Abstract
The generation of few-cycle laser pulses proved to be a key enabling technology in strong-field physics and ultrafast science. The question naturally arises whether one can induce few-cycle localized plasmon oscillations in optical near-fields. Here, we perform a comparative study of different plasmonic nanoresonators illuminated by few-cycle pulses. We analyze the number of cycles (NOC) of the plasmonic field, the near-field enhancement (NFE) as well as the figure of merit NFE/NOC. The pulse length dependence of these quantities is also investigated. Throughout the inspected pulse-length interval silica-gold and silica-silver core–shell monomers have the potential to preserve the NOC of the incoming pulse, silver bow-ties result in the highest NFE, whereas gold core–shell dimers have the highest NFE/NOC. Based on the analysis, silver bow-ties, gold core–shell and silver nanorod dimers proved to be the most suitable for few-cycle near-field amplification.
Highlights
The generation of few-cycle laser pulses proved to be a key enabling technology in strong-field physics and ultrafast science
It was shown that the electric field enhancement on them is higher than on metal spheres composed of either metals, the plasmonic decay dynamics is slightly different on alloy core-shells
The concept of this research is that the few-cycle characteristic of the plasmonic field can be ensured via nanoresonators, which possess broad spectral responses
Summary
The generation of few-cycle laser pulses proved to be a key enabling technology in strong-field physics and ultrafast science. Dielectric-metal core–shell type nanoresonators offer unique possibility of far-field and near-field control spanning wide spectral intervals via tailoring the plasmon hybridization promoted by two metal-dielectric interfaces[5,6]. The scattering of core–shell nanoparticles is always lower than that of a homogeneous sphere, the achievable broad bandwidth and the possibility to control the Q factor of the plasmonic resonance by varying the GAR offers the unique possibility of electric field enhancement combined with the preservation of few-cycle t ransients[8,9]. The achievable electric field enhancement and temporal evolution of the optical response were investigated on monomer and dimer Ag and Au nanoparticles as well as on silver-gold core–shell bimetal nanoparticles[11]. It was shown that the electric field enhancement on them is higher than on metal spheres composed of either metals, the plasmonic decay dynamics is slightly different on alloy core-shells
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