Negative index materials based on metal nanoclusters
Negative index materials based on metal nanoclusters
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DOI：
10.1063/1.2912529
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发表时间：
2008-04
影响因子：
4
通讯作者：
Qi Wu;W. Park
中科院分区：
文献类型：
--
作者：
Qi Wu;W. Park
我们提出了一种基于金属纳米团簇的负折射率超材料结构。纳米团簇支持磁Mie共振并表现出负磁导率，其可以与负介电常数组合以实现负折射率。我们展示了两种设计，使用银纳米团簇与银膜或银涂层纳米线在光频区。通过在银膜之间掺杂纳米团簇，实现了-1的折射率和2的品质因数。我们的模拟表明，由于其可调的工作频率和材料成分的选择自由度，在使用金属纳米团簇构建负折射率材料的灵活性。
We present a negative index metamaterial architecture based on metal nanoclusters. The nanoclusters support magnetic Mie resonances and exhibit negative permeability, which can be combined with negative permittivity to achieve negative refractive index. We demonstrate two designs using silver nanoclusters with either silver films or silver coated nanowires in optical frequency region. Refractive index of −1 and figure of merit of 2 are achieved by sandwiching nanoclusters between silver films. Our simulations show the flexibility in constructing negative index materials using metal nanoclusters due to their tunable operating frequencies and the freedom in the choice of the material compositions.