Simulation study on thermal effect on metal films irradiated by ultra-short pulse laser

Using the model of dual-hyperbolic two temperature, taking the gold film as example, the temperature effects on heat capacity, thermal conductivity and relaxation time have been studied with an accuracy and stability forward-difference scheme, to which one kind of artificial viscosities and adaptive time steps method is introduced. The primary researches in this paper are on the thermal response of 50 nm gold film irradiated by 0.1 ps laser pulse. The numerical results indicate that after having been heated for 0.27 ps the maximum electron temperature at the front surface occurs, after about 1.6 ps the temperature equilibration time of all electrons is achieved, while that of the whole film is got after about 60 ps. Hot-electron blast force damage could be a dominant mechanism in ultra-sho