Systems for treating contaminated soil are described herein. The tracking system includes first and second sensors for sensing an object in first and second fields of view, respectively. Additionally, the electrical stimuli bias minimizes electrical potential difference between the one or more released current carrying elements and one or more non-current carrying elements mounted above the supporting substrate that come in contact or close proximity during operation of the one or more released current carrying elements. A method for producing a light-guiding structure comprising forming in a substrate a cladding layer having a top substrate surface and a porosity value; and forming in the substrate a waveguide core layer in contact with the cladding layer and having a porosity value less than the porosity value of the cladding layer.