1. Department
of Materials Science
and Engineering, National Chiao Tung University, Number 1001, University Road, Hsinchu, Taiwan 30010, R.O.C.
2. Department of Electrical Engineering, National Central University, Number 300, Jhongda Road,
Jhongli, Taoyuan, Taiwan 32001, R.O.C.
3. Institute of Photonics and Optoelectronics, National Taiwan University, Number 1, Sec. 4, Roosevelt
Road, Taipei, Taiwan 10617, R.O.C.
4. Nanotechnology Research Center, Industrial Technology Institute (ITRI), Chutung, Hsinchu,
Taiwan 31040, R.O.C.