Plasmon-induced transparency by detuned magnetic atoms in trirod metamaterials.
Plasmon-induced transparency by detuned magnetic atoms in trirod metamaterials.
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DOI：
10.1364/ao.51.001879
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发表时间：
2012-04
期刊：
影响因子：
1.9
通讯作者：
P. Ding;Chunzhen Fan;Y. Cheng;E. Liang;Q. Xue
中科院分区：
文献类型：
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作者：
P. Ding;Chunzhen Fan;Y. Cheng;E. Liang;Q. Xue
我们从理论上证明了一个类似的电磁感应透明（EIT）的等离子体超材料的单位细胞组成的三个平行的金属棒。通过对三种三杆结构中局域表面等离子体共振的研究，讨论了类EIT传输的电磁机制。我们发现，周围的透明窗口两侧的传输最小值对应于两个失谐的磁共振，这分别产生于一个长杆和一个短杆之间的反相等离子体耦合和两个短杆之间。在光学区，三杆结构在透明窗口处的群速度可以降低10倍以上，并且这种类EIT响应可以用双谐振子的理论模型很好地描述。这项工作不仅揭示了由失谐的磁性“原子”组成的等离子体超材料中的EIT类传输，而且还提供了对等离子体相互作用的进一步了解，特别是对于包括多个金属元素的金属纳米结构。
We demonstrate theoretically an analog of electromagnetically induced transparency (EIT) in the plasmonic metamaterial with the unit cell consisting of three parallel metallic rods. The electromagnetic mechanism for the EIT-like transmission is discussed based on our investigation of the localized surface plasmon resonances in three trirod configurations. We find that the transmission minima surrounding the transparency window on both sides correspond to two detuned magnetic resonances, which arise respectively from the antiphase plasmon couplings between a long rod and a short rod and between two short rods. A decrease of more than 10 times in the group velocity can be achieved for the trirod structure at the transparency window in the optical regime, and the EIT-like response can be well described by the theoretical model of two harmonic oscillators. This work not only reveals the EIT-like transmission in plasmonic metamaterial consisting of detuned magnetic "atoms," but also provides further insight into the plasmons' interactions, especially for metallic nanostructures comprising multiple metallic elements.