This article introduces a novel plasmonic magnetic field sensor (MFS) that utilizes a Metal-Insulator-Metal (MIM) waveguide configuration with a W-shaped cavity filled with magnetic fluid (MF). The MFS's unique design combines the advantages of plasmonic sensing, offering a promising solution for the detection of magnetic field strength. It operates based on the inherent properties of surface plasmon polaritons and the magneto-optical properties of MF, resulting in a shift in resonant wavelength. The performance of the proposed MFS has been investigated through numerical calculation employing the finite element method (FEM). Remarkably, the MFS exhibits a maximum magnetic field sensitivity of 49.11 pm/Oe, covering a detection range from 33 Oe to 200 Oe. The recorded figure of merit (FOM) and Q-factor of the MFS are 18.39 and 18.4 respectively, attesting to its high performance and reliability. This innovation has the potential to revolutionize fields such as navigation, medical diagnostics, and robotics technologies by seamlessly integrating optical sensing into traditional devices. The proposed sensor's excellent performance, compact size, and cost-effectiveness position it as a promising technology for widespread adoption, contributing to advancements in magnetic field sensing across scientific, industrial, and technological domains.

中文翻译：

---

亚波长尺度金属-绝缘体-金属波导集成磁场传感器的数值分析

本文介绍了一种新型等离激元磁场传感器 (MFS)，它采用金属-绝缘体-金属 (MIM) 波导配置以及填充磁流体 (MF) 的 W 形腔。 MFS 的独特设计结合了等离子体传感的优点，为磁场强度检测提供了一种有前途的解决方案。它的工作原理是基于表面等离子体激元的固有特性和 MF 的磁光特性，从而导致谐振波长发生变化。所提出的 MFS 的性能已通过有限元法 (FEM) 的数值计算进行了研究。值得注意的是，MFS 的最大磁场灵敏度为 49.11 pm/Oe，检测范围为 33 Oe 至 200 Oe。 MFS 记录的品质因数 (FOM) 和 Q 因子分别为 18.39 和 18.4，证明了其高性能和可靠性。通过将光学传感无缝集成到传统设备中，这项创新有可能彻底改变导航、医疗诊断和机器人技术等领域。该传感器具有卓越的性能、紧凑的尺寸和成本效益，使其成为一项有前途的广泛采用的技术，有助于科学、工业和技术领域磁场传感的进步。