Interference of the surface plasmon polaritons with an Ag waveguide probed by dual-probe scanning near-field optical microscopy

R. Fujimoto, A. Kaneta, Koichi Okamoto, M. Funato, Y. Kawakami

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The propagation of surface plasmon polaritons (SPPs) on Ag waveguides with two different widths is directly observed using dual-probe scanning near-field optical microscopy (DSNOM). We find that the waveguide structure strongly affects the propagation of locally excited SPPs. SPPs in a flat plane structure spread radially, whereas SPPs in a 3.4-μm wide waveguide structure form two-dimensional interference fringes due to the multiple reflections at the side edges. The experimental results agree well with finite-difference time-domain calculations. The results suggest that the DSNOM technique can visualize the nanoscale characteristics of the SPP waves in various plasmonic waveguides.

Original languageEnglish
Pages (from-to)7372-7376
Number of pages5
JournalApplied Surface Science
Volume258
Issue number19
DOIs
Publication statusPublished - Jul 15 2012

All Science Journal Classification (ASJC) codes

  • Surfaces, Coatings and Films

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