Numerical simulation of the ultra-fast-laser heating conduction by Lattice Boltzmann method

Abstract Ultra-fast laser heating technology has been widely used in the micro-/nano- devices. The Lattice Boltzmann method (LBM) is employed to simulate the heat conductions of laser heating appeared in a thin film. The results obtained by the LBM show that a wavelike behavior is appeared, but it can not be found in Fourier prediction. Comparing the results obtained by the Fourier law and LBM, we find that the LBM solution shows higher temperature than the Fourier prediction. Moreover, simultaneously heating both surfaces of a thin silicon film by ultra-fast lasers can induce two thermal waves traveling in the opposite directions, and when they meet together, the energy will enhance significantly.