1. Applied Nano Technology and Science Laboratory, Department of Mechanical Engineering, KAIST, 291 Daehak-ro, Yusong-Gu, Daejeon 305-701, Korea
2. Laser Thermal Laboratory, Department of Mechanical Engineering, University of California, Berkeley, California 94720-1740, United States
3. Department of Mechanical Engineering and Materials Science, Thermodynamics and Sustainable Energy Laboratory, Duke University, 303 Hudson Hall, Durham, North Carolina 27708-0300, United States