Abstract
Magneto-optical tweezers have been constructed and used for studying interactions between colloids in nematic liquid crystals. We used super-paramagnetic beads which induced planar anchoring at the surface and were suitable for optical trapping as well as manipulation by external magnetic field. Depending on the thickness of the sample, attractive or repulsive forces between two immersed spheres were observed: repulsive for sample thickness comparable to the bead size, and attractive in thick samples. This behaviour corresponds to quadrupolar interaction between two beads.
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