1. National Key Laboratory of Micro/Nano Fabrication Technology Key Laboratory for Thin Film and Microfabrication Technology of Ministry of Education School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University 800 Dongchuan Road Minhang District Shanghai 200240 P. R. China
2. School of Information and Control Engineering China University of Mining and Technology 1 Jinshan East Road Quanshan District Xuzhou 221008 P. R. China
3. Guangxi Key Laboratory of Optoelectronic Information Processing Guilin University of Electronic Technology 1 Jinji Road Qixing District Guilin 541004 P. R. China