1. Department of Physics; Applied Optics Beijing Area Major Laboratory; Beijing Normal University; Beijing 100875 China
2. NAAM-Research Group, Department of Mathematics; Faculty of Science; King Abdulaziz University; Jeddah 21589 Saudi Arabia
3. Department of Applied Physics, School of Science; Tianjin Polytechnic University; Tianjin 300387 China
4. Department of Mathematics; Quaid-I-Azam University; Islamabad 44000 Pakistan