Effective permittivity of co-evaporated metal-organic mixed films
Effective permittivity of co-evaporated metal-organic mixed films
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DOI：
10.1063/5.0038899
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发表时间：
2021-02
影响因子：
3.2
通讯作者：
A. Mischok;N. Hale;M. Gather;A. Di Falco
中科院分区：
文献类型：
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作者：
A. Mischok;N. Hale;M. Gather;A. Di Falco
有机和金属在复合薄膜中的结合有望将等离子体相互作用与增益结合起来，并实现epsilon-near-zero （ENZ）超材料。特别是，荧光有机染料可用于补偿均质金属-有机材料的等离子体损失。在这里，我们通过银和有机主客体系统的热共蒸发制备了这种薄膜，并实验研究了不同金属浓度下产生的线性光学性质。我们通过椭偏测量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子体共振，直到达到渗透阈值。通过增强的光-物质相互作用，我们观察到复合材料中金属体积浓度为15%时的最大光致发光。这些结果展示了多种生长参数，将有助于未来设计增益补偿等离子体和ENZ超材料。
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.