1State Key Laboratory for Modern Optical Instrumentation, Center for Optical & Electromagnetic Research, College of Optical Science and Engineering, International Research Center for Advanced Photonics, Zhejiang University, Hangzhou 310058, China
2Ningbo Research Institute, Zhejiang University, Ningbo 315100, China
3Department of Physics, Indian Institute of Technology Roorkee, Roorkee-247 667 Uttarakhand, India
4Centro de Tecnologia da Informação Renato Archer-CTI, Rodovia Dom Pedro I, km 143,6, Campinas 13069-901, São Paulo, Brazil