Using the same procedure described before; bilayer PTLSC waveguides were prepared by spin coating of PMMA/CH2Cl2 solution (prepared as described in the previous section) on PC rectangular plates with dimensions of (20 8 0.3 cm3), the thickness of this optically active layer was 50 mm. After that PC plates were coated with a second 20 mm layer of PMMA/SiO2 nanohybrid which is very important to increase the light-pipe trapping, scratch resistant thermal and photostability of fluorescent molecules [2,3]. After each coating process the plates were left to be dry firstly at room temperature and then in an electrical furnace at 50 C for 3 h. Fig. 2 illustrates the photographs of PTLSCs waveguides doped with different AuNPs concentrations.