1. Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
2. College of Electronics and Information Engineering, Shenzhen University, Shenzhen 518060, China
3. School of Science and Engineering, Chinese University of Hong Kong, Shenzhen, Shenzhen 518172, China
4. College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China