Thermodynamics and Structural Properties of Copper Thin Film from Laser Ablation
Riser Fahdiran
Department of Physics, State University of Jakarta, Jakarta, Indonesia, 13220.
Abstract
We investigated the thermodynamics and structural change of Copper thin film irradiated by ultrafast high intensities laser. The film has dimension of 10 nm x 10 nm in lateral periodic condition and thickness 20 nm with free condition. The system is given such amount of laser energy above ablation threshold. The dynamics of the trajectories of atoms are followed using molecular dynamics simulation. At the beginning of the simulation, the system is compressive but followed by tensile pressure that break the system. Temperature and pressure properties indicated that the system are brought to non-equilibrium state. Structural analysis on the system as a function of time shows the phase change of the material, where at the end of simulation its already evaporated.
Keywords: Copper, laser ablation, structure, thermodynamics
Topic: Material Science