New Photonic Materials based on Ag Nanoparticles Modified with Stilbene Dyes and Its Peculiar Behavior Studied with SERS Topics: Molecular Photophysics and Spectroscopy; Nanophotonics and Optical Manipulation; Plasmonic Structures and Quantum Dots In Proceedings of the 7th International Conference on Photonics, Optics and Laser Technology PHOTOPTICS - Volume 1, 263-267, 2019 , Prague, Czech Republic