1. School of Mechatronics Engineering, Daqing Normal University Xibin Xi Road, Ranghulu District, Daqing Heilongjiang 163712 China
2. Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems, School of Materials Science & Engineering, Beijing Institute of Technology Zhongguancun South Street, Haidian District, Beijing 100081 China