Surface Lattice Resonances in Plasmonic Arrays of Asymmetric Disc Dimers
Surface Lattice Resonances in Plasmonic Arrays of Asymmetric Disc Dimers
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DOI：
10.1021/acsphotonics.5b00727
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发表时间：
2016-04-01
期刊：
影响因子：
7
通讯作者：
Barnes, William L.
中科院分区：
文献类型：
--
作者：
Humphrey, Alastair D.;Meinzer, Nina;Barnes, William L.
我们研究金属二聚体的规则波长尺度阵列。通过采用由两个不同大小的光盘组成的二聚体，我们能够耦合到基于阵列的集体表面晶格共振的亮和暗，即对称和反对称，二聚体模式，并显示不对称的程度可以用来控制两个表面晶格模式的相对强度。这些激发的集体性质甚至可以导致反对称表面晶格共振，其比对称的更强;这与单个二聚体的潜在模式的暗和亮的性质形成鲜明对比。我们验证这些实验结果，来自消光测量，通过比较与分析和数值模拟。
We study regular wavelength scale arrays of metallic dimers. By employing dimers made up of two different sized discs, we are able to couple to array-based collective surface lattice resonances of both bright and dark, that is symmetric and antisymmetric, dimer modes and to show that the degree of asymmetry can be used to control the relative strength of the two surface-lattice modes. The collective nature of these excitations can even lead to an antisymmetric surface lattice resonance that is stronger than the symmetric one; this is in stark contrast to the dark and bright nature of the underlying modes of the individual dimers. We verify these experimental findings, derived from extinction measurements, by comparison with both analytical and numerical modeling.