Prof. Maalej is presently a full professor of Physics at the University of Sfax, Tunisia. He received MS degree in Physics from the University of Sfax in 1995 and PhD in Quantum Physics from University of Tunis El Manar in 2001 and Habilitaion HDR in 2007. He has been supervised ten PhD theses, and co-authored more than 40 peer-reviewed scientific journals. He has been invited professor in different universities in KSA, South Korea, Germany, and Portugal and given invited talks at several conferences. Currently he is leading a young research group “Photonic and Advanced Materials”. His research interests include theoretical and experimental studies of lanthanide-doped materials for emerging laser technologies, optoelectronic, temperature sensors, biosensor, and nanomedicine applications.