1. State Key Laboratory of Modern Optical Instrumentation Centre for Optical and Electromagnetics Research JORCEP (Sino-Swedish Joint Research Center of Photonics) Zhejiang University; 310058 Hangzhou P. R. China
2. School of Electrical and Electronic Engineering Nanyang Technological University; 639798 Singapore Singapore
3. CINTRA CNRS/NTU/THALES, UMI 3288 Research Techno Plaza; 50 Nanyang Drive, Border X Block 637553 Singapore Singapore
4. Institut d'Electronique, de Microélectronique et de Nanotechnologie (IEMN) CNRS UMR 8520-Université de Lille 1; 59650 Villeneuve d'Ascq France
5. College of Optoelectronic Engineering Shenzhen University Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province; Shenzhen 518060 Guangdong P. R. China