Thermal analysis of double-layer metal films during femtosecond laser heating

A. M. Chen, Y. F. Jiang, L. Z. Sui, H. Liu, M. X. Jin, D. J. Ding

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

In this paper, the primary interest is the heat effect of the bottom-layer metal on the temperature distribution of the top-layer metal in a double-layer metal structure during femtosecond laser irradiation. The evolution of the surface electron and lattice temperature depends a lot on the thermal parameters of the substrate. The damage threshold can be increased by using a substrate material with high electron-lattice coupling factor. Next, we choose chrome as the bottom-layer material. The results of modeling show that the surface lattice temperature of top-layer gold can be reduced remarkably. For a fixed entire thickness of the double-layer film, there is an optimal proportion of top and bottom layers for which the damage threshold is the highest possible. Also, for increasing the damage threshold, a substrate with higher melting temperature should be chosen.

Original languageEnglish
Article number055503
JournalJournal of Optics
Volume13
Issue number5
DOIs
Publication statusPublished - 2011 May

Keywords

  • damage threshold
  • double-layer film
  • electron temperature
  • laser heating
  • lattice temperature
  • two-temperature model

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

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