论文标题
超宽带和敏感的腔体光学磁力测定法
Ultra-broadband and sensitive cavity optomechanical magnetometry
论文作者
论文摘要
磁刻录机电腔提供了一种新的光学读取方法，用于室温磁力测定法。在这里，我们报告了通过将磁刻曲材料terfenol-D嵌入高质量（Q）硅芯片上的高质量（Q）光学微腔内的超敏感和超高带宽腔光光学磁力计。通过设计其物理结构，我们达到了26 pt/hz^1/2的峰值灵敏度，与最佳的低温显微镜磁力计相当，以及3〜db的带宽高达11.3 MHz。观察到了两类的磁反应，我们假设这是由Terfenol-D的结晶度产生的。这允许在单个粒子的水平上区分单晶和多结晶晶粒。我们的结果可能会实现诸如实验室芯片核磁光谱和磁导航等应用。
Magnetostrictive optomechanical cavities provide a new optically-readout approach to room temperature magnetometry. Here we report ultrasensitive and ultrahigh bandwidth cavity optomechanical magnetometers constructed by embedding a grain of the magnetostrictive material Terfenol-D within a high quality (Q) optical microcavity on a silicon chip. By engineering their physical structure, we achieve a peak sensitivity of 26 pT/Hz^1/2 comparable to the best cryogenic microscale magnetometers, along with a 3~dB bandwidth as high as 11.3 MHz. Two classes of magnetic response are observed, which we postulate arise from the crystallinity of the Terfenol-D. This allows single- and poly-crystalline grains to be distinguished at the level of a single particle. Our results may enable applications such as lab-on-chip nuclear magnetic spectroscopy and magnetic navigation.
