Optical scattering resonances of single and coupled dimer plasmonic nanoantennas

O.L. Muskens, V. Giannini, J.A. Sánchez-Gil, J. Gómez Rivas

Research output: Contribution to journalArticleAcademicpeer-review

136 Citations (Scopus)
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Abstract

The optical resonances of individual plasmonic dimer antennas are investigated using confocal darkfield spectroscopy. Experiments on an array of antennas with varying arm lengths and interparticle gap sizes show large spectral shifts of the plasmon modes due to a combination of geometrical resonances and plasmon hybridization. The resonances of the coupled-dimer antennas are considerably broadened compared to those of single nanorods, which is attributed to a superradiant damping of the coupled antenna modes. The scattering spectra are compared with electrodynamic model calculations that demonstrate both the near-field and far-field characteristics of a half-wave antenna.
Original languageEnglish
Pages (from-to)17736-17746
Number of pages11
JournalOptics Express
Volume15
Issue number26
DOIs
Publication statusPublished - 2007

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