Efficient excitation of dielectric-loaded surface plasmon-polariton waveguide modes at telecommunication wavelengths

Tobias Holmgaard, Sergey I. Bozhevolnyi, Laurent Markey, Alain Dereux, Alexey V. Krasavin, Padraig Bolger, Anatoly V. Zayats

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Abstract

The excitation of surface plasmon-polariton (SPP) waveguide modes in subwavelength dielectric ridges deposited on a thin gold film has been characterized and optimized at telecommunication wavelengths. The experimental data on the electromagnetic mode structure obtained using scanning near-field optical microscopy have been directly compared to full vectorial three-dimensional finite element method simulations. Two excitation geometries have been investigated where SPPs are excited outside or inside the dielectric tapered region adjoint to the waveguide. The dependence of the efficiency of the SPP guided mode excitation on the taper opening angle has been measured and modeled. Single-mode guiding and strong lateral mode confinement of dielectric-loaded SPP waveguide modes have been characterized with the near-field measurements and compared to the effective-index method model.

Original languageEnglish
Article number165431
Number of pages8
JournalPhysical Review B (Condensed Matter)
Volume78
Issue number16
DOIs
Publication statusPublished - 31 Oct 2008

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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