1. Department of Electronics Engineering and Institute of Electronics, National Yang Ming Chiao Tung University, Hsinchu, Taiwan
2. Center of Crystal Research and the Department of Physics, National Sun Yat-sen University, Kaohsiung, Taiwan
3. Department of Photonics, National Sun Yat-sen University, Kaohsiung, Taiwan
4. Department of Electrical Engineering, National Sun Yat-sen University, Kaohsiung, Taiwan
5. Department of Materials and Optoelectronics, National Sun Yat-sen University, Kaohsiung, Taiwan
6. Institute of Electronics Engineering, National Tsing Hua University, Hsinchu, Taiwan
7. Department of Physics, National Sun Yat-sen University, Kaohsiung, Taiwan
8. Department of Physics, Military Academy, Kaohsiung, Taiwan