Design and optimization of tapered structure of near-field fibre probe based on finite-difference time-domain simulation

H. Nakamura, T. Sato, H. Kambe, K. Sawada, T. Saiki

Research output: Contribution to journalArticle

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The finite-difference time-domain method was employed to simulate light propagation in tapered near-field fibre probes with small metal aperture. By conducting large-volume simulations, including tapered metal-cladding waveguide and connected optical fibre waveguide, we illustrated the coupling between these guiding modes as well as the electric field distribution in the vicinity of the aperture. The high collection efficiency of a double-tapered probe was reproduced and was ascribed to the shortening of the cut-off region and the efficient coupling to the guiding mode of the optical fibre. The dependence of the efficiency on the tapered structure parameters was also examined.

Original languageEnglish
Pages (from-to)50-52
Number of pages3
JournalJournal of Microscopy
Issue number1
Publication statusPublished - 2001 May 5
Externally publishedYes



  • Aperture probe
  • Collection efficiency
  • Finite-difference time-domain (FDTD) method
  • Near-field scanning optical microscopy
  • Taper structure

ASJC Scopus subject areas

  • Pathology and Forensic Medicine
  • Histology

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