1. School of Physics, Shandong University, Jinan 250100, China
2. College of Materials Science and Engineering, Liaocheng University, Liaocheng 252059, China
3. School of Civil Engineering, Harbin Institute of Technology, Harbin 150001, China
4. Functional Materials and Acousto-Optic Instruments Institute, School of Instrumentation Science and Engineering, Harbin Institute of Technology, Harbin 150080, China