Fabrication and optical properties of large-scale arrays of gold nanocavities based on rod-in-a-tube coaxials

A. Murphy*, Y. Sonnefraud, A. V. Krasavin, P. Ginzburg, F. Morgan, J. McPhillips, G. Wurtz, S. A. Maier, A. V. Zayats, R. Pollard

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)

Abstract

Centimeter sized arrays of gold coaxial rod-in-a tube cavities have been fabricated using anodized aluminum oxide as a template. The etching process used to create the cavities enables the production of extremely small gaps between tube and rod, on the order of 5 nm, smaller than those created by standard fabrication techniques. Normal incidence spectroscopy reveals two extinction peaks in the visible and near infrared wavelength range associated with resonant plasmonic modes excited in the structure. Numerical simulations show that the modes are associated with in-phase and out-of-phase hybridization of transverse dipolar excitations in the nanorod and in the tube.

Original languageEnglish
Article number103103
Number of pages5
JournalAPPLIED PHYSICS LETTERS
Volume102
Issue number10
DOIs
Publication statusPublished - 11 Mar 2013

Keywords

  • REFRACTIVE-INDEX
  • NANOPARTICLES
  • NANOWIRE ARRAYS
  • LITHOGRAPHY
  • ANODIC ALUMINA
  • SURFACE-PLASMON RESONANCE
  • SHAPE
  • LIGHT
  • NANORODS
  • NANOPLASMONICS

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