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Surface-plasmon polaritons on metal-dielectric nanocomposite films

机译:金属介电纳米复合膜上的表面等离激元极化子

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We observe experimentally that the reflectances of metal-dielectric nanocomposite films in the Kretschmann configuration show different characteristics, depending on the metal fill fraction f, that fall into one of three distinct regimes. In the "metallic" regime, in which f is large, the film supports conventional surface-plasmon polaritons (SPPs), and one can tailor the properties of the SPPs by controlling the value of f. In the "dielectric" regime, in which f is small, the film does not support any surface modes. In the intermediate "lossy" regime, the nanocomposite film supports a SPP mode that is different from that of a "metallic" film. These results are explained by using an anisotropic effective medium model and mode analysis.
机译:我们从实验上观察到,金属-电介质纳米复合膜在Kretschmann构型中的反射率显示出不同的特性,具体取决于金属填充率f,它属于三种不同的体系之一。在“金属”状态下,其中f很大,该膜支撑常规的表面等离激元极化子(SPP),并且可以通过控制f的值来定制SPP的特性。在f小的“介电”状态下,该膜不支持任何表面模式。在中间的“有损”状态下,纳米复合膜支持的SPP模式与“金属”膜不同。通过使用各向异性有效介质模型和模式分析来解释这些结果。

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