1. Photonics Laboratory, Computer, Electrical, and Mathematical Sciences and Engineering (CEMSE), King Abdullah University of Science & Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
2. School of Microelectronics, University of Science and Technology of China, Hefei, Anhui 230026, China
3. Department of Physics, College of Science, Imam Abdulrahman Bin Faisal University, Dammam 31441, Saudi Arabia