High-resolution imaging of ejection dynamics in laser-induced forward transfer

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Abstract

Laser-induced Forward Transfer (LIFT) is a 3D direct-write method suitable for precision printing of various materials. As the ejection mechanism of picosecond LIFT has not been visualized in detail, the governing physics are not fully understood yet. Therefore, this article presents an experimental imaging study on the ejection process of gold-based LIFT. The LIFT experiments were performed using a 6.7 picosecond Yb:YAG laser source equipped with a SHG. The beam was focused onto a 200 nm thick gold donor layer. The high magnification images were obtained using bright field illumination by a 6 ns pulsed Nd:YAG laser source and a 50× long-distance microscope objective that was combined with a 200 mm tube lens. For laser fluence levels up to two times the donor-transfer-threshold, the ejection of a single droplet was observed. The typical droplet radius was estimated to be less than 3 μm. A transition of ejection features towards higher fluence, indicates a second fluence-regime in the ejection process. For higher laser fluence, the formation of an elongated gold jet was observed. This jet fragments into multiple relatively small droplets, resulting in a spray of particles on the receiving substrate. © (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only
Original languageEnglish
Title of host publicationLaser Applications in Microelectronic and Optoelectronic Manufacturing (LAMOM) XIX
EditorsYoshiki Nakata, Xianfan Xianfan, Stephan Roth, Beat Neuenschwander
Place of PublicationSan Francisco, CA, USA
PublisherSPIE
Pages-
DOIs
Publication statusPublished - 4 Feb 2014

Publication series

NameProceedings of SPIE - the international society for optical engineering
PublisherSPIE
Volume8967
ISSN (Print)0277-786X

Keywords

  • METIS-304373
  • IR-91602

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    Pohl, R., Visser, C. W., Römer, G. R. B. E., Sun, C., Huis in 't Veld, B., & Lohse, D. (2014). High-resolution imaging of ejection dynamics in laser-induced forward transfer. In Y. Nakata, X. Xianfan, S. Roth, & B. Neuenschwander (Eds.), Laser Applications in Microelectronic and Optoelectronic Manufacturing (LAMOM) XIX (pp. -). (Proceedings of SPIE - the international society for optical engineering; Vol. 8967). San Francisco, CA, USA: SPIE. https://doi.org/10.1117/12.2037231