Optical scattering resonances of single plasmonic nanoantennas

Details Optical scattering resonances of single plasmonic nanoantennas Optical scattering resonances of single plasmonic nanoantennas

2006-12-29

arxiv.org/abs/cond-mat/0612689v3

Physics

Condensed Matter

Materials Science

4 pages, 4 figures

Scientific paper

10.1364/OE.15.017736

We investigate the far-field optical resonances of individual dimer nanoantennas using confocal scattering spectroscopy. Experiments on a single-antenna array 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. All resonances are considerably broadened compared to those of small nanorods in the quasistatic limit, which we attribute to a greatly enhanced radiative damping of the antenna modes. The scattering spectra are compared with rigorous model calculations that demonstrate both the near-field and far-field characteristics of a half-wave antenna.

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