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

Antony Murphy, Yannick Sonnefraud, Alexey Krasavin, Pavel Ginzburg, Frances Morgan, John McPhillips, Stefan Maier, Anatoly Zayats, Robert Pollard

Research output: Contribution to journalArticlepeer-review

27 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
JournalApplied Physics Letters
Volume102
Issue number10
DOIs
Publication statusPublished - 2013

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