1. Surface plasmon on aluminum concentric rings arranged in a long-range periodic structure
- Author
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Si-Chen Lee, Dah-Ching Tzuang, Yi-Han Ye, Yi-Ting Wu, Ting-Hsiang Hung, Yu-Fan Chen, Chi-Feng Chan, and Yi-Tsung Chang
- Subjects
Materials science ,Physics and Astronomy (miscellaneous) ,Silicon ,business.industry ,Surface plasmon ,Physics::Optics ,chemistry.chemical_element ,Substrate (electronics) ,Surface plasmon polariton ,Molecular physics ,Spectral line ,Optics ,chemistry ,Excited state ,Quasiparticle ,business ,Localized surface plasmon - Abstract
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.
- Published
- 2008