Author Affiliations

Fei Lou,^a,* Zhechao Wang,^b Daoxin Dai,^c,d Lars Thylen,^a,c,e and Lech Wosinski^a,c

^aLaboratory of Photonics and Microwave Engineering, Royal Institute of Technology (KTH), Electrum 229, 164 40 Kista, Sweden

^bPhotonics Research Group, Department of Information Technology, Ghent University-IMEC, Sint-Pietersnieuwstraat 41, B-9000 Ghent, Belgium

^cJORCEP [Joint research Center of Photonics of the Royal Institute of Technology (KTH) and Zhejiang University], Zhejiang University, Zijingang Campus, Hangzhou, 310058, China

^dCentre for Optical and Electromagnetic research, State Key Laboratory for Modern Optical Instrumentation, Zhejiang University, Zijingang Campus, Hangzhou, 310058, China

^eHewlett-Packard Laboratories, Palo Alto, California 94304 USA

^*Corresponding author: flou@kth.se