1. Department
of Physics, National Dong Hwa University, Hualien 97401, Taiwan
2. Institute
of Photonics and Optoelectronics, National Taiwan University, Taipei 10617, Taiwan
3. Department
of Dermatology, National Taiwan University Hospital and College of
Medicine, National Taiwan University, Taipei 10002, Taiwan
4. Department
of Material Science and Engineering, National Cheng Kung University, Tainan 70101, Taiwan