On the symmetry and topology of plasmonic eigenmodes in heptamer and hexamer nanocavities

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• 作者：Nahid Talebi (1)
  Burcu ?güt (1)
  Wilfried Sigle (1)
  Ralf Vogelgesang (2)
  Peter A. van Aken (1)
  
• 刊名：Applied Physics A: Materials Science & Processing
• 出版年：2014
• 出版时间：September 2014
• 年：2014
• 卷：116
• 期：3
• 页码：947-954
• 全文大小：6,369 KB
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• 作者单位：Nahid Talebi (1)
  Burcu ?güt (1)
  Wilfried Sigle (1)
  Ralf Vogelgesang (2)
  Peter A. van Aken (1)
  
  1. Stuttgart Center for Electron Microscopy, Max Planck Institute for Intelligent Systems, Heisenbergstr. 3, 70569, Stuttgart, Germany
  2. University of Oldenburg, Ammerl?nder Heerstr. 114-118, 26129, Oldenburg, Germany
  
• ISSN：1432-0630

文摘

Plasmonics is expected to play a key role in nanotechnology, leading to intriguing routes in many engineering and biological applications. Recently, it has been realized that toroidal resonances could be an alternative to electric and magnetic resonances, which have governed the innovation of plasmonic applications so far. In a previous contribution, we proved the existence of toroidal moments in an oligomeric void-plasmonic structure [1]. In this article, we investigate the role of topology and symmetry in decomposing the various dipolar, quadrupolar, and toroidal moments, using energy-filtering transmission electron microscopy supported by three-dimensional finite-difference time-domain method simulations. The consequences of changing the topology on the toroidal character are discussed by comparing results obtained from nanoholes forming heptamer and hexamer nanocavity systems that were drilled into a thin silver film.