1. Institute of Manufacturing Technology and Department of Mechanical Engineering, National Taipei University of Technology, Taipei, Taiwan
2. Department of Physics, National Chung Cheng University, Chiayi, Taiwan
3. Department of Applied Physics, Tunghai University, Taichung, Taiwan
4. Department of Physics, Fu Jen Catholic University, Taipei, Taiwan
5. Department of Mechanical Engineering, Ming Chi University of Technology, New Taipei City, Taiwan