Surface plasmon on aluminum concentric rings arranged in a long-range periodic structure
Applied Physics Letters, ISSN: 0003-6951, Vol: 92, Issue: 25
2008
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Article Description
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. © 2008 American Institute of Physics.
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