Plasmonic light scattering from nanoscopic metal tips

Linear light scattering by individual nanoscopic metal wire tips is investigated. Using evanescent-wave excitation, the spectral and polarization dependence of the emission are addressed. Choosing gold and tungsten as representative tip materials, intense scattering and a strongly plasmon-resonant b...

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Bibliographic Details
Published in:Applied physics. B, Lasers and optics Lasers and optics, 2005-03, Vol.80 (3), p.295-300
Main Authors: NEACSU, C. C, STEUDLE, G. A, RASCHKE, M. B
Format: Article
Language:English
Subjects:
Diffraction and scattering
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Gold
Light scattering
Mathematical models
Nanomaterials
Nanostructure
Optics
Physics
Spectra
Tips
Tungsten
Wave optics
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Summary:Linear light scattering by individual nanoscopic metal wire tips is investigated. Using evanescent-wave excitation, the spectral and polarization dependence of the emission are addressed. Choosing gold and tungsten as representative tip materials, intense scattering and a strongly plasmon-resonant behavior observed for gold contrasts a comparatively weak and spectrally flat response for tungsten. Spectral dependence and local-field enhancement are found to be sensitive to details of the structural parameters and can be described by a simple model. The results provide selection criteria for tips to be used in scattering-type near-field microscopy or photoemission in inelastic tunneling spectroscopy.
ISSN:0946-2171
1432-0649
DOI:10.1007/s00340-005-1748-y