Breaking the Mode Degeneracy of Surface Plasmon Resonances in a Triangular System
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- 作者：Nahid Talebi ; Wilfried Sigle ; Ralf Vogelgesang ; Christoph T. Koch ; Cristina Fern谩ndez-L贸pez ; Luis M. Liz-Marz谩n ; Burcu 脰g眉t ; Melanie Rohm ; Peter A. van Aken
- 刊名：Langmuir
- 出版年：2012
- 出版时间：June 19, 2012
- 年：2012
- 卷：28
- 期：24
- 页码：8867-8873
- 全文大小：491K
- 年卷期：v.28,no.24(June 19, 2012)
- ISSN：1520-5827
文摘
In this paper, we present a systematic investigation of symmetry-breaking in the plasmonic modes of triangular gold nanoprisms. Their geometrical C3v symmetry is one of the simplest possible that allows degeneracy in the particle鈥檚 mode spectrum. It is reduced to the nondegenerate symmetries Cv or E by positioning additional, smaller gold nanoprisms in close proximity, either in a lateral or a vertical configuration. Corresponding to the lower symmetry of the system, its eigenmodes also feature lower symmetries (Cv), or preserve only the identity (E) as symmetry. We discuss how breaking the symmetry of the plasmonic system not only breaks the degeneracy of some lower order modes, but also how it alters the damping and eigenenergies of the observed Fano-type resonances.