Electric Tweezers: Positive Dielectrophoresis Based Positioning and Orientation of Nano- and Micro- Sized Particles
Brian Edwards, Nader Engheta
Our goal is the planer positioning and orientation of individual micro- and nanometer sized objects which is simultaneously touchless and applicable to many materials. We have developed a general system using positive dielectrophoretic forces. In this method, the particle responds to carefully controlled voltages on an array of electrodes. These voltages can be mathematically linked to a desired force and orientation for each nanoparticle. We use this technique to manipulate a 6 micron long 300nm diameter gold nanorod in between five electrodes spaced on a circle of 200 micron diameter. The simulation to the right demonstrates how the voltage field (in black) and the potential energy (in colored contour) can be simultaneously changed to produce force and angle on a nanorod.