1. School of Optical and Electronic Information
2. Huazhong University of Science and Technology
3. Wuhan 430074
4. P. R. China
5. College of Materials Science and Engineering
6. State Key Laboratory of Material Processing and Die and Mould Technology
7. School of Materials Science and Engineering
8. The University of New South Wales
9. New South Wales 2052
10. Australia
11. School of Materials Science
12. Technical University of Darmstadt
13. Darmstadt 64287
14. Germany
15. School of Physics