1. Reality Device Research Division, Electronics and Telecommunications Research Institute (ETRI), Daejeon 34129, Republic of Korea
2. Department of Physics and Research Institute for Basic Sciences, Kyung Hee University, Seoul 02447, Republic of Korea
3. School of Materials Science and Engineering, Chonnam National University, Gwangju 61186, Republic of Korea
4. Department of Creative Convergence Engineering, Hanbat National University, Daejeon 34158, Republic of Korea
5. Hanwha Techwin R&D Center, Seongnam 13488, Republic of Korea