1. Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore 637371 Singapore
2. Centre for Disruptive Photonic Technologies The Photonics Institute Nanyang Technological University Singapore 639798 Singapore
3. Institute of Microelectronics Agency for Science, Technology and Research 2 Fusionopolis Way Singapore 138634 Singapore
4. Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China Chengdu 610054 China
5. Ioffe Institute St Petersburg 194021 Russia
6. ITMO University St Petersburg 197101 Russia