Thermal, mechanical, and structural phenomena in laser material interaction by large-scale atomistic modeling

Xinwei Wang

doi:10.1117/12.596612

12 April 2005 Thermal, mechanical, and structural phenomena in laser material interaction by large-scale atomistic modeling (Invited Paper)

Xinwei Wang

Author Affiliations +

Proceedings Volume 5713, Photon Processing in Microelectronics and Photonics IV; (2005) https://doi.org/10.1117/12.596612
Event: Lasers and Applications in Science and Engineering, 2005, San Jose, California, United States

Abstract

Laser material interaction involved in laser-assisted microscale packaging is endowed with rapid and coupled optical, mechanical, and thermal processes. In-depth understanding of the underlying physics in these processes is instrumental for process optimization and functionality and dependability design of systems. This work is focused on the atomistic modeling of laser material interaction, particularly about the phase change, nanoparticle formation, stress generation and propagation, and formation and revolution of sub-surface structural damages. Large-scale parallel molecular dynamics simulation is conducted to model over 200 millions of atoms. The result reveals no clear interface when phase change occurs, but a transition region where the solid and liquid structures co-exist. The solid-liquid interface is found to move with a velocity up to the local sound speed. A vapor and droplet mixture is ejected from the surface with a high speed. The simulation reveals that nanoparticles originate from an intense vapor phase explosion after laser heating. The emerging time of larger particles is much later than that associated with smaller clusters. The resulting nanoparticles are characterized with a gas-like structure while characteristics of liquid are also preserved to a certain degree. In laser-assisted surface nanoscale structuring, visible sub-surface nanoscale structural damages are observed in the direction of 45 degrees with respect to the laser incident direction. Detailed study of the lattice structure reveals atomic dislocation in the damaged regions. Both temporary and permanent structural damages are observed in the material.

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Xinwei Wang "Thermal, mechanical, and structural phenomena in laser material interaction by large-scale atomistic modeling (Invited Paper)", Proc. SPIE 5713, Photon Processing in Microelectronics and Photonics IV, (12 April 2005); https://doi.org/10.1117/12.596612

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KEYWORDS

Picosecond phenomena

Chemical species

Nanoparticles

Particles

Liquids

Pulsed laser operation

Optical simulations

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