Universal Near-Field Interference Patterns of Fano Resonances in Two-Dimensional Plasmonic Crystals

详细信息    查看全文

• 作者：Yu Huang ; Lingwei Ma ; Mengjing Hou ; Zhengjun Zhang
• 关键词：Localized surface plasmon resonances ; Plasmonic crystals ; Fano resonances ; Near ; field patterns ; Constructive and destructive interferences
• 刊名：Plasmonics
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：11
• 期：5
• 页码：1377-1383
• 全文大小：2,461 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

We have demonstrated directly that the physical origin of Fano resonances in two-dimensional (2D) plasmonic crystals (PCs) is a wave-interference phenomenon. This is achieved by mapping the near-field interference patterns for low and high diffraction orders via three-dimensional finite element method (FEM) calculations. We show the near-field constructive and destructive resonances center at the corresponding Rayleigh anomaly (RA) wavelength of the lattice and lead to greatly enhanced and suppressed local electric fields around the nanoparticle, respectively. These collective resonances are generated by the coupling of localized surface plasmon resonances (LSPRs) with diffraction orders perpendicular or titled to the direction of the incident polarization, but not parallel to that. Further, it is revealed that such near-field interference patterns can apply to arbitrary 2D PCs. In addition, both the near- and far-field Fano-type spectral features are found to be continuously tuned by the lattice constants, which particularly benefit applications of PCs in enhanced sensing and emission.