1. Department of Optical Science and Engineering and Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education) Fudan University Shanghai China
2. Nanjing University National Laboratory of Solid State Microstructure Nanjing China
3. Department of Physics and Astronomy and Ames Laboratory Iowa State University Ames IA USA
4. Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo China
5. Institute of Electronic Structure and Laser (IESL) FORTH Heraklion Crete Greece