1. State Key Laboratory of High Power Semiconductor LasersSchool of ScienceChangchun University of Science and Technology 7089 Wei-Xing Road Changchun 130022 P. R. China
2. DCA Instruments Oy Vajossuonkatu 8. FIN 20360 Turku Finland
3. School of Science and EngineeringThe Chinese University of Hong Kong Shenzhen Guangdong 518172 P. R. China
4. State Key Laboratory of Functional Materials for InformaticsShanghai Institute of Microsystem and Information TechnologyChinese Academy of Sciences 865 Changning Road Shanghai 200050 P. R. China
5. School of Information Science and TechnologyShanghaiTech University 393 Middle Huaxia Road Shanghai 201210 P. R. China
6. State Key Laboratory of Advanced Materials for Smart SensingGeneral Research Institute for Nonferrous Metals Beijing 100088 P. R. China