Picosecond thermal pulses in thin metal films
نویسندگان
چکیده
A simplified approach is introduced to describe the thermal behavior of a thin metal film exposed to picoseconds thermal pulses. The approach is based on the assumption that the metal film thermal behavior occurs in two separate stages. In the first stage, electron gas transmits its energy to the solid lattice through electron-phonon coupling and other mechanisms of energy transport are negligible. In the second stage, electron gas and solid lattice are in thermal equilibrium, the energy transfer through electron-phonon coupling is negligible, and thermal diffusion dominates. The proposed approach eliminates the coupling between the energy equations and the reduced differential equations are easier to handle. The proposed approach applies to metal films whenever GL/Ke@1. © 1999 American Institute of Physics. @S0021-8979~99!08704-6#
منابع مشابه
Gouy phase shift of single-cycle picosecond acoustic pulses
Ultrafast laser pulses are used to generate single-cycle picosecond acoustic pulses in thin metal films on silicon. For small initial excitation spot sizes, propagation of the acoustic pulses across a 485-mm Si crystal leads to significant diffraction effects. The temporal reshaping of the acoustic wave form due to diffraction is investigated, and we demonstrate that the acoustic far field can ...
متن کاملDynamics of ultrafast reversible phase transitions in GeSb films triggered by picosecond laser pulses
Related Articles Electronic structure of buried Co-Cu interface studied with photoemission spectroscopy J. Appl. Phys. 112, 103702 (2012) Interference of surface plasmon polaritons excited at hole pairs in thin gold films Appl. Phys. Lett. 101, 201102 (2012) Effect of N2 dielectric barrier discharge treatment on the composition of very thin SiO2-like films deposited from hexamethyldisiloxane at...
متن کاملThermal Processing of Thin Films Using Ultra-short Laser Pulses Applied to Photovoltaic Materials
Ultra-short pulsed laser sources, with pulse durations in the ps and fs regime, arecommonly exploited for cold ablation. However, operating ultra-short pulsed lasersources at fluence levels well below the ablation threshold allows for fast and selectivethermal processing. The latter is especially advantageous for the processing of thinfilms. A precise control of the heat affecte...
متن کاملThe influence of wavelength on phase transformations induced by picosecond and femtosecond laser pulses in GeSb thin films
متن کامل
Modeling of Thermodiffusion Inertia in Metal Films Heated with Ultrashort Laser Pulses
Previously, we considered the analytical solution of nonlinear diffusion equation in two-dimensional surface. This allows us to consider the same nonlinear heat conduction equation for metals heated by a picosecond laser. After fast thermalization (within a few femtoseconds) of the laser energy and electron excitation in the conductivity band, electrons ballistically diffuse and transfer their ...
متن کامل