“…Application of UV-visible optical absorption spectroscopy for investigation of ion-implanted polymeric materials has already been reported for the Ag + -implanted PMMA, ORMOCER, and Epoxy resin [31,34,[56][57][58][59] as well as for the C + , N + , and Ar + -implanted PMMA [29,30]. It has been suggested by the authors that ion irradiation creates compact carbonaceous clusters in polymers, which may also be responsible for a narrowing of optical band gap, enhanced electrical conductivity, and increasing optical absorbance (for example, see [31,34,56]). In the case of the investigated B:PMMA, it is found the gradual increase of absorbance at lower fluences (<10 16 ions/cm 2 ) and saturation of absorbance at higher fluences (>10 16 ions/cm 2 ) as shown in Figure 6 [36].…”