1. Department of Chemical Engineering; National Cheng Kung University; Tainan 70101 Taiwan
2. Department of Engineering and System Science; National Tsing-Hua University; Hsinchu 30013 Taiwan
3. Department of Photonics; National Cheng Kung University; Tainan 70101 Taiwan
4. Advanced Optoelectronic Technology Center; National Cheng Kung University; Tainan 70101 Taiwan
5. National Synchrotron Radiation Research Center; Hsinchu 30076 Taiwan