Abstract
Single metallic nanorods acting as half-wave antennas in the optical range exhibit an asymmetric, multi-resonant scattering spectrum that strongly depends on both their length and dielectric properties. Here we show that such spectral features can be easily understood in terms of Fano-like interference between adjacent plasmon resonances. On the basis of analytical and numerical results for different geometries, we demonstrate that Fano resonances may appear for such single-particle nanoantennas provided that interacting resonances overlap in both spatial and frequency domains.
Highlights
Different experimental [1,2,3,4,5] and purely theoretical [6,7,8,9,10] investigations have shown that metallic nanorods act as standing-wave resonators for localized plasmon resonances in the optical regime, exhibiting geometrical half-wavelength resonances with spectral positions depending mainly on the length of the rods
We show here that these asymmetric line profiles can be understood in terms of the so-called Fano-like interference between localized plasmon resonances that has recently been reported for a variety of coupled metal nanoparticles [19,20,21,22]
Contrary to the common assumption that interference does not play a role in the total scattering or extinction of a single metallic surface, we find good agreement with numerical results, which are attained through the separation of variables (SVM), finite element (FEM) and surface integral equation (SIEM) methods
Summary
Different experimental [1,2,3,4,5] and purely theoretical [6,7,8,9,10] investigations have shown that metallic nanorods act as standing-wave resonators for localized plasmon resonances in the optical regime, exhibiting geometrical half-wavelength resonances with spectral positions depending mainly on the length of the rods This particular type of so-called ‘optical nanoantennas’ has raised the prospect of significant improvements in fields such as photodetection [11], field-enhanced spectroscopy [12] and the control of emission direction in single-molecule light sources [13]. This indicates the need to be extremely cautious when applying the premises of standard Mie theory to particles that significantly depart from sphericity
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