1. Division of Physics and Applied PhysicsSchool of Physical and Mathematical SciencesNanyang Technological University Singapore 637371 Singapore
2. Centre for Disruptive Photonic TechnologiesThe Photonics InstituteNanyang Technological University Singapore 637371 Singapore
3. School of Electrical and Electronic EngineeringNanyang Technological University Singapore 639798 Singapore
4. CINTRA CNRS/NTU/THALESUMI 3288Research Techno PlazaNanyang Technological University 50 Nanyang Drive Singapore 637553 Singapore
5. Biomedical Institute for Global Health Research and TechnologyNational University of Singapore Singapore 117599 Singapore
6. Department of PhysicsCase Western Reserve University 10600 Euclid Avenue Cleveland OH 44106 USA
7. Singapore University of Technology and Design 8 Somapah Road Singapore 487372 Singapore
8. Department of Biomedical EngineeringNational University of Singapore Singapore 117583 Singapore
9. Department of Physics and CNR‐NANOTEC UOS of CosenzaLicryl LaboratoryUniversity of Calabria 87036 Rende Italy