1. College of Materials Science and Engineering, Institute of Microelectronics (IME), College of Electronics and Information Engineering, Shenzhen University, Shenzhen, China
2. Dongguan Institute of Opto-Electronics, Peking University, Dongguan, China
3. Department of Electronic Engineering, Chang Gung University, Taoyuan, Taiwan
4. Department of Photonics and the Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu, Taiwan