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Optical scattering resonances of single plasmonic nanoantennas

O. L. Muskens·J. Gomez Rivas·V. Giannini·J. A. Sanchez-Gil
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Abstract

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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O. L. Muskens, J. Gomez Rivas, V. Giannini, J. A. Sanchez-Gil. 2007-06-26. Optical scattering resonances of single plasmonic nanoantennas. https://doi.org/10.1364/oe.15.017736

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