When a dielectric particle is suspended in a liquid media of different polarizabilities and subjected to a non-uniform electric field, the particle experiences a net force (dielectrophoresis, DEP) and is either attracted to (positive DEP) or pushed away from (negative DEP) a high electric field region [23]. By employing a dipolar approximation of a particle and neglecting the influence of particle volume on the near field of the particle, the simplest formula for the DEP force can be derived as follows: