1. Department of Physics and Nanoscience, Sun Moon University, 70, Sunmoon-ro 221, Tangjeong-myeon, Asan-si, Chungcheongnam-do 31460, South Korea
2. Department of Optometry, Eulji University, 553, Sanseong-daero, Sujeong-gu, Seongnam-si,
Gyeonggi-do 13135, South Korea