1. Center for International Joint Research of Electronic Materials and Systems, Henan Key Laboratory of Laser and Opto-electric Information Technology, School of Electrical and Information Engineering, Zhengzhou University, Zhengzhou, Henan 450052, P. R. China
2. Photonics Laboratory, Computer, Electrical and Mathematical Sciences and Engineering (CEMSE), King Abdullah University of Science and Technology (KAUST), Thuwal 21534, Saudi Arabia