1. State
Key Laboratory of Modern Optical Instrumentation, Department of Optical
Engineering, Zhejiang University, Hangzhou 310027, Zhejiang, China
2. MacDiarmid
Institute for Advanced Materials and Nanotechnology, Department of
Physics, University of Otago, P.O. Box 56, Dunedin 9016, New Zealand
3. School
of Information and Communication Technology, Royal Institute of Technology, Electrum 229, Kista 16440, Sweden