1. Department of Photonics, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan, ROC
2. Department of Biomedical Engineering, Da-Yeh University, Changhua 51591, Taiwan, ROC
3. Taiwan Semiconductor Research Institute (TSRI), National Applied Research Laboratories, Hsinchu 30091, Taiwan, ROC
4. Graduate Institute of Precision Engineering, National Chung Hsing University, Taichung 402, Taiwan, ROC
5. Thin Film Physics Division, Department of Physics, Chemistry, and Biology, Linköping University, Linköping 58183, Sweden
6. Institute of Electronics, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan, ROC