An influence of the adsorbed molecules layer on the localized surface plasmons in the spherical metallic nanoparticles

N. A. Smirnova; A. V. Korotun; L. M. Titov

doi:10.15407/hftp13.04.476

Authors

N. A. Smirnova National University Zaporizhzhia Polytechnic
A. V. Korotun National University Zaporizhzhia Polytechnic / G.V. Kurdyumov Institute for Metal Physics of National Academy of Sciences of Ukraine
L. M. Titov UAD Systems

DOI:

https://doi.org/10.15407/hftp13.04.476

Keywords:

composite nanoparticle, adsorbate, polarizability, absorption cross-section, scattering cross-section, surface plasmonic resonance, local density of the states

Abstract

An influence of the adsorbed molecules layer on the optical characteristics of the spherical metallic nanoparticles has been studied in the work. In order to do this one considers the additional term which takes into account the scattering of electrons at the interface between metal and adsorbate. The analytical expressions for the frequency dependences for the parameter of coherence loss due to the scattering at the interface “metal – adsorbed layer” have been obtained. It has been found that the presence of the adsorbed molecules results in the electron scattering anisotropy, and, hence, in the anisotropy of the optic response of such systems. The result of the indicated anisotropy is the appearance of the additional maximum in the infrared part of the spectrum in the frequency dependences for the optical characteristics. An evolution of the frequency dependences for the components of the polarizability tensor and the absorption cross-section and scattering cross-section for the two-layer spherical nanoparticles of the type “metal – adsorbate” under the variation of their geometrical parameters has been analyzed. It has been shown that the weak maximum of the real, imaginary parts and the module of the transverse component of the polarizability tensor and the absorption and scattering cross-sections in the infrared part of the spectrum appears due to inducing of the local density of the states by adsorbate. The reason of the shift of the maxima of the absorption cross-section and scattering cross-section for the nanoparticles of the constant sizes with the cores of different metals has been found. It has been demonstrated the existence of the small-scale oscillations at the frequency dependences for the components of the polarizability tensor and at the absorption and scattering cross-sections, caused by an oscillating contribution of the surface electron scattering. The dependence of the location and the value of the maximum of the absorption cross-section for the particle “metal – adsorbate” with the constant geometrical parameters and content on the dielectric permittivity of the medium, in which the nanoparticle is situated, has been proved.

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