In this paper, we theoretically and numerically reported a dual plasmon-induced transparency and the relevant sensing property in a multi-cross metasurface by the coupled mode analysis. A phase coupling model was established to characterize the optical response of this plasmonic sensor. It was found that the transparency windows were sensitive to the resonance mode of each metal strip, which was well demonstrated by the theoretical model. Both the sensing property and the slow light in this structure were discussed. A high figure of merit of 223 and sensitivity of 850 nm/RIU were achieved. In addition, the 1170-nm near-infrared light can be slowed down by nearly two order of magnitude with group delay of 0.45 ps in this sensor. These results may provide guidance for light-matter interaction-enhanced slow-light sensor and integrated optical circuit design.

中文翻译：

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基于近红外超表面的慢光等离子体传感器耦合模式演示

在本文中，我们在理论上和数值上通过耦合模式分析报告了双等离激元诱导的透明性和在多交叉超表面中的相关传感特性。建立了相位耦合模型来表征该等离子体传感器的光学响应。发现透明窗对每个金属带的共振模式敏感，这在理论模型中得到了很好的证明。讨论了该结构的感测特性和慢光。获得了223的高品质因数和850 nm / RIU的灵敏度。此外，此传感器中的1170 nm近红外光可以减慢近两个数量级，群延迟为0.45 ps。