Temperature Dependences of the Optical Properties of Metal Nanoparticles in Various Media

The temperature dependences of the efficiency factors of absorption, scattering, and extinction of radiation by spherical gold nanoparticles with radii r(0) = 10-125 nm in the wavelength range of 400-3000 nm and by tungsten nanoparticles with r(0) = 50-125 nm in the wavelength range of 400-2500 nm are theoretically calculated and studied. Water, fused quartz, and aluminum oxide were chosen as surrounding media. The influence of the temperature of nanoparticles and the surrounding medium on the optical factors of scattering, extinction, and, especially, absorption by nanoparticles is studied. It found that the optical parameters of a nanoparticle strongly change with its temperature (including melting) and with the temperature of the surrounding medium, which can have a decisive effect on the nanoparticle heating dynamics and subsequent thermal processes.