Issues $\rightarrow$ Volume 27, Issue 1 (2026)

Plasmonic Phenomena in Metallic and Metal–Dielectric Prismatic Nanoparticles

PAVLYSHCHE N.I.$^{1}$ and KOROTUN A.V.$^{1,2}$

$^1$Zaporizhzhia Polytechnic National University, 64 Universytetska Str., UA-69011 Zaporizhzhia, Ukraine
$^2$G.V. Kurdyumov Institute for Metal Physics of the N.A.S. of Ukraine, 36 Academician Vernadsky Blvd., UA-03142 Kyiv, Ukraine

Received / final version 13.01.2026 / 04.02.2026 Download PDF logo PDF

Abstract
The optical and plasmonic properties of the metallic and metal–dielectric nanoprisms based on an equilateral triangle are studied. The equivalent spheroid approach is used to obtain the relations for the frequency dependence of the optical characteristics of the studied nanoparticles. The calculations are performed for the frequency dependences of the diagonal components of the polarizability tensor, electric-field enhancement tensor, spectral figure of merit tensor, quality-factor tensor, as well as the extinction cross-section, and radiation efficiency. The size dependences for the frequencies of the transverse and longitudinal surface plasmonic resonances are obtained, and the corresponding estimates are given. The presence of the significant splitting of the surface-plasmonic resonance is proven, and the corresponding estimates are given. The influence of the thickness of the dielectric layer and the sizes of the prismatic metallic core on the behaviour of the studied optical characteristics of the nanostructure is analysed. The influence of the core and shell materials of the prism on the position of the extinction cross-section maxima is demonstrated. The spectral range, in which the radiation efficiency of the studied nanostructures is close to unity, is determined. The comparison of the diagonal components of the tensor optical characteristics is carried out, and the reason for the predominance of the transverse components of the electric-field enhancement, quality factor, and spectral figure of merit tensors over the corresponding longitudinal components is established. The possibilities of using the considered nanostructures to create surface-plasmonic resonance sensors and high-quality optical nanoresonators are discussed.

Keywords: metallic and metal–dielectric nanoprisms, dielectric tensor, polarizability tensor, equivalent spheroid approach, surface-plasmonic resonance, field-enhancement tensors, quality factor and spectral figure of merit, extinction cross-section.

DOI: https://doi.org/10.15407/ufm.27.01.003

Citation: N.I. Pavlyshche and A.V. Korotun, Plasmonic Phenomena in Metallic and Metal–Dielectric Prismatic Nanoparticles, Progress in Physics of Metals, 27, No. 1: 3–24 (2026)

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