1. School of Science and Engineering and Shenzhen Key Lab of Semiconductor Lasers, The Chinese University of Hong Kong, Shenzhen, Guangdong 518172, China
2. School of Physics and Optoelectronic Engineering, Yangtze University, Jingzhou, Hubei 434023, China
3. Department of Optics and Optical Engineering, University of Science and Technology of China, Hefei, Anhui 230026, China
4. Southern University of Science and Technology, Shenzhen, Guangdong 518055, China