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

Lee J. Richter, Claire E. Jordan, Richard R. Cavanagh, Garnett W. Bryant, Ansheng Liu, Stephan J. Stranick, Christine Dolan Keating, Michael J. Natan

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

We report illumination-mode near-field optical microscopy images of individual 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 (~λ/2) produce images consisting of three extrema, owing to a resonancelike polarization of the probe end. Probes with thinner coatings generally produce simpler images. However, in some cases the images contain wavelike structures that are due to interference between direct radiation from the tip and propagating tip fields scattered by the particles.

Original languageEnglish (US)
Pages (from-to)1936-1946
Number of pages11
JournalJournal of the Optical Society of America A: Optics and Image Science, and Vision
Volume16
Issue number8
DOIs
StatePublished - Jan 1 1999

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Computer Vision and Pattern Recognition

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