I am studying  nanoparticles in an optical trap of laser tweezers. The optical forces experienced by the nanoparticles can be controlled with the polarization of the light in a manner that the particles are set into rotational motion. The controlled rotation may be  applied in biology, for example in determination of the viscosity properties of cells. I am interested especially in metallic nanoparticles due to their strong interaction with light at the localized surface plasmon resonance (LSPR) frequency. The plasmonic phenomena relate to my PhD thesis about metallic thin film structures and polarization shaping gratings.