1. Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States
2. Nanophotonics Research Center, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea
3. Laboratory of Bio-Optical Imaging, Singapore Bioimaging Consortium (SBIC), Agency for Science, Technology and Research (A*STAR), Singapore 138667, Singapore
4. Singapore Heavy Engineering Pte. Ltd., Singapore 536562, Singapore
5. Department of Electrical and Computer Engineering, Boston University, Boston, Massachusetts 02215, United States
6. College of Biotechnology, Misr University of Science and Technology, Giza, Egypt