Optical Response of Metallic Nanoparticles of Toroidal Shape
DOI:
https://doi.org/10.15407/ujpe71.7.607Keywords:
toroidal metallic nanoparticle, absorption cross-section, polarizability tensor, dielectric tensor, equivalent spheroid approach, surface plasmonic resonanceAbstract
The optical properties of toroidal-shaped metallic nanoparticles in a dielectric medium are investigated in the work. The equivalent oblate spheroid approach has been used to obtain the frequency dependences of the absorption and scattering cross-sections, as well as the diagonal components of the polarizability tensor and electric field enhancement tensor. The numerical results for the corresponding frequency dependencies are analyzed. The fact of the anomalously large splitting of the absorption and scattering cross-section maxima, which distinguishes toroidal particles from the whole class of the axisymmetric nanoparticles, has been established. The size dependences of the transverse and longitudinal frequencies of surface plasmonic resonance have been determined in the dissipation-free approximation. The influence of the toroidal shape and material of the nanoparticles as well as the material of the surrounding medium on their optical response is studied.
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