An electrode for a plasma arc torch and method of fabricating the same are disclosed, and wherein the electrode comprises a copper holder defining a cavity in a forward end. The transition from white to black pixel color occurs as two cantilevers covering the pixel area are electrostatically turned from their position parallel to the substrate plane to the position normal to the substrate plane. The methods of formation include low temperature processes, particularly CVD using a remote plasma generator and atomic layer deposition using selective incorporation of nitrogen in the cyclic process. The extract can be used for preparing drugs or food containing antioxidants, or used for improving metabolic syndrome or eyesight.