1. Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore 637371 Singapore
2. Center 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. NUSNNI‐NanoCore National University of Singapore Singapore 117411 Singapore
5. NUS Graduate School for Integrative Science and Engineering National University of Singapore Singapore 117456 Singapore
6. Natural Sciences and Science Education National Institute of Education Nanyang Technological University Singapore 637616 Singapore
7. Department of Physics National University of Singapore Singapore 117542 Singapore
8. Department of Electrical and Computer Engineering National University of Singapore Singapore 117583 Singapore
9. Department of Materials Science and Engineering National University of Singapore Singapore 117575 Singapore