1. Delaware State University, Department of Physics and Engineering and Optical Science Center for Applied Research, 1200 North Dupont Highway, Dover, DE 19901 USA
2. Delaware State University, Department of Mathematical Sciences, Dover, DE 19901 USA
3. Université de Sciences et de la Technologie Houari Boumediene, Laboratoire d'Electronique Quantique, BP 32 El Alia 16111 Bab Ezzouar, Algiers, Algeria