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 637371 Singapore
3. Functional Materials and Microsystems Research Group and the Micro Nano Research Facility RMIT University Melbourne VIC 3000 Australia
4. Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China Chengdu 610054 China
5. ARC Centre of Excellence for Transformative Meta‐Optical Systems RMIT University Melbourne VIC 3000 Australia
6. Biomedical Engineering Department College of Engineering Imam Abdulrahman Bin Faisal University Dammam 34212 Saudi Arabia
7. Centre for Photonic Metamaterials & Optoelectronics Research Centre Zepler Institute University of Southampton Southampton SO17 1BJ UK