Optical properties of gold nanoparticles at laser radiation wavelengths for laser applications in nanotechnology and medicine

Investigations of laser interaction with metal (gold) nanoparticles is of a great interest for laser applications in nanotechnology, engineering, and medicine. The first problem of laser interaction is to determine the optical properties of metal nanoparticles, that determines following photophysical and photochemical processes. The calculation of efficiency factors of absorption, scattering and extinction for spherical gold nanoparticles with radiuses in the range 5-100 nm and for some laser wavelengths is performed. The estimation of absorbed laser radiation energy by gold nanoparticles, their maximal temperatures and comparison with experimental data is made. The importance of the use of correct values of optical parameters of nanoparticles is demonstrated.