1. National Institute
of Standards and Technology Physical Measurement Laboratory, Gaithersburg, Maryland 20899, United States
2. Shenzhen
Key Laboratory of Biomedical Engineering, School of Medicine, Shenzhen University, 3688 Nanhai Road, Shenzhen 508060, China
3. Department
of Chemical Engineering, Columbia University New York, New York 10027, United States
4. Department
of Physics, Virginia Commonwealth University, Richmond, Virginia 23284, United States
5. Department
of Applied Physics Applied Mathematics, Columbia University New York, New York 10027, United States