Microdeposition of metals by femtosecond excimer laser

I. Zergioti, S. Mailis, N. A. Vainos, C. Fotakis, S. Chen, C. P. Grigoropoulos

Research output: Contribution to journalArticlepeer-review

82 Citations (Scopus)

Abstract

Microablation and transfer of thin metal films using ultrashort, ultraviolet laser radiation has been studied. A KrF excimer laser (λ = 248 nm) having 500-fs pulse duration is coupled to a high-power image projection micromachining workstation. The laser irradiation is focused onto thin Cr films through the supporting transparent quartz substrates. Single pulses are used to completely remove the metal film. The ablated material is transferred onto a receiving target glass substrate placed parallel to the source film. Experiments were conducted in a miniature vacuum cell under a pressure of 10 -1 Torr. The distance between the source and target surfaces is variable from near-contact to several hundreds of microns. Serial writing of well-defined metal lines and isolated dots, is accomplished using the x-y sample micropositioning system. Optical microscopy and surface profilometry showed deposition of highly reproducible and well-adhering features of a few microns in width for a source-target distance in the neighborhood of 10 μm. The short pulse length limits thermal diffusion, thereby enabling superior definition of the deposited features. Metal patterns were also directly deposited via a parallel-mode mask projection scheme. In a first demonstration of this method, deposited diffractive structures were shown to produce high-quality computer-generated holograms.

Original languageEnglish
Pages (from-to)601-605
Number of pages5
JournalApplied Surface Science
Volume127-129
DOIs
Publication statusPublished - May 1998
Externally publishedYes

Keywords

  • Femtosecond excimer laser
  • Laser-induced forward transfer
  • Microablation
  • Microdeposition

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