1. National Dong Hwa University, Department of Opto-Electronic Engineering, Hualien 97401, Taiwan
2. National Dong Hwa University, Department of Opto-Electronic Engineering, Hualien 97401, TaiwanbResearch Center for Applied Sciences, Academia Sinica, Taipei 11529, Taiwan
3. Instrument Technology Research Center, National Applied Research Laboratories, Hsinchu 30076, Taiwan
4. National Central University, Graduate Institute of Environmental Engineering, Taoyuan 32001, Taiwan
5. Research Center for Applied Sciences, Academia Sinica, Taipei 11529, TaiwaneNational Taiwan University, Department of Physics, Taipei 10617, Taiwan