Prof. Maalej is presently a full professor of Physics at the University of Sfax, Tunisia. He received PhD of Physics from University of Tunis El Manar in 2001 and Habilitation HDR in 2007. He has supervised fifteen PhD theses, and co-authored more than 85 peer-reviewed scientific journals, three book chapters and six patents. He is leading a research team “Photonic and Advanced Materials”. His research interests include theoretical and experimental studies of photonic materials for emerging applications as laser glasses, optical and chemical nanosensors and forensic applications. He is actually associate editor of IEEE transactions on nanobiosciences Journal. He founded in 2022 his first startup "Fluoink nanotechnologies" which produces antibacterial nanosilver solutions to protect any surface in hospitals from nosocomial infections and pandemic contactaminations.