Zhang, S;
Juvert, J;
Cooper, JM;
Neale, SL;
(2016)
Manipulating and assembling metallic beads with Optoelectronic Tweezers.
Scientific Reports
, 6
, Article 32840. 10.1038/srep32840.
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Abstract
Optoelectronic tweezers (OET) or light-patterned dielectrophoresis (DEP) has been developed as a micromanipulation technology for controlling micro- and nano-particles with applications such as cell sorting and studying cell communications. Additionally, the capability of moving small objects accurately and assembling them into arbitrary 2D patterns also makes OET an attractive technology for microfabrication applications. In this work, we demonstrated the use of OET to manipulate conductive silver-coated Poly(methyl methacrylate) (PMMA) microspheres (50μm diameter) into tailored patterns. It was found that the microspheres could be moved at a max velocity of 3200μm/s, corresponding to 4.2 nano-newton (10−9N) DEP force, and also could be positioned with high accuracy via this DEP force. The underlying mechanism for this strong DEP force is shown by our simulations to be caused by a significant increase of the electric field close to the particles, due to the interaction between the field and the silver shells coating the microspheres. The associated increase in electrical gradient causes DEP forces that are much stronger than any previously reported for an OET device, which facilitates manipulation of the metallic microspheres efficiently without compromise in positioning accuracy and is important for applications on electronic component assembling and circuit construction.
| Type: | Article |
|---|---|
| Title: | Manipulating and assembling metallic beads with Optoelectronic Tweezers |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1038/srep32840 |
| Publisher version: | https://doi.org/10.1038/srep32840 |
| Language: | English |
| Additional information: | This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10114405 |
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