1. Sensor System Research Center; Korea Institute of Science and Technology; Seoul 02792 Republic of Korea
2. Department of Physics and Astronomy and Center for Atom Scale Electromagnetism; Seoul National University; Seoul 08826 Republic of Korea
3. Materials Architecturing Research Center; Korea Institute of Science and Technology; 5, Hwarang-ro 14-gil, Seongbuk-gu Seoul 02792 Republic of Korea
4. Nanomaterials Science and Engineering; University of Science and Technology; 217, Gajung-ro Yuseong-gu Daejeon 34113 Republic of Korea
5. Department of Physics; Incheon National University; Incheon 22012 Republic of Korea
6. Department of Materials Science and Engineering, and A. J. Drexel Nanomaterials Institute; Drexel University; 3141 Chestnut St. Philadelphia PA 19104 USA
7. KU-KIST Graduate School of Converging Science and Technology; Korea University; Anam-ro 145 Seongbuk-gu Seoul 02841 Republic of Korea