1. School of Physics and Optoelectronics; School of Materials Science and Engineering; Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques; Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices; State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China
2. Department of Electrical and Electronic Engineering, The University of Hong Kong, Hong Kong 999077, China
3. School of Physics and Telecommunication Engineering; Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials; Guangdong Engineering Technology Research Center of Efficient Green Energy and Environmental Protection Materials; Guangdong-Hong Kong Joint Laboratory of Quantum Matter, South China Normal University, Guangzhou 510006, China
4. School of Applied Physics and Materials, Wuyi University, Jiangmen 529000, China