1. Department of Physics, Faculty of Science, National University of Singapore, 2 Science Drive 3, Singapore 117542, National University of Singapore Nanoscience and Nanotechnology Initiative (NUSNNI), 2 Science Drive 3, Singapore 117542, Department of Chemistry, Faculty of Science, National University of Singapore, 3 Science Drive 3, Singapore 117543, Division of Physics and Applied Physics, Nanyang Technological University, 1 Nanyang Walk, Block 5, Singapore 637616, and Division of Bioengineering &...