The combination of organics and metals in a composite film holds promise for combining plasmonic interaction with gain and for the realization of epsilon-near-zero (ENZ) metamaterials. In particular, fluorescent organic dyes can be used to compensate the plasmonic losses of a homogenized metal-organic material. Here, we fabricate such films through thermal co-evaporation of silver and an organic host:guest system and investigate experimentally the resulting linear optical properties for varying metal concentrations. We extract the effective permittivity of the resulting films with ellipsometry measurements and demonstrate the formation of silver nanoparticles, resulting in strongly localized surface plasmon resonances until a percolation threshold is reached. Through enhanced light-matter interaction, we observe a maximum of the photoluminescence for a concentration of 15% in volume of metal in the composite material. These results showcase a variety of growth parameters and will be useful for the future design of gain-compensated plasmonics and ENZ metamaterials.

中文翻译：

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共蒸发金属有机混合膜的有效介电常数

复合膜中有机物和金属的结合有望将等离子体相互作用与增益结合起来，并实现ε-接近零（ENZ）超材料。特别地，荧光有机染料可用于补偿均质化的金属有机材料的等离子体损失。在这里，我们通过银和有机主体：客体系统的热共蒸发来制造此类薄膜，并实验研究了不同金属浓度下所得的线性光学性质。我们用椭偏测量法提取了所得薄膜的有效介电常数，并证明了银纳米粒子的形成，导致强烈的局部表面等离振子共振，直到达到渗滤阈值为止。通过增强光与物质的相互作用，我们观察到复合材料中金属体积浓度为15％时最大的光致发光。这些结果展示了各种生长参数，并将对增益补偿的等离激元和ENZ超材料的未来设计有用。