[1] Sciences Faculty of Tunis, University of Tunis El Manar, 2092, Tunisia
[2] Photonics Laboratory, Tampere University, Tampere,FI-33101, Finland
[3] Physics Department, College of Sciences, University of Bisha, P.B. 551, Bisha,61922, Saudi Arabia
[4] Laboratoire de Caractérisations, Applications et Modélisation des Matériaux LR18ES08, Sciences Faculty of Tunis, University of Tunis El Manar, 2092, Tunisia