Resonance plasmon linewidth oscillations in spheroidal metallic nanoparticle embedded in a dielectric matrix

Abstract

The kinetic approach is applied to calculate oscillations of a surface plasmon linewidth in a spheroidal metal nanoparticle embedded in any dielectric media. The principal attention is focused on the case, when the free electron path is much greater than the particle size. The linewidth of the plasmon resonance as a function of the particle radius, shape, dielectric constant of the surrounding medium, and the light frequency is studied in detail. It is found that the resonance plasmon linewidth oscillates with increasing both the particle size and the dielectric constant of surrounding medium. The main attention is paid to the electron surface-scattering contribution to the plasmon decay. All calculations the plasmon resonance linewidth are illustrated by the example of the Na nanoparticles with different radii. The results obtained in the kinetic approach are compared with the known ones from other models. The role of the radiative damping is discussed as well.

Light induced nucleation of metallic nanoparticles with frequency controlled shapes

“…13 However, in anisotropic nanoparticles, surface scattering can dominate strongly decreasing the product xs. [15][16][17] The available data 18 show indeed that plasmonic line widths can be comparable to their resonance frequencies, xs $ 3, where x stands for the resonance (plasmonic) frequency. Furthermore, following the preceding estimates, 2 one gets E c $ 10 6 V/cm and E x $ 30 kV/cm.…”

Temperature dependence of plasmon resonances in spheroidal metal nanoparticles

“…We have an interesting situation when the absorption crossection with the temperature lowering increases at first, reaches its peak, then decreases, and starts to increase again. These observations are explained by the conductivity of MN, which oscillate with the particle radius changing [46]. In the case of light scattering (see figure 3), the effect of MN size is more pronounced because the scattering cross-section is proportional to the square of the particle volume.…”

Nucleation of plasmonic resonance nanoparticles with a spheroidal shape

“…Останнє вiдносно слабке в сильно анiзотропних МН порiвняно з таким у сферичних МН з близькими лiнiйними розмiрами [32]. Однак в анiзотропних МН поверхневе розсiювання може домiнувати, сильно зменшуючи при цьому добуток ωτ [33,34]. Наявнi данi [34] показують, що насправдi ширини плазмонних лiнiй можуть сягати їхнiх резонансних (плазмонних) частот ωτ ∼ 3, де ω резонансна (плазмонна) частота.…”

“…Однак в анiзотропних МН поверхневе розсiювання може домiнувати, сильно зменшуючи при цьому добуток ωτ [33,34]. Наявнi данi [34] показують, що насправдi ширини плазмонних лiнiй можуть сягати їхнiх резонансних (плазмонних) частот ωτ ∼ 3, де ω резонансна (плазмонна) частота. Окрiм сказаного, користуючись попереднiми оцiнками [15], дiстаємо E c ∼ 10 6 V/cm та E ω ∼ 30 kV/cm.…”