Ferrell-Berreman Modes in Plasmonic Epsilon-near-Zero Media
Ferrell-Berreman Modes in Plasmonic Epsilon-near-Zero Media
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DOI：
10.1021/ph5003297
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发表时间：
2015-01-01
期刊：
影响因子：
7
通讯作者：
Jacob, Zubin
中科院分区：
文献类型：
--
作者：
Newman, Ward D.;Cortes, Cristian L.;Jacob, Zubin
我们在银/二氧化硅多层基ε近零（ENZ）超材料中观察到了独特的吸收共振，这与Ferrell（1958）和Berreman（1963）最初研究的薄膜的辐射体等离子体极化激元态有关。在局部有效介质中，超材料描述这些微观模式的激发的独特效果是违反直觉的，并且在复传播常数中捕获，而不是有效介电常数。我们的超材料的能带结构的理论分析表明，存在多个Ferell-Berreman分支慢光特性。证明传播常数揭示了细微的微观共振，可以导致设备的设计，其中Ferell-Berreman模式可以用于从等离子体传感到成像和吸收增强的实际应用。
We observe unique, absorption resonances in silver/silica multilayer-based epsilon-near-zero (ENZ) metamaterials that are related to radiative bulk plasmon-polariton states of thin-flims originally studied by Ferrell (1958) and Berreman (1963). In the local effective medium, metamaterial description the unique effect of the excitation of these microscopic modes is counterintuitive and captured within the complex propagation constant, not the effective dielectric permittivities. Theoretical analysis of the band structure for our metamaterials shows the existence of multiple Ferell-Berreman branches with slow light characteristics. The demonstration that the propgation constant reveals subtle microscopic resonances can lead to the design of devices where Ferell-Berreman modes can be exploited for practical applications ranging from plasmonic sensing to imaging and absorption enhancement.