Polymethylmethacrylate (PMMA, 350k) was obtained from Aldrich, USA. Coumarin dyestuffs MACROLEX Fluorescent Red G and MACROLEX Fluorescent Yellow 10 GN were obtained from Bayer, Germany. Spherical AgNPs and AuNPs with average particle diameters 60 and 100 nm were obtained from Aldrich (USA). HPLC grade Dichloromethane (CH2Cl2) was obtained from Aldrich (USA) and used as high purity solvent for PMMA grains. Transparent Polycarbonate (PC) sheets of 3 mm thickness were obtained from Rohm (Germany).