Ultra-fast laser heating technology plays an pivotal role in the fabrication of micro and nano devices.Investigating the ultrafast heat transfer processes inside the target during heating is of great significance for devices thermal design.This paper employs the lattice Boltzmann method to examine the ultrafast heat transfer processes in nano-thin films.The different lattice structures are selected to compare and analyze the energy density distribution inside the thin films and the transport characteristics of phonons in the film are explored.The results indicate that,following laser heating of the nano-film,the energy is transferred in the form of"wave-like"inside the film and the overall trend is consistent between the results obtained by D2Q9 and D2Q5 models.But the numerical values obtained by D2Q9 model is slightly lower than that of D2Q5 model.Through a comparison of results obtained D1Q3 model and D2Q9 model,it is found that the energy density along the direction of film thickness is significantly different.This emphasizes that,the energy transferred along the radial direction of the thin film cannot be disregarded in the study of the ultrafast heat transfer process inside the thin film.
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