1School of Physics and Electronic Information, Huaibei Normal University, Huaibei 235000, China
2Laboratory of Nanophotonic Functional Materials and Devices, School of Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, China
3Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, South China University of Technology, Guangzhou 510640, China
4School of Life Sciences, Huaibei Normal University, Huaibei 235000, China
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