Abstract
The temperature dependence of refractive indices of metals influences the optical properties of metallic nanoparticles (NPs) during their laser heating. The optical factors of absorption, scattering, and extinction of the laser radiation at a wavelength of ~ 532 nm by gold nanoparticles with radii in the range of 5-100 nm have been calculated for nanoparticle temperatures in the range of 300-1336 K, including nanoparticle melting. Absorption, scattering, and extinction of radiation by nanoparticle are significantly decreased with increasing temperature. The influence of the dependence of gold nanoparticle absorption on its temperature determines the temporal behavior of nanoparticle temperature and the value of the maximal temperature. The decrease of nanoparticle absorption during its laser heating leads to the significant increase of laser fluences (intensities) initiating threshold processes like nanoparticle melting or evaporation upon reaching the maximal temperature at the end of laser action. Accounting for this impact on threshold parameters is important for laser nanotechnology applications.
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