1. College of Electronics and Information Engineering Shenzhen University Shenzhen 518060 China
2. College of Mechatronics and Control Engineering Shenzhen University Shenzhen 518060 China
3. 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