Equal intensity double plasmon resonance of bimetallic quasi-nanocomposites based on sandwich geometry
Equal intensity double plasmon resonance of bimetallic quasi-nanocomposites based on sandwich geometry
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DOI：
10.1088/0957-4484/19/22/225302
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发表时间：
2008-06
期刊：
影响因子：
3.5
通讯作者：
V. Chakravadhanula;M. Elbahri;U. Schürmann;H. Takele;H. Greve;V. Zaporojtchenko;F. Faupel
中科院分区：
文献类型：
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作者：
V. Chakravadhanula;M. Elbahri;U. Schürmann;H. Takele;H. Greve;V. Zaporojtchenko;F. Faupel
我们报告了一种基于三明治几何结构的等强度双等离子体共振（EIDPR）材料的制备方法。研究了三明治结构中不同金属团簇（Au/Ag）在Teflon AF（TAF）上局域等离子体共振的相互作用。通过调整Au/Ag的量和改变TAF厚度来完成EIDPR的工程设计。用透射电子显微镜（TEM）和紫外-可见光谱对样品进行了表征。有趣的是，与偶极-表面相互作用一致，观察到最佳EIDPR的临界势垒厚度为3.3 nm。结果清楚地显示了等离子体激元序列效应，并可视化等离子体激元衰变的作用。
We report a strategy to achieve a material showing equal intensity double plasmon resonance (EIDPR) based on sandwich geometry. We studied the interaction between localized plasmon resonances associated with different metal clusters (Au/Ag) on Teflon AF (TAF) in sandwich geometry. Engineering the EIDPR was done by tailoring the amount of Au/Ag and changing the TAF thickness. The samples were investigated by transmission electron microscopy (TEM) and UV–visible spectroscopy. Interestingly, and in agreement with the dipole–surface interaction, the critical barrier thickness for an optimum EIDPR was observed at 3.3 nm. The results clearly show a plasmon sequence effect and visualize the role of plasmon decay.