A system and method are disclosed for fast sub-pixel optical flow estimation in a two-dimensional or a three-dimensional space. The system comprises one or more light-emitting elements and a light guide in which are defined one or more voids. The gripping mechanism is operatively engaged to a piston that is fluid actuatable from a first position to a second position by a fluid acting upon the piston, such that when the piston is in the first position the gripping mechanism is in the closed position and when the piston is in the second position the gripping mechanism is in the open position. A trench spacer is formed on the substrate along a portion of sidewalls of the recess trench. The ability to assemble the converter to the processor in this way facilitates assembly compared to systems in which the converter is plugged in to the processor carrier in the direction substantially parallel to the surface of the motherboard.