1. Department of Photonics, National Sun Yat-sen University, Kaohsiung, Taiwan
2. Department of Applied Science, R.O.C. Naval Academy, Kaohsiung, Taiwan
3. Department of Physics, Center of Crystal Research, National Sun Yat-sen University, Kaohsiung, Taiwan
4. Department of Physics, National Sun Yat-sen University, Kaohsiung, Taiwan
5. Department of Electronics Engineering, National Chiao Tung University, Hsinchu, Taiwan
6. Department of Materials and Optoelectronic Science, National Sun Yat-sen University, Kaohsiung, Taiwan