Time-resolved imaging of flyer dynamics for femtosecond laser-induced backward transfer of solid polymer thin films

M. Feinaeugle* (Corresponding Author), P. Gregorčič, D. J. Heath, B. Mills, R.W. Eason

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

10 Citations (Scopus)
9 Downloads (Pure)

Abstract

We have studied the transfer regimes and dynamics of polymer flyers from laser-induced backward transfer (LIBT) via time-resolved shadowgraphy. Imaging of the flyer ejection phase of LIBT of 3.8 μm and 6.4 μm thick SU-8 polymer films on germanium and silicon carrier substrates was performed over a time delay range of 1.4–16.4 μs after arrival of the laser pulse. The experiments were carried out with 150 fs, 800 nm pulses spatially shaped using a digital micromirror device, and laser fluences of up to 3.5 J/cm2 while images were recorded via a CCD camera and a spark discharge lamp. Velocities of flyers found in the range of 6–20 m/s, and the intact and fragmented ejection regimes, were a function of donor thickness, carrier and laser fluence. The crater profile of the donor after transfer and the resulting flyer profile indicated different flyer ejection modes for Si carriers and high fluences. The results contribute to better understanding of the LIBT process, and help to determine experimental parameters for successful LIBT of intact deposits.

Original languageEnglish
Pages (from-to)1231-1238
Number of pages8
JournalApplied surface science
Volume396
DOIs
Publication statusPublished - 28 Feb 2017
Externally publishedYes

Keywords

  • Additive manufacturing
  • Femtosecond laser-induced micro-processing
  • Laser-induced backward transfer
  • Polymer thin films
  • SU-8
  • Time-resolved shadowgraphy

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