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Laser-direct-write creation of three-dimensional OREST microcages for contact-free trapping, handling and transfer of small polarizable neutral objects in solution

: Stuke, M.; Müller, K.; Müller, T.; Hagedorn, R.; Jäger, M.; Fuhr, G.R.


Applied physics. A 81 (2005), No.5, pp.915-922
ISSN: 0340-3793
ISSN: 0721-7250
ISSN: 0947-8396 (Print)
ISSN: 1432-0630 (Online)
Journal Article
Fraunhofer IBMT ()

Contact-free handling, trapping and precise transfer of small polarizable neutral objects in solution based on dielectrophoresis is demonstrated. Laser-direct-write-created concentric aluminum ring electrode microcages are generated coaxially on top of a glass capillary that enables the direct, fast and precise transfer of specimens to and from the cage's trapping region. In this way, aggregates of pre-selected and desired size can be formed as demonstrated for pairs, triples and also larger clusters. Using a combination of two traps, which can freely be positioned with respect to each other, pairs of objects can be separated, keeping one of the constituents trapped.