A wireless electrical power metering system is provided. The plug arrangement includes a first plug portion including a plurality of electric contacts and a second plug portion. The channel further includes a layer of carbon-containing material overlying the delta-doped layer, and configured to prevent back diffusion of dopants from the delta-doped layer and semiconductor substrate. The refractive pattern is disposed at a boundary surface between the first layer and the second layer and has ridges and furrows that change a traveling path of light. Finally, the first liquid metal interface includes liquid metal which is contained in the first well. The method can also be accomplished with a cutting device to create a plurality of barbs on the exterior of surgical suture.