Higher Order Plasmonic Modes Excited in Ag Triangular Nanoplates by an Electron Beam

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• 作者：V. J. Keast ; C. J. Walhout ; T. Pedersen ; N. Shahcheraghi ; M. B. Cortie…
• 刊名：Plasmonics
• 出版年：2016
• 出版时间：August 2016
• 年：2016
• 卷：11
• 期：4
• 页码：1081-1086
• 全文大小：3,930 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Biotechnology
  Nanotechnology
  Biophysics and Biomedical Physics
  Biochemistry
  
• 出版者：Springer US
• ISSN：1557-1963
• 卷排序：11

文摘

Ag triangular nanoplates are known to generate strong plasmonic resonances when excited by both light and electron beams. Experimental electron energy-loss spectra (EELS) and maps were acquired using an aberration-corrected JEOL-ARM microscope. The corner, edge and centre modes that are often observed in such structures were also observed in these measurements. In addition, novel higher order internal modes were observed and were found to be well reproduced by theoretical calculations using boundary element method (BEM). These modes are “dark modes” so are not observed in the optical extinction spectra. They are confined surface propagating modes and are analogous to laser cavity modes.KeywordsSilver nanoparticlesLocalised surface plasmon resonanceElectron energy-loss spectroscopy (EELS)Boundary element method (BEM)