Coupled SPP Modes on 1D Plasmonic Gratings in Conical Mounting

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• 作者：E. Gazzola (1) (2)
  L. Brigo (3)
  G. Zacco (2) (4)
  P. Zilio (2)
  G. Ruffato (2)
  G. Brusatin (3)
  F. Romanato (1) (2) (4)
  
  1. Department of Physics and Astronomy 鈥淕. Galilei鈥? University of Padova ; Via Marzolo 8 ; Padova ; 35131 ; Italy
  2. LaNN ; Laboratory for Nanofabrication of Nanodevices ; Veneto Nanotech ; Corso Stati Uniti 4 ; Padova ; 35127 ; Italy
  3. Industrial Engineering Department and INSTM ; University of Padova ; Via Marzolo 9 ; Padova ; 35131 ; Italy
  4. Istituto Officina dei Materiali ; IOM-CNR ; Area Science Park ; Strada Statale 14 Km 163.5 ; Trieste ; 34149 ; Italy
  
• 关键词：Plasmonic gratings ; Long ; range surface plasmon polaritons ; Short ; range surface plasmon polaritons ; Conical mounting ; SPP propagation ; SPP radiative losses
• 刊名：Plasmonics
• 出版年：2014
• 出版时间：August 2014
• 年：2014
• 卷：9
• 期：4
• 页码：867-876
• 全文大小：2,110 KB
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• 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

文摘

Plasmonic nanostructures exhibit a variety of surface plasmon polariton (SPP) modes, with different characteristic properties. While a single metal dielectric interface supports a single-interface SPP mode, a thin metal film can support extended long range SPPs and strongly confined short range SPPs. When the coupling between the incident light and the SPP is provided through a diffraction grating, it is possible to azimuthally rotate the grating with respect to the scattering plane, introducing the possibility to propagate the SPP along an arbitrary direction. We present a theoretical and experimental analysis of the coupling conditions for long range and short range SPPs under this configuration. We also investigate the propagation length of the modes depending on the propagation direction with respect to the grating grooves, showing in particular that the long range SPP propagation length can be sensibly enhanced with respect to the null-azimuth case.