Abstract
本文设计了一种基于磁流体的回音壁模式(Whispering Gallery Mode, WGM)微腔磁场传感方案, 并进行了实验验证. 利用WGM微泡腔天然的微流控通道, 可以直接向微腔中注入磁流体, 使磁流体与WGM倏逝场充分地相互作用. 我们通过仿真分析了注入磁流体前后WGM光场分布的变化以及微泡腔壁厚对传感灵敏度的影响; 实验上, 我们制备了微泡腔, 并进行了磁场传感实验研究. 当施加的外界磁场逐渐增大时, 磁流体的折射率随之增大, 导致微泡腔共振波长红移, 在6-22 mT的磁场强度范围内, 测得该磁场传感器的灵敏度为2.15 pm/mT, 探测极限(即最小可探测的磁场变化量)约为0.03 mT. 当磁场强度达到22 mT时, 磁流体折射率达到饱和值, 此时继续增大磁场强度, 谐振波长不再偏移. 本文制备的磁场传感器具有成本低、易于制备、可靠性高的优势, 在磁场检测领域具有重要的应用价值.
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