Physics of Fluids - Publications

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

Proc. SPIE 8967, Laser Applications in Microelectronic and Optoelectronic Manufacturing (LAMOM) XIX, 896701 (March 27, 2014) 8967, 1–7 (2014)

Authors

	Ralph Pohl
	Claas-Willem Visser
	Gertwillem R. B. E. Römer
	Chao Sun
	Albertus Huis in 't Veld
	Detlef Lohse

BibTeΧ

@proceeding{doi:10.1117/12.2037231,
author = {Pohl, R. and Visser, C. W. and Römer, G. R. B. E. and Sun, C. and Huis in 't Veld, A. J. and Lohse, D.},
title = {
High-resolution imaging of ejection dynamics in laser-induced forward transfer
},
journal = {Proc. SPIE},
volume = {8967},
number = {},
pages = {89670X-89670X-7},
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.
},
year = {2014},
doi = {10.1117/12.2037231},
URL = { http://dx.doi.org/10.1117/12.2037231},
eprint = {}
}