1. Centre for OptoElectronics and Biophotonics, School of Electrical and Electronic Engineering & The Photonic Institute, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
2. Singapore Institute
of Manufacturing Technology, 2 Fusionopolis
Way, Singapore 138634, Singapore
3. School
of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore
4. School
of Electronic and Electrical Engineering, University of Leeds, Leeds LS2 9JT, United Kingdom