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Proceedings Paper

Laser-induced processes on the back side of dielectric surfaces using a CuSO4-based absorber liquid
Author(s): Sarah Zehnder; Pierre Lorenz; Martin Ehrhardt; Klaus Zimmer; Patrick Schwaller
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Paper Abstract

Micro-structured dielectric surfaces in combination with electrode structures are promising in the field of rapid prototyping of micro-sensors. In this work laser-induced back side etching and back side deposition using aqueous copper sulfate in form of a tartrate complex with formaldehyde as absorber liquid has been investigated regarding this aim. Results obtained with different laser systems ranging from UV to Near-IR and with pulse lengths from femtoseconds to nanoseconds will be presented, in order to give a wide-spread overview of the different observable effects. Depending on the specific setup and laser parameters, either well-defined compact Cu deposits, micro- or nanoscaled Cu droplets or ablation of the dielectric substrate was observed. Best quality crystalline and conducting Cu structures were achieved using ns pulses at 532 nm wavelength. Droplet formation with UV excimer laser was observed. Parameters influencing each configuration will be discussed.

Paper Details

Date Published: 6 March 2014
PDF: 17 pages
Proc. SPIE 8968, Laser-based Micro- and Nanoprocessing VIII, 896812 (6 March 2014); doi: 10.1117/12.2037629
Show Author Affiliations
Sarah Zehnder, Berner Fachhochschule (Switzerland)
Pierre Lorenz, Leibniz-Institut für Oberflächenmodifizierung e.V. (Germany)
Martin Ehrhardt, Leibniz-Institut für Oberflächenmodifizierung e.V. (Germany)
Klaus Zimmer, Leibniz-Institut für Oberflächenmodifizierung e.V. (Germany)
Patrick Schwaller, Berner Fachhochschule (Switzerland)

Published in SPIE Proceedings Vol. 8968:
Laser-based Micro- and Nanoprocessing VIII
Udo Klotzbach; Kunihiko Washio; Craig B. Arnold, Editor(s)

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