Influence of secondary tip shape on illumination-mode near-field scanning optical microscopy images

Citation
Lj. Richter et al., Influence of secondary tip shape on illumination-mode near-field scanning optical microscopy images, J OPT SOC A, 16(8), 1999, pp. 1936-1946
Citations number
24
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Optics & Acoustics
Journal title
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION
ISSN journal
1084-7529 → ACNP
Volume
16
Issue
8
Year of publication
1999
Pages
1936 - 1946
Database
ISI
SICI code
1084-7529(199908)16:8<1936:IOSTSO>2.0.ZU;2-2
Abstract
We report illumination-mode near-field optical microscopy images of individ ual 80-115-nm-diameter Au particles recorded with metal-coated fiber probes . It is found that the images are strongly influenced by the metal-coating thickness. This dependence is consistent with theoretical models, which are in good agreement with the experimental images. Probes with thick coatings (similar to lambda/2) produce images consisting of three extrema, owing to a resonancelike polarization of the probe end. Probes with thinner coating s generally produce simpler images. However, in some cases the images conta in wavelike structures that are due to interference between direct radiatio n from the tip and propagating tip fields scattered by the particles. (C) 1 999 Optical society of America [S0740-3232(99)01208-9].