1. Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices School of Information and Optoelectronic Science and Engineering South China Normal University Guangzhou 510006 P. R. China
2. College of Physics and Information Engineering Minnan Normal University Zhangzhou 363000 P. R. China
3. School of Engineering and Information Technology University of New South Wales Canberra ACT 2600 Australia