1. Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
2. Laser Biomedical Research Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
3. Department of Physics, The Hong Kong University of Science and Technology, Hong Kong, 999077, China
4. Department of Physics, National Taiwan University, Taipei 106, Taiwan, Republic of China
5. Department of Biomedical Engineering, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, 999077, China
6. Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States