1. Department of Electrical Engineering, National Central University, No.300, Jhongda Rd., Jhongli City, Taoyuan County 32001, Taiwan, R.O.C.
2. School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, No.19A Yuquan Road, Beijing 100049, China
3. The College of Materials Sciences and Opto-Electronic Technology, University of Chinese Academy of Sciences, No.19A Yuquan Road, Beijing 100049, China