1. Photonic Innovations Lab Department of Electronic & Electrical Engineering University College London Torrington Place London WC1E 7JE UK
2. Division of Biomaterials and Tissue Engineering UCL Eastman Dental Institute Royal Free Campus University College London Pond Street London NW3 2QG UK
3. Department of Microbial Diseases UCL Eastman Dental Institute Royal Free Campus University College London Rowland Hill Street London NW3 2PF UK
4. Nanoengineered Systems Laboratory Department of Mechanical Engineering University College London Torrington Place London WC1E 7JE UK
5. Wellcome/EPSRC Centre for Interventional and Surgical Sciences (WEISS) University College London London W1W 7TS UK
6. Department of Chemistry University College London 20 Gordon Street London WC1H 0AJ UK