Bsawmaii Laure, Giraud Pascal, El Haber Gerges, Halagacka Lukas, Chatelon Jean-Pierre, Jamon Damien, Jourlin Yves, Royer François
Université Jean Monnet Saint Etienne, CNRS, Institut d'optique Graduate School, Laboratoire Hubert Curien UMR 5516, F-42023 Saint-Etienne, France.
Faculty of Materials Science and Technology, VSB - Technical University of Ostrava, 17 Listopadu 15, 708 00 Ostrava-Poruba, Czech Republic.
Nanophotonics. 2024 Jun 6;13(19):3689-3698. doi: 10.1515/nanoph-2024-0136. eCollection 2024 Aug.
This paper introduces a novel class of low-loss and cost-effective optical planar structures tailored for magnetic detection applications. These structures represent unconventional magneto-plasmonic devices specifically optimized for an 'optical switch' configuration. The structure consists of a 1D deep sinusoidal gold grating covered by a thin cobalt layer. In this unique arrangement, the excited plasmon induces a high-contrast switching phenomenon between the reflected free space intensity of specular (0th) and -1st diffracted orders, sensitive to any transverse magnetic fields applied to the cobalt layer. The use of these two distinct diffracted orders induces differential measurements, effectively mitigating common drift and perturbations. This innovative approach results in an enhanced detection sensitivity, showcasing the potential of these structures for advanced magnetic field sensing applications.
本文介绍了一类新型的低损耗且经济高效的光学平面结构，专为磁检测应用量身定制。这些结构代表了非常规的磁等离子体器件，特别针对“光开关”配置进行了优化。该结构由覆盖着一层薄钴层的一维深正弦形金光栅组成。在这种独特的排列中，激发的等离子体在镜面（第0级）和 -1级衍射级的反射自由空间强度之间引发了高对比度的开关现象，对施加到钴层的任何横向磁场敏感。使用这两个不同的衍射级进行差分测量，有效减轻了常见的漂移和扰动。这种创新方法提高了检测灵敏度，展示了这些结构在先进磁场传感应用中的潜力。
