Temperature dependences of the optical properties of metal nanoparticles in various medium

The dependences of the efficiency factors of absorption, scattering and extension of radiation by spherical gold nanoparticles with radii $r_0$ = 10–125 nm in the wavelength range 400–3000 nm and tungsten nanoparticles with $r_0$ = 50–125 nm in the wavelength range 400–2500 nm are theoretically calculated and investigated. Water, fused quartz, and aluminum oxide were chosen as the environments. The influence of changes in the temperatures of nanoparticles and the environment in wide ranges on the optical factors of scattering, extension and, especially, absorption of radiation by nanoparticles is studied. A significant change in the optical parameters of the nanoparticle with changes in its temperature (including its melting) and the environment has been established, which can have a decisive influence on the dynamics of heating of the nanoparticle and subsequent thermal processes.