1. Advanced Institute of Convergence Technology, Seoul National University, Suwon-si 16229, Republic of Korea
2. Center for THz-Driven Biomedical Systems, Department of Physics and Astronomy, Institute of Applied Physics, College of Natural Sciences, Seoul National University, Seoul-si 08826, Republic of Korea
3. Seoul-Teracom, Inc., Advanced Institute of Convergence Technology, Suwon-si 16229, Republic of Korea
4. School of Electronics Engineering, Kyonggi University, Suwon-si 16227, Republic of Korea