1. Research Center
for Applied Science, Academia Sinica, 128 Academia Road, Sec. 2, Nangang, Taipei 115, Taiwan (R.O.C.)
2. Department of Electronic Engineering, Chang Gung University, No. 259, Wenhua First Road, Guishan
District, Taoyuan City 33302, Taiwan (R.O.C.)
3. Department
of Physics, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 106, Taiwan (R.O.C.)
4. College of Engineering, Chang Gung University, No.
259, Wenhua First Road, Guishan District, Taoyuan City 33302, Taiwan (R.O.C.)
5. Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan (R.O.C.)