1. Optoelectronics Research Centre and Centre for Photonic Metamaterials, University of Southampton, Southampton SO17 1BJ, United Kingdom
2. Frontier Core Technology Laboratories, Fujifilm Corporation, 577 Ushijima Kaisei-machi, Ashigarakami-gun, Kanagawa 258-8577, Japan
3. QinetiQ Ltd., Cody Technology Park, Farnborough, Hampshire GU14 0LX, United Kingdom
4. Centre for Disruptive Photonic Technologies, School of Physical and Applied Sciences and The Photonics Institute, Nanyang Technological University, Singapore 637371