometers. To overcome this challenge, we combine an on-chip optomechanical magnetometer with a high-permeability flux concentrator. Beyond boosting sensitivity and bandwidth, exploiting the concentrator's nonlinear response converts low-frequency magnetic fluctuations into higher-frequency signals where the sensor is intrinsically most responsive. This sidesteps the technical noise that has long constrained the application of optomechanical magnetometry at low frequencies. Our measurements show order-of-magnitude improvements in sensitivity and extend performance into the sub-hertz regime, achieving below 20 nT Hz$^{-1/2}$ down to 3 Hz and less than 100 nT Hz$^{-1/2}$ at 0.1 Hz. Because this approach requires no redesign of the underlying architecture, it can be readily applied across magnetometer technologies, opening the way to practical low-frequency sensing for applications from brain activity mapping to undersea navigation and biomedical diagnostics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_23944 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Ultrawide Bandwidth Optomechanical Magnetometry Using Flux Concentration Carey, Benjamin J. Bawden, Nathaniel Gottardo, Fernando Bennett, James S. Bulla, Douglas Foster, Scott Bowen, Warwick P. Optics Applied Physics Low-frequency magnetic fields carry vital information for neuroscience, navigation, and Earth science. However, they are generally weak, making it challenging to measure them with compact, room-temperature magnetometers. To overcome this challenge, we combine an on-chip optomechanical magnetometer with a high-permeability flux concentrator. Beyond boosting sensitivity and bandwidth, exploiting the concentrator's nonlinear response converts low-frequency magnetic fluctuations into higher-frequency signals where the sensor is intrinsically most responsive. This sidesteps the technical noise that has long constrained the application of optomechanical magnetometry at low frequencies. Our measurements show order-of-magnitude improvements in sensitivity and extend performance into the sub-hertz regime, achieving below 20 nT Hz$^{-1/2}$ down to 3 Hz and less than 100 nT Hz$^{-1/2}$ at 0.1 Hz. Because this approach requires no redesign of the underlying architecture, it can be readily applied across magnetometer technologies, opening the way to practical low-frequency sensing for applications from brain activity mapping to undersea navigation and biomedical diagnostics. |
| title | Ultrawide Bandwidth Optomechanical Magnetometry Using Flux Concentration |
| topic | Optics Applied Physics |
| url | https://arxiv.org/abs/2603.23944 |