利用磁通集中效应的超宽带光学机械磁力计
Ultrawide Bandwidth Optomechanical Magnetometry Using Flux Concentration
AI总结：
本文提出利用磁通集中器提升光学机械磁力计的灵敏度和带宽，将低频磁信号转换为高频信号以提高检测性能，实现亚赫兹范围内的高灵敏度测量。
摘要：
低频磁场在神经科学、导航和地球科学中承载着关键信息，但其强度较弱，难以用紧凑的室温磁力计测量。为克服这一挑战，我们结合了芯片上的光学机械磁力计和高磁导率的磁通集中器。除了提升灵敏度和带宽外，利用集中器的非线性响应将低频磁波动转换为高频信号，这在传感器本身最敏感的频率范围内。这规避了长期以来限制低频光学机械磁力计应用的技术噪声。我们的测量结果显示出灵敏度的十倍提升，并将性能扩展到亚赫兹范围，达到3 Hz下低于20 nT Hz$^{-1/2}$，0.1 Hz下低于100 nT Hz$^{-1/2}$。由于该方法不需要对底层架构进行重新设计，因此可以广泛应用于各种磁力计技术，为脑活动映射、水下导航和生物医学诊断等应用提供实用的低频传感方案。
英文摘要：
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.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
