期刊
APPLIED PHYSICS B-LASERS AND OPTICS
卷 80, 期 3, 页码 295-300出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s00340-005-1748-y
关键词
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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 plasmonresonant 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 for photoemission in inelastic tunneling spectroscopy.
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