Use of optoelectronic tweezers in manufacturing – accurate solder bead positioning

Zhang, S., Liu, Y., Juvert, J., Tian, P., Navarro, J.-C., Cooper, J. M. and Neale, S. L. (2016) Use of optoelectronic tweezers in manufacturing – accurate solder bead positioning. Applied Physics Letters, 109(22), 221110. (doi:10.1063/1.4971348)

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Abstract

In this work, we analyze the use of optoelectronic tweezers (OETs) to manipulate 45 μm diameter Sn62Pb36Ag2 solder beads with light-induced dielectrophoresis force and we demonstrate high positioning accuracy. It was found that the positional deviation of the solder beads increases with the increase of the trap size. To clarify the underlying mechanism, simulations based on the integration of the Maxwell stress tensor were used to study the force profiles of OET traps with different sizes. It was found that the solder beads felt a 0.1 nN static friction or stiction force due to electrical forces pulling them towards the surface and that this force is not dependent on the size of the trap. The stiction limits the positioning accuracy; however, we show that by choosing a trap that is just larger than the solder bead sub-micron positional accuracy can be achieved.

Item Type:Articles
Additional Information:This work was also funded by EPSRC award EP/L00044X to the University of Southampton.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Cooper, Professor Jonathan and Juvert, Dr Joan and Zhang, Dr Shuailong and Neale, Dr Steven
Authors: Zhang, S., Liu, Y., Juvert, J., Tian, P., Navarro, J.-C., Cooper, J. M., and Neale, S. L.
College/School:College of Science and Engineering > School of Engineering
College of Science and Engineering > School of Engineering > Biomedical Engineering
College of Science and Engineering > School of Engineering > Systems Power and Energy
Journal Name:Applied Physics Letters
Publisher:AIP Publishing
ISSN:0003-6951
ISSN (Online):1077-3118
Published Online:02 December 2016
Copyright Holders:Copyright © 2016 The Authors
First Published:First published in Applied Physics Letters 109(22):221110
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
652331Assembly of electronic components with Optoelectronic TweezersSteven NealeEngineering & Physical Sciences Research Council (EPSRC)EP/L022257/1ENG - BIOMEDICAL ENGINEERING