1. Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, School of Science, Jiangnan University, Wuxi 214122, People's Republic of China
2. School of Information and Electrical Engineering, Zhejiang University City College, Hangzhou 310015, People's Republic of China
3. Zhejiang-California International Nanosystem Institute, Electronic Department, Zhejiang University, Hangzhou 310029, People's Republic of China
4. College of Physics and Electronic Engineering Information, Wenzhou University, Chashan University Town, Wenzhou 325035, People's Republic of China