1. Department of Opto‐Electronics and Information Engineering School of Precision Instruments and Opto‐Electronics Engineering Key Laboratory of Optoelectronic Information Science & Technology (Ministry of Education) Tianjin University Tianjin China
2. Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian Province China
3. Department of Electronic Engineering City University of Hong Kong Hong Kong China
4. Department of Engineering Pierre and Marie Curie University (University of Paris VI) Paris France