1 Department of Physics, National Taiwan Normal University, Taipei, 11677, Taiwan. ycchao@ntnu.edu.tw.
2 Department of Physics and Center for Nanotechnology, Chung Yuan Christian University, Chung-Li, 32023, Taiwan.
3 Department of Biomedical Engineering and Center for Biomedical Technology, Chung Yuan Christian University, Chung-Li, 32023, Taiwan.
4 Department of Biomedical Engineering and Center for Biomedical Technology, Chung Yuan Christian University, Chung-Li, 32023, Taiwan. chengan_lin@cycu.edu.tw.