1. Shandong Key Laboratory of Optical Communication Science and Technology
2. School of Physics Science & Information Technology
3. Liaocheng University
4. Liaocheng 252059
5. China
6. School of Opto-Electronic Information Science and Technology
7. Yantai University
8. Yantai 264005
9. Heilongjiang Province Key Laboratory of Superhard Materials
10. Physics Department
11. Mudanjiang Normal University
12. Mudanjiang 157012
13. Department of Geological Sciences
14. Stanford University
15. Stanford
16. USA