Despite all the studies done so far in this field, the application of silver nanoparticles on photonics materials is a relatively new physical process. Therefore, it is quite normal that most of the work done so far has been devoted to the development and optimisation of the effect rather than to a deeper understanding of the mechanism of the physical process. This book discusses mechanistic aspects of the physical process between noble metallic nanoparticles on the photonics materials, which are plausible and in line with earlier and new findings of our group, as well as the comparison of these results with those of other groups.