1. Department of Physics
2. National Cheng Kung University
3. Tainan 701
4. Taiwan
5. Advanced Optoelectronic Technology Center
6. National Synchrotron Radiation Research Center
7. Hsinchu 300
8. Materials and Electro-Optic Research Division
9. National Chung-Shan Institute of Science and Technology
10. Taoyuan 325
11. Department of Electrophysics
12. National Chiao Tung University
13. Graduate Institute of Applied Physics
14. National Chengchi University
15. Taipei 116
16. School of Materials Science and Engineering
17. Anhui Provincial Key Laboratory of Advanced Functional Materials and Devices
18. Hefei University of Technology
19. Hefei 230009
20. People's Republic of China