Ma Yintao, Chen Yao, Yu Mingzhi, Wang Yanbin, Lu Shun, Guo Ju, Luo Guoxi, Zhao Libo, Yang Ping, Lin Qijing, Jiang Zhuangde
State Key Laboratory for Manufacturing Systems Engineering, International Joint Laboratory for Micro/Nano Manufacturing and Measurement Technologies, Xi'an Jiaotong University (Yantai) Research Institute for Intelligent Sensing Technology and Systems, Xi'an Jiaotong University, Xi'an, 710049, China.
School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an, 710049, China.
Microsyst Nanoeng. 2024 Aug 30;10(1):121. doi: 10.1038/s41378-024-00758-6.
The chip-scale hybrid optical pumping spin-exchange relaxation-free (SERF) atomic magnetometer with a single-beam arrangement has prominent applications in biomagnetic measurements because of its outstanding features, including ultrahigh sensitivity, an enhanced signal-to-noise ratio, homogeneous spin polarization and a much simpler optical configuration than other devices. In this work, a miniaturized single-beam hybrid optical pumping SERF atomic magnetometer based on a microfabricated atomic vapor cell is demonstrated. Although the optically thin Cs atoms are spin-polarized, the dense Rb atoms determine the experimental results. The enhanced signal strength and narrowed resonance linewidth are experimentally proven, which shows the superiority of the proposed magnetometer scheme. By using a differential detection scheme, we effectively suppress optical noise with an approximate five-fold improvement. Moreover, the cell temperature markedly affects the performance of the magnetometer. We systematically investigate the effects of temperature on the magnetometer parameters. The theoretical basis for these effects is explained in detail. The developed miniaturized magnetometer has an optimal magnetic sensitivity of 20 fT/Hz. The presented work provides a foundation for the chip-scale integration of ultrahighly sensitive quantum magnetometers that can be used for forward-looking magnetocardiography (MCG) and magnetoencephalography (MEG) applications.
具有单光束配置的芯片级混合光泵浦无自旋交换弛豫（SERF）原子磁力计因其卓越特性在生物磁测量中具有突出应用，这些特性包括超高灵敏度、增强的信噪比、均匀的自旋极化以及比其他设备简单得多的光学配置。在这项工作中，展示了一种基于微纳加工原子气室的小型化单光束混合光泵浦SERF原子磁力计。尽管光学厚度薄的铯原子被自旋极化，但密集的铷原子决定了实验结果。实验证明了增强的信号强度和变窄的共振线宽，这表明了所提出的磁力计方案的优越性。通过使用差分检测方案，我们有效抑制了光学噪声，提高了约五倍。此外，气室温度显著影响磁力计的性能。我们系统地研究了温度对磁力计参数的影响，并详细解释了这些影响的理论基础。所开发的小型化磁力计具有20 fT/Hz的最佳磁灵敏度。所展示的工作为可用于前瞻性磁心动图（MCG）和脑磁图（MEG）应用的超高灵敏度量子磁力计的芯片级集成奠定了基础。
