Affiliation: | Department of Electronic Engineering, De Lin Institute of Technology, Tuchen, Taipei County, Taiwan, 23646, R.O.C.; Department of Physics, National Taiwan University, Taipei, Taiwan, R.O.C.; Department of Physics, National Taiwan Normal University, Taipei, Taiwan, R.O.C.; Institute of Optoelectronic Sciences, National Taiwan Ocean University, Keelung, Taiwan, R.O.C. |