Abstract

The hot electron blast effect on the femtosecond laser-induced response of a nickel nanofilm is numerically studied by a coupled continuum-atomistic method. It is found that the hot electron blast force significantly affects the laser-induced stress waves in the nickel film, whereas the lattice temperature is much less influenced by the blast force. The simulation results for the laser ablation of the nickel film reveal that the neglect of the hot electron blast effect could significantly underestimate the ablation depth and overpredict the ablation threshold. It is also shown that the increase of ablation depth with the increasing laser fluence in the photomechanical ablation of nickel thin film mainly results from the thermal melting of the deeper material.

© 2015 Optical Society of America

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