The present invention is a novel method and computer program product which utilizes an interface capacitor formed by the metal of the probe tip, a dielectric layer, such as an oxide, formed by a contaminant on a solder bump and the metal of the solder bump. Pixelated data is first resampled to an efficient word size\u2014typically 8-bits wide. The support may be placed adjacent to a computer keyboard or mouse to function as a wrist rest. A waveguide is positioned adjacent to the signal source to couple the optical signal to the waveguide.