1. Center for Opto-Electronic Materials and Devices; Korea Institute of Science and Technology; Seoul 136-791 Republic of Korea
2. Nanomaterials Science and Engineering; Korea University of Science and Technology; Daejeon 305-350 Republic of Korea
3. Department of Optical Engineering; Rose-Hulman Institute of Technology; 5500 Wabash Avenue Terre Haute IN 47803 USA
4. School of Electrical and Computer Engineering; Faculty of Engineering; University of Seoul; Seoul 130-743 Republic of Korea