Electronic temperature effect on the optical properties of spheroidal metal nanoparticles
The effect of the electron temperature on both the light absorption and the scattering by metal nanoparticles (MNs) with excitation of the surface plasmon electron vibrations are studied in the framework of the kinetic theory. The formulae for the electroconductivity and polarisability tensors are derived for finite temperatures of an electron gas. The electrical conductivity and the halfwidth of the surface plasmon resonance are studied in detail for a spherical MN. Depending on the size of MN, the efficiencies of the light absorption and scattering with temperature changing are investigated. It is found, in particular, that the absorption efficiency can not only increased with a temperature decreasing, but decreases as well. Derived formulas allow to calculate analytically the various optical and transport phenomena for MNs with any spheroidal shape embedded in any dielectric media.