Rapid Electrokinetic Patterning: Manipulating Particles with Laser and Electric Field

to create individually addressable traps for micro- and nanoparticles. By projecting

reconfigurable light patterns, particles can be concentrated, manipulated and sorted in a

programmable manner. Previously, this technique has been used for trapping of various

dielectric particles. In this poster, we show that the metal nanoparticles such as gold

and silver nanospheres (40-200 nm), silver nanowires and multi-wall carbon nanotubes

can also be reversibly trapped using this method. We demonstrate application of REP in

sensitive chemical detection with Surface Enhanced Raman Spectroscopy (SERS). SERS

requires metal nanoparticles to be concentrated in a controlled manner which is achieved

by REP induced aggregation.