1. Advanced
Research Center for Optics, Shandong University, Jinan 250100, China
2. State
Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
3. State
Key Laboratory of Mining Disaster Prevention and Control Co-founded
by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, China
4. College
of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China