Opto-plasmonic tweezers for rotation and manipulation of micro/nano objects

We propose a new opto-plasmonic tweezer for trapping and fine orientation control of micro/nano objects. The device utilizes polarized light to excite resonant dipoles on the surface of an Au nanoparticle array. The large dielectrophoresis force is then created by the highly non-uniform optically induced dipole field. The orientation control is realized by adjusting the polarization direction of the incident light. Theoretical modeling, preliminary fabrication and experimental results are reported