1. Institute
of Micro-Nano Photoelectron and Electromagnetic Technology Innovation,
School of Electronics and Information Engineering, Hebei University of Technology, Key Laboratory of Electronic Materials and Devices of Tianjin, 5340 Xiping Road, Beichen District, Tianjin, 300401, People’s Republic of China
2. Department
of Photonics and Institute of Electro-optical Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan