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

Ralph Pohl, C.W. Visser, Gerardus Richardus, Bernardus, Engelina Römer, C. Sun, Bert Huis in 't Veld, Detlef Lohse

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

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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

Fingerprint

ejection
high resolution
fluence
lasers
gold
YAG lasers
magnification
printing
sprayers
pulsed lasers
illumination
microscopes
lenses
fragments
tubes
physics
radii
thresholds

Keywords

  • METIS-304373
  • IR-91602

Cite this

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
Pohl, Ralph ; Visser, C.W. ; Römer, Gerardus Richardus, Bernardus, Engelina ; Sun, C. ; Huis in 't Veld, Bert ; Lohse, Detlef. / High-resolution imaging of ejection dynamics in laser-induced forward transfer. Laser Applications in Microelectronic and Optoelectronic Manufacturing (LAMOM) XIX. editor / Yoshiki Nakata ; Xianfan Xianfan ; Stephan Roth ; Beat Neuenschwander. San Francisco, CA, USA : SPIE, 2014. pp. - (Proceedings of SPIE - the international society for optical engineering).
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title = "High-resolution imaging of ejection dynamics in laser-induced forward transfer",
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. {\circledC} (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only",
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author = "Ralph Pohl and C.W. Visser and R{\"o}mer, {Gerardus Richardus, Bernardus, Engelina} and C. Sun and {Huis in 't Veld}, Bert and Detlef Lohse",
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Pohl, R, Visser, CW, Römer, GRBE, 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. Proceedings of SPIE - the international society for optical engineering, vol. 8967, SPIE, San Francisco, CA, USA, pp. -. https://doi.org/10.1117/12.2037231

High-resolution imaging of ejection dynamics in laser-induced forward transfer. / Pohl, Ralph; Visser, C.W.; Römer, Gerardus Richardus, Bernardus, Engelina; Sun, C.; Huis in 't Veld, Bert; Lohse, Detlef.

Laser Applications in Microelectronic and Optoelectronic Manufacturing (LAMOM) XIX. ed. / Yoshiki Nakata; Xianfan Xianfan; Stephan Roth; Beat Neuenschwander. San Francisco, CA, USA : SPIE, 2014. p. - (Proceedings of SPIE - the international society for optical engineering; Vol. 8967).

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

TY - GEN

T1 - High-resolution imaging of ejection dynamics in laser-induced forward transfer

AU - Pohl, Ralph

AU - Visser, C.W.

AU - Römer, Gerardus Richardus, Bernardus, Engelina

AU - Sun, C.

AU - Huis in 't Veld, Bert

AU - Lohse, Detlef

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PY - 2014/2/4

Y1 - 2014/2/4

N2 - 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

AB - 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

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KW - IR-91602

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M3 - Conference contribution

T3 - Proceedings of SPIE - the international society for optical engineering

SP - -

BT - Laser Applications in Microelectronic and Optoelectronic Manufacturing (LAMOM) XIX

A2 - Nakata, Yoshiki

A2 - Xianfan, Xianfan

A2 - Roth, Stephan

A2 - Neuenschwander, Beat

PB - SPIE

CY - San Francisco, CA, USA

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