Affiliation: | 1. Sungkyunkwan Advanced Institute of Nanotechnology (SAINT) and Department of Physics, Sungkyunkwan University, Cheun-cheun-dong 300, Suwon 440-746, Republic of Korea;2. Sungkyunkwan Advanced Institute of Nanotechnology (SAINT) and School of Information and Communication Engineering, Sungkyunkwan University, Suwon 440-746, Republic of Korea;3. Korea Research Institute of Standards and Science, Daejeon 305-340, Republic of Korea |