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Proceedings Paper

Excitation and propagation of surface plasmons on metallic nanowires
Author(s): Xiaorui Tian; Ning Liu; Hong Wei; Hongxing Xu
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Paper Abstract

The comprehensive understanding of the excitation and propagation of surface plasmons (SPs) on metallic nanowires (NWs) is essential for potential applications of these materials as nanoscale optical waveguides. Combining theory and different experimental methods, we did intensive study on the excitation and propagation of SP modes in crystal Ag nanowires. We found the excitation of NW SP modes is strongly affected by the excitation configuration. When an optically “thick” NW is radiated at the end of the NW, several SP modes could be excited simultaneously with appropriate incident polarization. If the NW is in the medium of uniform refractive index, the coherent superposition of these SP modes generates chiral SPs in single NW, and the handedness of the chiral SPs can be controlled by the input polarization angle. When we use a near field scanning optical fiber tip to excite the SPs on metallic nanowires from the middle of the NW, we also found multiple SP modes in the NWs can be excited through polarization selective near field interaction. The excitation mechanism of the tip-induced SP propagation is quite different from the previous wire-endlaunching scheme. We found the input coupling efficiency is modulated by Fabry-Pérot interferences in the near field coupling case.

Paper Details

Date Published: 9 October 2012
PDF: 8 pages
Proc. SPIE 8457, Plasmonics: Metallic Nanostructures and Their Optical Properties X, 84571N (9 October 2012); doi: 10.1117/12.931298
Show Author Affiliations
Xiaorui Tian, Beijing National Lab. for Condensed Matter Physics and Institute of Physics (China)
Ning Liu, Beijing National Lab. for Condensed Matter Physics and Institute of Physics (China)
Hong Wei, Beijing National Lab. for Condensed Matter Physics and Institute of Physics (China)
Hongxing Xu, Beijing National Lab. for Condensed Matter Physics and Institute of Physics (China)
Lund Univ. (Sweden)


Published in SPIE Proceedings Vol. 8457:
Plasmonics: Metallic Nanostructures and Their Optical Properties X
Mark I. Stockman, Editor(s)

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