Dresden 2017 – scientific programme
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MA: Fachverband Magnetismus
MA 64: Poster 1
MA 64.52: Poster
Friday, March 24, 2017, 09:30–13:00, P2-EG
Combined Optical and Magnetical Trapping of Magnetic Microbeads — •Florian Ostermaier1, Benjamin Riedmüller1, Tobias Neckernuß2, Othmar Marti2, and Ulrich Herr1 — 1Institut für Mikro- und Nanomaterialien, Universität Ulm, Ulm, Deutschland — 2Institut für Experimentelle Physik, Universität Ulm, Ulm, Deutschland
Optical tweezers have been established as a powerful tool for manipulation of particles in the range from nanometers to micrometers with sub-nanometer accuracy. On the other hand, magnetic nanoparticles are widely used for bonding and detecting biological analytes in Lab-on-Chip systems. Magnetic nanoparticles can be effectively manipulated by magnetic field gradients. In previous works, we have developed a novel method for stable positioning of superparamagnetic nanoparticles on the micro-scale using a combination of the field gradient produced by tapered conductor lines and a superimposed homogeneous magnetic field. The combination of both methods opens up new perspectives for applications of nanoparticles in absorbing media. We present first experiments aiming at integration of a magnetic micro-trap on a transparent substrate into an existing optical tweezer setup. Using commercially available microbeads (Dynabeads MyOne Streptavidin T1, diameter 1 μm) it is observed that numerous influences affect the stability of the particles in the micro-trap under standard operating conditions in the optical tweezer setup. Possible origins of the instabilities are discussed.