1 Faculty of Physics Babes-Bolyai University M. Kogalniceanu 1, Cluj-Napoca Romania Advanced Materials and Applied Technologies Laboratory Institute of Research-Development-Innovation in Applied Natural Sciences Babes-Bolyai University Fantanele 30, Cluj-Napoca Romania.
2 Laboratory Optical Processes in Nanostructured Materials National Institute of Materials Physics Atomistilor 405 A, Bucharest Romania.
3 Civil and Environmental Engineering Department University of Perugia Strada di Pentima 4, Terni Italy.
4 Faculty of Physics Babes-Bolyai University M. Kogalniceanu 1, 400084 Cluj-Napoca Romania Advanced Materials and Applied Technologies Laboratory Institute of Research-Development-Innovation in Applied Natural Sciences Babes-Bolyai University Fantanele 30, Cluj-Napoca Romania.