Magnetic sensors are key elements in our interconnected smart society. Their sensitivity becomes essential for many applications in fields such as biomedicine, computer memories, geophysics, or space exploration. Here we present a universal way of increasing the sensitivity of magnetic sensors by surrounding them with a spherical metamaterial shell with specially designed anisotropic magnetic properties. We analytically demonstrate that the magnetic field in the sensing area is enhanced by our metamaterial shell by a known factor that depends on the shell radii ratio. When the applied field is non-uniform, as for dipolar magnetic field sources, field gradient is increased as well. A proof-of-concept experimental realization confirms the theoretical predictions. The metamaterial shell is also shown to concentrate time-dependent magnetic fields upto frequencies of 100 kHz.

译文

:磁性传感器是我们互联的智能社会的关键要素。它们的灵敏度对于生物医学,计算机存储器,地球物理学或太空探索等领域的许多应用至关重要。在这里,我们提出了一种通用的方法,通过用具有特殊设计的各向异性磁特性的球形超材料壳包围磁传感器来提高磁传感器的灵敏度。我们通过分析证明,通过我们的超材料壳,感应区域中的磁场会以取决于壳半径比的已知因子增强。当施加的磁场不均匀时,对于偶极磁场源,磁场梯度也会增加。概念证明的实验实现证实了理论预测。还显示了超材料壳会集中随时间变化的磁场,直至100 kHz的频率。

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