1Wireless and Photonic Networks Research Centre, Faculty of Engineering, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia
2Department of Physics, Faculty of Science, Universiti Putra Malaysia, Serdang, Selangor, Malaysia
3Department of Physics, Faculty of Science, Autonomous University of Mexico State, C.P. 50000 Toluca, Mexico
4Faculty of Electrical Engineering, Czestochowa University of Technology, Armii Krajowej 17, PL-42-217 Czestochowa, Poland
5Departamento de Física, Universidad Autónoma Metropolitana-Iztapalapa, P.O. Box 55-534, México D.F. 09340, Mexico