Plasmonic hybridization between nanowires and a metallic surface: A transformation optics approach

Alexandre Aubry, Dangyuan Lei, Stefan A. Maier, John B. Pendry

Research output: Journal article publicationJournal articleAcademic researchpeer-review

77 Citations (Scopus)

Abstract

The interaction between metallic nanowires and a metal substrate is investigated by means of transformation optics. This plasmonic system is of particular interest for single molecule detection or nanolasers. By mapping such a plasmonic device onto a metal-insulator-metal infinite structure, its optical response can be fully derived analytically. In this article, the absorption cross-section of a nanowire placed close to a metallic surface is derived within and beyond the quasi-static limit. The system is shown to support several modes characterized by a different angular momentum and whose resonance red-shifts when the nanoparticle approaches the metal substrate. These resonances give rise to a drastic field enhancement (>102) within the narrow gap separating the nanoparticle from the metal surface. The case of a nanowire dimer is also investigated and is closely related to the previous configuration. More physical insights are provided especially with respect to the invisibility dips appearing in the radiative spectrum. Numerical simulations have also been performed to confirm our analytical predictions and determine their range of validity.
Original languageEnglish
Pages (from-to)3293-3308
Number of pages16
JournalACS Nano
Volume5
Issue number4
DOIs
Publication statusPublished - 26 Apr 2011
Externally publishedYes

Keywords

  • field enhancement
  • hybridization
  • invisibility dips
  • metal surface
  • nanoparticles
  • plasmonics
  • transformation optics

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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