Surface plasmon on aluminum concentric rings arranged in a long-range periodic structure

被引：8
作者：
Chang, Yi-Tsung [1 ]
Tzuang, Dah-Ching [1 ]
Wu, Yi-Ting [1 ]
Chan, Chi-Feng [1 ]
Ye, Yi-Han [1 ]
Hung, Ting-Hsiang [1 ]
Chen, Yu-Fan [1 ]
Lee, Si-Chen [1 ]
机构：
[1] Natl Taiwan Univ, Grad Inst Elect Engn, Dept Elect Engn, Taipei 10617, Taiwan
来源：
APPLIED PHYSICS LETTERS | 2008年 / 92卷 / 25期
关键词：
D O I：
10.1063/1.2949743
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The enhanced optical transmission through the annular aluminum metal with different number of concentric rings arranged in a long-range periodic structure on the silicon substrate is investigated. The measured transmission spectra demonstrate that the surface plasmon modes depend sensitively on the structural parameters of the metallic rings. The degenerate (1,0), (1,1), and (2,1) Al/Si surface plasmon modes are determined by the long periodicity of the structure. The localized modes in cavities with different length can be observed in this structure as well. These phenomena suggest that both surface plasmons and localized cavity modes are excited within super unit cell. (C) 2008 American Institute of Physics.
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