1. T. J. Watson Laboratory
of Applied Physics, California Institute of Technology, 1200 East California Boulevard, Pasadena, California 91125, United States
2. Samsung Advanced Institute of Technology, Samsung Electronics, Yeongtong-gu, Suwon-si, Gyeonggi-do 443-803, South Korea
3. Advanced Image Research Lab, Samsung Electronics, 2 North Lake Avenue, Pasadena, California 91101, United States