1. Institute of Photonics Technologies, National Tsing Hua University, Hsinchu 30013, Taiwan
2. Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei 10607, Taiwan
3. Artilux Inc., Zhubei City, Hsinchu 30288, Taiwan
4. National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
5. Department of Electrical Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan
6. College of Semiconductor Research, National Tsing Hua University, Hsinchu 30013, Taiwan