* Corresponding authors

^a School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore

^b CINTRA CNRS/NTU/THALES, UMI 3288, Research Techno Plaza, 50 Nanyang Drive, Border X Block, Singapore

^c Department of Chemistry, National Taiwan University, Taipei City, Taiwan

^d School of Biomedical Engineering, The University of Sydney, Sydney, New South Wales 2006, Australia
E-mail: ken.yong@sydney.edu.au

^e The University of Sydney Nano Institute, The University of Sydney, Sydney, New South Wales 2006, Australia

^f The Biophotonics and MechanoBioengineering Lab, The University of Sydney, Sydney, New South Wales 2006, Australia