On-chip structured silicon-on-insulator vortex inducer

A fluidic device for processing a fluid or species therein is described. The device comprises a 3D channel comprising an inlet for receiving a sample fluid and an outlet for outputting the sample fluid. The channel is adapted for guiding flow of the sample fluid in an axial direction from the inlet to the outlet, the channel comprising at least two side walls. The device also comprises a controllable flow inducer comprising electrodes for inducing, when the sample fluid is flowing through the channel, a motion of the sample fluid in the channel in a plane substantially orthogonal to the axial direction. Along at least one of the side walls at least part of the electrodes are formed by alternatingly at least an electrically conducting portion, an electrically insulating portion and a further electrically conducting portion.