Abstract
The relation between the near-field and far-field properties of plasmonic nanostructures that exhibit Fano resonances is investigated in detail. We show that specific features visible in the asymmetric lineshape far-field response of such structures originate from particular polarization distributions in their near-field. In particular we extract the central frequency and width of plasmonic Fano resonances and show that they cannot be directly found from far-field spectra. We also address the effect of the modes coupling onto the frequency, width, asymmetry and modulation depth of the Fano resonance. The methodology described in this article should be useful to analyze and design a broad variety of Fano plasmonic systems with tailored near-field and far-field spectral properties.
Highlights
In 1977, Ugo Fano recounted the circumstances which prompted him to develop an original formalism to describe asymmetric spectral lineshapes: ”Late in 1960, R.L
Fano resonances are built from the interference between a continuum of radiative waves and a non–radiative mode that are spectrally and spatially overlapping [3]
We have investigated the relation between the near–field and far–field properties of plasmonic nanostructures that exhibit Fano resonances
Summary
In 1977, Ugo Fano recounted the circumstances which prompted him to develop an original formalism to describe asymmetric spectral lineshapes: ”Late in 1960, R.L. “Ab initio theory of Fano resonances in plasmonic nanostructures and metamaterials,” Phys. The interference of these bright and dark modes leads to a Fano–like asymmetric resonance whose lineshape is given by [13]: σ (ω) =
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