Optical scattering resonances of single plasmonic nanoantennas

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.

arXiv comment4 pages, 4 figures

References in corpus (2)

• Plasmons in nearly touching metallic nanoparticles: singular response in the limit of touching dimers
• Plasmonic bandgaps and Trapped Plasmons on Nanostructured Metal Surfaces

Cited by in corpus (6)

• Nanoantennas for visible and infrared radiation
• Modified field enhancement in plasmonic nanowire dimers due to nonlocal response
• A Hertzian Plasmonic Nanodimer as an Efficient Optical Nanoantenna
• Coupled-Mode Theory of Field Enhancement in Complex Metal Nanostructures
• Impact of surface collisions on enhancement and quenching of the luminescence near the metal nanoparticles
• Photo-generated THz antennas: All-optical control of plasmonic materials