We propose a highly sensitive sensor based on enhancing the transversal magneto-optical Kerr effect (TMOKE) through excitation of surface plasmon resonances in a novel and simple architecture, which consists of a metal grating on a metal magneto-optical layer. Detection of the change in the refractive index of the analyte medium is made by monitoring the angular shift of the Fano-like resonances associated with TMOKE. A higher resolution is obtained with this technique than with reflectance curves. The key aspect of the novel architecture is to achieve excitation of surface plasmon resonances mainly localized at the sensing layer, where interaction with the analyte occurs. This led to a high sensitivity, S = 190° RIU^–1, and high performance with a figure of merit of the order of 10³, which can be exploited in sensors and biosensors.

中文翻译：

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磁等离子体晶体中增强的横向磁光克尔效应，用于高灵敏度等离子体（生物）传感平台的设计

我们提出了一种高灵敏度的传感器，该传感器基于一种新颖，简单的结构，通过激发表面等离振子共振来增强横向磁光克尔效应（TMOKE），该传感器由金属磁光层上的金属光栅组成。通过监测与TMOKE相关的Fano类共振的角位移来检测分析物介质的折射率变化。与反射率曲线相比，使用此技术可获得更高的分辨率。该新型架构的关键方面是实现主要位于传感层的表面等离振子共振的激发，在传感层上与分析物发生相互作用。这导致了高灵敏度（S = 190°RIU ^–1）和高性能，品质因数约为10³，可以在传感器和生物传感器中使用。