Affiliation: | 1. Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu 300, Taiwan;2. Opto-Electronics & Systems Laboratories, Industrial Technology Research Institute (ITRI), Hsinchu 310, Taiwan;3. Nano Technology Research Center, ITRI, Hsinchu 310, Tawian;4. Institute of Physics, Academia Sinica, Taipei , Taiwan, ROC |