Regensburg 2016 – scientific programme
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MA: Fachverband Magnetismus
MA 17: Poster Session I
MA 17.12: Poster
Tuesday, March 8, 2016, 09:30–12:30, Poster B1
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. However, the accuracy of detection in the original setup is limited by the resolution of the optical microscope. The combination of both methods opens up new perspectives for applications of nanoparticles in absorbing media. We present first experimental results obtained by integrating a magnetic micro-trap into an optical tweezer setup. It is demonstrated that under suitable conditions stable positioning of commercially available microbeads (Dynabeads MyOne Streptavidin T1, diameter 1 µm) in the optical tweezer can be achieved.